CN1066594C - Correcting system for long-distance video cable transmission - Google Patents

Correcting system for long-distance video cable transmission Download PDF

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CN1066594C
CN1066594C CN95115443A CN95115443A CN1066594C CN 1066594 C CN1066594 C CN 1066594C CN 95115443 A CN95115443 A CN 95115443A CN 95115443 A CN95115443 A CN 95115443A CN 1066594 C CN1066594 C CN 1066594C
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amplifier
output
intermediate frequency
input
transmission
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CN1146104A (en
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沈来沛
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Abstract

The present invention belongs to the field of television video transmission, which mainly solves the problems of frequency distortion, amplitude attenuation, common-mode interference, instruction distortion, etc. which are generated after videos are transmitted by electric wires or electric cables for a long distance. The present invention has the main technical characteristic that a series of unit circuits are invented and are used for manufacturing various products, and different correction systems are formed by the products. Compared with the prior art, the input and output dynamic range, the high and medium frequency compensation range and the common-mode interference and parasitic oscillation inhibiting capacity of the system are greatly expanded, and a transmission instruction is restored and relayed. The present invention is suitable for a plurality of transmission line modes, and consequently, the present invention has the advantages of good correction characteristic and long correction distance.

Description

Correcting system for long-distance video cable transmission
The invention belongs to the television video transmission field, particularly pass through electric wire (single-core shielding line, twin-core shielding conductor, twin cable, twisted-pair feeder, multi beam twisted-pair feeder, ordinary telephone line about video ... Deng) or the caused amplitude fading of the long Distance Transmission of vision cable, the category that the correction of frequency, phase distortion and common mode disturbances suppress.
Along with the continuous development of TV applications, the real-time long Distance Transmission of TV signal is more and more general, yet expensive vision cable (United States Patent (USP) 4.984.079) is used in existing transmission technology or requirement; Or expensive optical cable and photoelectricity and electro-optical transforming device are used in requirement; Or require to transmit and extra modulation and demodulation equipment by expensive cable with the method for high frequency modulated and demodulation; Or requiring with the transformer coupled common mode disturbances that suppresses---this causes low-frequency distortion easily and high frequency response is degenerated; Or require with multiple power supply (United States Patent (USP) 4.984.079); Can only be applicable to that maybe cable transmits or certain electric wire transmits; Or what adopt is existing custom circuit, and the narrow dynamic range of its high frequency compensation compensates discontinuously, and easily produces parasitic oscillation; The narrow dynamic range that common mode disturbances suppresses; Inter-stage adopts AC coupled more, the AC coupled during Low ESR particularly, its low-frequency distortion big (Denmark's product).Peaking network is arranged in the source electrode loop of transistorized emitter-base bandgap grading or field-effect transistor more, capacitive load in these emitter-base bandgap gradings (or source electrode) loop may produce parasitic oscillation introducing dynatron effect on some frequency in its base stage (or gate pole) loop, and when frequency is very high, voltage in emitter-base bandgap grading (or source electrode) loop on the building-out capacitor have little time to suddenly change and can big high frequency negative (just) amplitude of oscillation season NPN transistor and N slot field-effect transistor (or PNP transistor and P-channel field-effect transistor (PEFT) transistor) the EB knot or the door source between of short duration ending, therefore the frequency of sort circuit high frequency compensation can not be too high, every grade compensation rate can not be too big, increase the possibility that compensation progression can cause signal to noise ratio to descend and cause parasitic oscillation, also can increase low-frequency distortion, thereby the distance limited (United States Patent (USP) 4.984.079 and Denmark's product) of transmission.What have can only step-typely jump over compensation, and the switch class is limited, lacks careful continuous adjusting, compensates more coarse (Denmark's product); Have can only be high, the intermediate frequency compensation regulates simultaneously, lacks independent regulation separately, is difficult to accomplish that height, intermediate frequency can both compensate to optimum state (United States Patent (USP) 4.984.079).Some vision cable adjusters that domestic manufacturer produces also all have some above-mentioned weakness, and great majority only are applicable to a kind of transmission means---and cable load mode (United States Patent (USP) 4.984.079 and most of home products) or twisted-pair feeder load mode (Denmark's product) are difficult to satisfy multiple different requirement.
In addition, all do not find the refile part of instruction in these calibration equipments.
The objective of the invention is to propose the multiple technologies scheme at the problem that exists in the background technology, and many special circuits have been invented at these technical schemes, develop multiple selective product in conjunction with different application scenarios and environmental factor, make every kind of product in the environment of appointment, be operated in optimum state, proofread and correct and the effective transmitting range longer than prior art with the best that obtains the transmission in real time of the long distance of vision signal.Wherein
A. the transmission corrective system of unbalance voltage input and output
Native system is more suitable for the transmission system of cable or single-core shielding line, also can be used for transmission systems such as twisted-pair feeder, two parallel lines, multi beam twisted-pair feeder and ordinary telephone line.
B. balanced voltage transmits corrective system
Native system is most appropriate to transmission systems such as two parallel lines, twisted-pair feeder, multi beam twisted-pair feeder, ordinary telephone line.It also can be used in cable or the single-core shielding line transmission system in order to suppress excessive common mode disturbances, and this is because balance transmission has strong common mode disturbances to suppress ability.
C. unsymmetrical current transmits corrective system
Native system is most appropriate to transmission systems such as single-core shielding line, two parallel lines, twisted-pair feeder, also is suitable for cable and multi beam twisted pair system.
D. balanced balanced current transmission system
Native system is most appropriate to transmission systems such as two parallel lines, twisted-pair feeder, multi beam twisted-pair feeder
In addition, because many application scenarios, except transmission video signal itself, may also need transmit the address code of signal source position, to the control code of the more on-site optional equipment control usefulness of signal source, and some information codes that the on-site certain situation of signal source turned back to control centre.These coded signals may distort, be disturbed in growing apart from transport process, and they are also needed to restore correction.There is no this additional function in the existing video transmission calibration equipment, the present invention then includes it in one, and along with the correction of vision signal, these addresses, control, information code also are subjected to shaping and correction in the lump.
As for the goal of the invention of each physical circuit, because of involving a wide range of knowledge, inconvenience is listed one by one at this, intends being placed in the circuit description of technical scheme appropriate section and is narrated, and is more convenient for like this understanding.
The present invention is directed to the more existing problems of background technology and invented some special circuits, constitute multiple different technical scheme according to these special circuits, and make dissimilar products by these schemes, to use the different situations of polytype transmission line in the adaptive video long haul transmission system, make them can both obtain best correcting feature.
Owing to solve the same problem that exists in the background technology multiple scheme and circuit can be arranged, also because some circuit may be again one of part of multiple scheme, for convenience's sake, the invention of each element circuit among we first classification declaration the present invention, and then narration is with the feature and the application of technical scheme of these different element circuits compositions and products thereof.
(1). high, intermediate frequency compensated amplifier class
4. video line according to claim 2, cable transmission corrective system is characterized in that: export dc point and fix and have the high, medium and low frequency inequality attenuation type height of rated voltage gain, intermediate frequency compensated amplifier (Fig. 1 b) by wide input dynamic range (E-V Be-V Oes) out-put dynamic range (E-V Oes) complementation feedback pair amplifier (1) and by height, intermediate frequency compensating network (2), tracking potentiometer (R V1), divider resistance R ' 2, R " 2The attenuator of forming is formed; When
R 2=R ' 2* R " 2/ (R ' 2+ R " 2) and the big multiple of the voltage of amplifier be
A=(R V1+ R 2)/R 2The time, then the total voltage multiplication factor of the low frequency of output point (O) (or not compensation) is 1, when selecting R ' 2, R " 2Resistance when the static direct current working point of output point (O) is equated with the static direct current working point of input (I), this amplifier also cascades up with multistage direct coupling, make the low-frequency voltage multiplication factor remain 1, and the voltage amplification factor high, that intermediate frequency compensates is because of height, intermediate frequency compensating network (2) and tracking potentiometer (R V1) shunt compensation regulate effect and multiply each other step by step and increase progressively, the linear zone that makes amplifier be operated in maximum dynamic range forever equally can obtain big height, intermediate frequency compensation and not introduce low-frequency distortion.
5. according to the said video line of claim 2, cable transmission corrective system, it is characterized in that: trans-impedance amplifier type height, intermediate frequency compensated amplifier (Fig. 2) are by compensating network (2), gain-adjusted network (3), tracking potentiometer (R V1), feedback network (4), wide electric current input dynamic range (can by design alternative), wide voltage out-put dynamic range (E-V Be)---when only as height, intermediate frequency compensated amplifier, or (E-2V Be) trans-impedance amplifier (5) of---also being also used as when recommending the output drive level when both amplifying as high, intermediate frequency compensation---forms, trans-impedance amplifier (5) is looked gain-adjusted network (3), tracking potentiometer (R in the voltage dynamic range of input point 1 V1), current transfer resistance (R Ot) and the ginseng scope of feedback network (4), significantly high, intermediate frequency symmetrical drive characteristic; The input point of trans-impedance amplifier (6) is the virtual earth point, complementary current transfer resistance (R Ot) in the electric current that flows through be steady state value, signal source is by gain-adjusted network (3), height, intermediate frequency compensating network (2), tracking potentiometer (R V1) and output equal complementary current transfer resistance (R by the electric current sum that feedback network (4) injects virtual earth point (6) Ot) in electric current, when the electric current of signal source end injection increases, the electric current that is injected by feedback network (4) then equivalent reduces complementaryly, to keep the current constant in the complementary current transfer resistance, vice versa, so just the high intermediate frequency compensating signal electric current undamped ground complementation that tracking potentiometer parallel effect produces being transferred on the feedback network (4) by high intermediate frequency compensating network (2), that is translate into signal voltage by signal code, because zero-decrement current transfer makes this height, intermediate frequency compensation that high signal to noise ratio be arranged.
6. according to the said video line of claim 2, cable transmission corrective system, it is characterized in that: image electric current source type stride resistance amplifying type height, intermediate frequency compensated amplifier have positive facies pattern (Fig. 3 a) and the branch of anti-phase type (Fig. 3 b), they are all by gain-adjusted network (3). height, intermediate frequency compensating network (2), tracking potentiometer (R V1), current offset resistance (R 3) feedback network (7) and image electric current source type trans-impedance amplifier (8) composition; Its difference is gain-adjusted network (3), height, intermediate frequency compensating network (2) and tracking potentiometer (R V1) be connected on the plus or minus input of amplifier (8) respectively, thereby one of the polarity of output signal is homophase, one is anti-phase, during with facies pattern, signal source is by gain-adjusted network (3), height, intermediate frequency compensating network (2), tracking potentiometer (R V1) the parallel connection combination electric current variation of injecting positive input terminal can cause that thereby the electric current of the mirror image electrodeposit feedback network (7) of negative input end does the variation of equivalent, to obtain the variation of output voltage, because undamped, it has very high signal to noise ratio; When anti-phase, the bias current of positive input is constant, thereby the negative input end electric current in image electric current source also should be constant; Signal source is by gain network (3), height, intermediate frequency compensating network (2), tracking potentiometer (R V1) the parallel connection combination electric current that injects negative input end change, can only cause that electric current is done complementary variation in the feedback network (7), because their sums equal the constant image electric current value of negative terminal, so just transfer on the feedback network (7) injecting the signal code complementation, to obtain reversed phase output voltage, the complementary transfer of electric current also is zero-decrement, so very high signal-to-noise ratio is arranged, the out-put dynamic range of amplifier (8) is (E-2V).
7. according to claim 3,4,5, or 6 said video line, cable transmission corrective system, it is characterized in that: height, intermediate frequency compensating network (2) be one by resistance, electric capacity, the series-parallel network that inductance and potentiometer and multidigit bidirectional switch are formed, frequency range of subnetwork compensation of every bit switch control, its compensate component is regulated by corresponding potentiometer in the network and is decided, whether this frequency range needs to compensate then leading to by switch, disconnected deciding, the compensation of a plurality of segmented networks has determined total compensation passband, and the compensation rate of whole passband is then by the outer tracking potentiometer (R of network V1) regulate, it can be from the acyclic homologically trioial to the maximum, and they are all outside the ring of amplifier, unfettered, parameter can freely be selected, and not in the emitter-base bandgap grading or source electrode loop of amplifier, be difficult for causing unsteadiness and parasitic oscillation, so high, the intermediate frequency compensation rate can be much bigger far beyond prior art; Peaking network (2) and tracking potentiometer (R V1) adjusting do not change the dc point of input and output; When controlling the break-make of n subnetwork with the n bit switch, the whole network that these subnetworks constitute has 2 nPlant integrated mode, add potentiometer and tracking potentiometer (R in each subnetwork V1) adjusting, and multi-stage cascade makes the frequency bandwidth of whole network building out, the size of compensation rate, the uniformity of compensation, and is all much superior than prior art, thereby all can obtain satisfied compensation in the shortest longest distance scope of various transmission lines.
8. according to claim 5 or 6 described video electric wires, cable transmission corrective system, it is characterized in that: gain-adjusted network (3) is when regulating each Amplifier Gain with it, do not change the dc point of input and output, thereby stride resistance formula height, intermediate frequency compensated amplifier (Fig. 2), image electric current source type is striden resistance formula height, intermediate frequency compensated amplifier (Fig. 3 a, Fig. 3 b all can be designed to the identical multistage direct coupling each other of input and output dc point, overall gain and height, the height that the intermediate frequency compensating gain is adjustable respectively, the compensated amplifier that the intermediate frequency cascade is doubly taken advantage of, its signal is undamped, very high signal to noise ratio is arranged, very wide height is arranged, the intermediate frequency compensation range.
9. according to claim 2 or 5 described video lines, cable transmission corrective system, it is characterized in that: electric current amplifies height, intermediate frequency compensated amplifier (Fig. 4) except that the complete characteristic that trans-impedance amplifier formula height, intermediate frequency compensated amplifier (Fig. 2) are arranged, also has a current output terminal, it also is used as the transmitter of current imbalance transmission or the current driver in the repeater except as high, intermediate frequency compensation.
10. according to claim 2 or 5 described video lines, cable transmission corrective system, it is characterized in that: with the height of two trans-impedance amplifiers compositions, intermediate frequency compensation amplification and balance are recommended the exciter (Fig. 8) of output and are made up of the two-stage trans-impedance amplifier, its prime is to have replaced trans-impedance amplifier formula height with the form of recommending output except trans-impedance amplifier (13), non-push-pull trans-impedance amplifier in the intermediate frequency compensated amplifier and outer, all the other are identical, so except it stronger load symmetrical drive ability is arranged and, have trans-impedance amplifier formula height, the complete characteristic of intermediate frequency compensated amplifier (2); The difference public affairs of post-amplifier and pre-amplifier have been to cancel height, intermediate frequency compensating network (2) and the tracking potentiometer (R in the pre-amplifier input circuit V1), it only plays the effect of anti-phase amplification, and the common balance of forming of the output of it and prime is recommended output driver, and gain-adjusted network (3) is adjusted to the complementary fully symmetry of output of two arms; Voltage dynamic range (the E-V of two output arms Oes-2V Be), the symmetry of high frequency pumping is significantly arranged well, it is mainly as balance of voltage transmission exciter, and its single armed output also can be made Voltage unbalance transmission exciter.
11. video line according to claim 2, cable transmission corrective system is characterized in that: the balanced differential input is complementary feeds back formula balance push-pull oscillator (Fig. 5) by constant-current source (Q 4, Q 5), differential input stage (Q 2, Q 3), a public grade feedback network (2), the feedback resistance (R of penetrating f), and complementary feedback pair amplifier compositions such as (10), the dynamic range of input and output arm is (E-3V Be); Adopt complementary feedback to have good height, intermediate frequency to follow the tracks of characteristic, thereby the symmetrical drive characteristic of fabulous high significantly, intermediate frequency is arranged the push-pull output stage of formula loopful feedback; The symmetry of difference input circuit makes its every arm be similar to (E-3V Be) the ability of anti-common mode disturbances; The adjusting of feedback network (2) does not influence the dc point of input and output, and the amplifier perseverance is operated in the best linear dynamic range, and this amplifier both can have been made sending-end voltage balance transmission exciter, also can be used as the receiver of balance or uneven transmission usefulness.
12. video line according to claim 2, cable transmission corrective system is characterized in that: can imbalance or balance input trans-impedance amplifier formula balance push-pull oscillator (Fig. 6) by current source (Q 4, Q 5), differential amplifier (Q 2, Q 3), feedback network (2), stride resistance push-pull oscillator (11) and feedback network (4) composition, it has (E-3V Be) the input and output dynamic range; Be similar to (E-3V Be) the ability of anti-common mode disturbances, the adjusting of feedback network (2) does not influence the input and output dc point; Strong high significantly, intermediate frequency symmetrical drive ability; This amplifier both can have been made the exciter of balance of voltage transmission usefulness, also can make the input stage of the receiver of balance or unbalance voltage transmission usefulness.
13. video line, cable transmission corrective system according to claim 2 is addressed is characterized in that: complementary difference input trans-impedance amplifier formula balance push-pull oscillator (Fig. 7), by complementary differential amplifier (Q 6, Q 7), feedback network (2), complementary symmetry stride resistance output amplifier (11,12) and feedback network (4) form, complementary differential type input trans-impedance amplifier formula balance push-pull oscillator (Fig. 7), except adopting single power supply, their "+", "-", input is an arrangement of mirrors image current source.The input of Fig. 3 a and output homophase, its "+" input also has by gain-adjusted network 3 except the fixed current biasing of power supply E by R3, height, intermediate frequency compensating network 2 and height, intermediate frequency compensation tracking potentiometer R V1, the signal code that injects, their variation will cause that the electric current in the feedback network 7 makes corresponding equivalent and change, thereby cause the homophase amplification.Wherein network 2, network 3 reach R V1Effect and Fig. 2 in identical, do not repeat them here.
The difference of Fig. 3 b and Fig. 3 a is network 2, network 3 and R V1No longer be connected on "+" defeated people loop of amplifier 8, but insert its "-" defeated people loop.At this moment "+" injection current of input circuit is the fixed current that power supply E injects through R3, thereby the injection current of "-" input also should be fixed. Network 2,3 and R V1The variation of injecting signal code can only cause that feedback network 7 electric currents do complementary anti-phase variation and absorb this variable-current, thereby is anti-phase at the output and the input of amplifier.Wherein, network 2,3 and R V1Effect identical with Fig. 2 still.
Be not difficult to find out that from Fig. 3 and Fig. 3 b if we are merged into an amplifier to Fig. 3 a and Fig. 3 b, i.e. two inputs of "+" "-" of amplifier 8 arm is access network 2,3 and R all V1, then it becomes a mirror current source type with difference current input and strides resistance formula amplifier.
The dynamic range of amplifier 8 is only lacked 2 volts i.e. (E-2V) than power supply, and "+" "-" input is as long as suitably design, and positive and negative both direction all has very big dynamic range, and this is with view network 2,3, R V1Comprehensive parameters and decide.
This high intermediate frequency compensated amplifier except having homophase, anti-phase and three types of difference and, their other characteristics are consistent with the trans-impedance amplifier of (1) .b joint, in fact they also belong to the trans-impedance amplifier category, thereby with the aforementioned resistance circuit of striding same characteristic and effect are arranged.
Most element circuit inventions among the present invention all have the high frequency compensation characteristic, but because their prior purposes are other categories, are narrated so list in other classifications.
(2). long line length cable top or relaying are with the transmitter of electric current or voltage drive
Vision signal is after overlength electric wire or cable transmission, because the influence of line, cable distribution parameter, at the height, several decay of intermediate frequency composition of the terminal vision signal of transmission totally, signal amplitude also can reduce widely, and interference that the external world and adjacent passages transmit on also may responding in long Distance Transmission and the low-frequency disturbance introduced through earth-return etc., these disturb almost all is that form with common mode disturbances occurs.Its characteristic impedance in effective passband of good vision cable can be thought more constant, for reducing the reflection that they produce at transmission terminal, can precision resistance mate and realize, yet when transmitting with common long line, their characteristic impedance is coarse, will be with the line footpath, the dielectric characteristic, distance between centers of tracks closes on the influence of line or external object, the difference of environmental condition ... or the like factor and changing.
Single, the twin-core shielding conductor, two parallel lines, twisted-pair feeder, though the characteristic impedance of transmission lines such as multi beam twisted-pair feeder is accurate like that not as vision cable, but also be substantially invariable, also can accomplish basic coupling as long as insert the build-out resistor of individual features impedance at the input/output terminal of transmission line, in addition, electromagnetic wave is at the light velocity propagation of free space with 300,000 kilometer per seconds, propagation velocity in long line and cable also slowly not many, the reflection that causes because of not matching, the main radio-frequency component that influences, after the long Distance Transmission of vision signal, several decay of high fdrequency component totally, after impedance is mated substantially, volume reflection reduces more, and the extraneous common mode disturbances of introducing then can translate into balance to the unbalanced signal source and recommend signal source output and transmit, and curbs with the circuit with common mode inhibition characteristic.
In order to promote amplitude output signal and preemphasis height, intermediate-freuqncy signal composition, all require these amplifiers under the condition of given power supply, wide as far as possible dynamic range is arranged, and the amplifier of those excitation balanced transmission lines is also answered tool two output counter-jib characteristics---the symmetry of characteristic after the high frequency preemphasis particularly.Long line or long cable all are the loads that distribution parameters such as distributed resistance, inductance, electric capacity are arranged, because very long these loads of line are very heavy.When the symmetry of excitation when bad, cause radio-frequency component positive-negative half-cycle asymmetric of preemphasis in the output signal probably, therefore output should be the low-impedance complementary output level of wide dynamic range.The more used circuit of current device, its dynamic range is too narrow, and very difficult realization is significantly high, the intermediate frequency preemphasis, and pumping signal is at high frequency significantly the time, and the symmetry in the positive-negative half-cycle is poor, makes that will to recover good signal at receiving terminal very difficult.
The present invention for solve the above problem that exists and proposed some new-type circuit and division as follows:
A. the complementary feedback of balanced differential input is to formula balance push-pull oscillator
Fig. 5 is that the complementary feedback of balanced differential input is to formula balance push-pull oscillator.It is by constant-current source Q 4, Q 5Differential input stage Q 2, Q 3Public grade feedback network 2, the feedback resistance R of penetrating fAnd complementary feedback pair amplifier 10 compositions such as grade.The difference that the dynamic range of each input arm is about supply voltage source E and 3 EB junction voltages is (E-3V Be), the dynamic range of whole output arm also is (E-3V Be).
As seen from Figure 5, this two arm is a symmetry fully on the structure, and complementary feedback pair amplifier and whole amplifier constitute the loopful negative feedback, high, intermediate frequency there is extraordinary tracking characteristics, network 2 has common characteristic with all networks of addressing 2 of front, it is except herein in feedback loop, have outside the characteristic of the gain that determines height, medium and low frequency, it also is adjustable high, intermediate frequency compensation (lifting) network, just be in penetrating in grade loop of loop at this network, its circuit is suitably simplified, the also corresponding minimizing of compensation rate.
What complementary feedback pair amplifier adopted is the export structure form of recommending, the common Compositional balance push-pull output stage of two arms, and they have very strong symmetrical drive ability to balanced transmission line.
This amplifier has good symmetry, Q 2, Q 3The level of penetrating separately constant-current source Q is arranged 4, Q 5, this makes it that very strong common mode repellant properties be arranged, and adds big input dynamic range, therefore can suppress common mode disturbances on a large scale.
Feedback network 2 is in Q 2, Q 3The public level of penetrating, can design to such an extent that regulate feedback network and when changing the height, intermediate frequency compensation rate of amplifier and overall gain, not change the input and output dc point, thereby the amplifier perseverance is worked in the best dynamic range.
This amplifier both can be used as the exciting circuit of balance transmission transmitting terminal, also can be used as the output exciting circuit of repeater, also can be used as the receiving circuit of balance transmission receiving terminal.
The input and output dynamic range that this amplifier is wide, high common horizontal suppression characteristic, fabulous high frequency tracking characteristics, the good circuit and the symmetry of excitation are that available circuit is incomparable.
This amplifier can be made up of separating component, also can be designed to thick, thin film circuit, can also make integrated circuit for large-scale popularization.
B. can imbalance or the balanced differential input, trans-impedance amplifier formula balance is recommended the amplifier of output.
But Fig. 6 be both can uneven also balanced differences fraction input trans-impedance amplifier formula balance recommend the amplifier of output.It is by constant-current source Q 4, Q 5, differential amplifier Q 2, Q 3, the public compositions such as a grade feedback compensation network 2, trans-impedance amplifier 11, feedback network 4 of penetrating.It has the input dynamic range of only tying than low about 3 EB of supply power voltage E is (E-3V Be), and same out-put dynamic range.Compensating network 2 is similar to the compensating network of aforementioned same mark, and just because it is in the emitter-base bandgap grading loop, and the main purpose of this amplifier is to amplify pumping signal but not high frequency compensation, thereby network will be simplified some.Radio-frequency component in its compensating signal is also determining the high, medium and low frequency gain of amplifier.Change parameter scalable high frequency compensation amount and the gain of high, medium and low frequency in the network 2, and do not change output input dc point.
Amplifier 11 and network 4 etc. are striden resistance formula push-pull output circuit common the composition, it has the symmetry of good positive and negative signal excitation and wide dynamic range, be suitable for encouraging very much balanced transmission line, therefore its balance of both having can be used as after the middle and high frequency preemphasis of top transmitter is recommended output driver, also can make the output stage de-energisation balanced transmission line in the trunking.Also can make the receiver of balance or non-equilibrium transmission.
The good symmetry that amplifier is intrinsic has very wide common mode inhibition scope and big common mode inhibition factor during the balanced differential input, therefore except that the exciter of making balanced transmission line, also can make receiver, just at this moment circuit can be simplified, and can cancel an output arm, and need not to recommend output.
Its wide dynamic range, high common mode inhibition scope, good excitation waveform symmetry obviously are better than available circuit.
This amplifier also can be used as the input stage of the anti-common mode disturbances of uneven transmission receiving terminal, and with the common mode disturbances that suppresses to exist in the uneven transmission, can cancel one of them output arm this moment.
This amplifier can be made of separating component, also can make thick, thin film circuit, also is easy to be designed to integrated circuit.
The input circuit of c. complementary difference input trans-impedance amplifier formula balance push-pull oscillator Fig. 7 amplifier is complementary differential type, and it is by two complementary transistor Q o, Q 7Be composed in series, its emitter current is identical with collector current.The trans-impedance amplifier 11 and 12 of the input utmost point and two output arms all is complementary symmetry.The high, medium and low frequency gain of the network 2 decision amplifiers in the public emitter-base bandgap grading loop, it and aforesaid all-network 2 have similar characteristic.Input and output (the E-3V that all has an appointment Be) dynamic range.Output stage is that balance is recommended output, so the heavy burden of the long line of balance is loaded with good symmetrical drive effect.
Because two complementary output arms are relatively independent, when the uneven output of need, can cancel a wherein arm, so just become the amplifier of the uneven output of balanced differential input.Therefore it both can be used as the exciter of the long line of balance of the output of transmitting terminal or repeater, also can make the receiver of the long line receiving terminal of balance, also can make non-balanced transmission line, the receiver of the anti-common mode disturbances of cable, this is because its difference input pattern has the ability of anti-common mode disturbances too.
Q among Fig. 7 7The ground level input also can exchange ground connection, this amplifier also can make uneven input like this, the amplifier of balance or uneven output.
It has saved two constant source flowing transistors owing to adopt complementary input form, and used components and parts are economized than other circuit.
It has the numerous characteristics in the aforementioned circuit equally, is better than existing homogeneous circuit.
This circuit also can be designed to thick, thin film circuit or integrated circuit except available separating component is formed.
D. the balanced excitation amplifier of forming with two trans-impedance amplifier formula push-pull output stages
Fig. 8 recommends the output drive amplifier by the balance that two trans-impedance amplifier formula push-pull output stages are formed.It is by height, intermediate frequency compensating network 2, gain-adjusted network 3, height, intermediate frequency compensation tracking potentiometer R V1, complementary current transfer resistance R Ot, feedback network 4, stride the pre-amplifier that resistance push-pull oscillator 13 is formed, and by gain-adjusted network 3, complementary current transfer resistance R with height, intermediate frequency compensation Ot, feedback network 4, stride the amplifier that the common imbalance input that constitutes of post-amplifier that resistance push-pull oscillator 13 forms and balance are recommended strong high, the intermediate frequency compensation of output band.
The input dynamic range of pre-amplifier has intimate ± E, and the independently passive network high, that intermediate frequency compensates usefulness is not in ring, therefore it can obtain extremely wide height, intermediate frequency compensation range, and final stage is the trans-impedance amplifier level of an adjustable gain, is easy to be transferred to the output balance of two arms.It and prime have (E-3V Be) extremely wide out-put dynamic range, and recommend output, long line heavy burden is loaded with very strong fillip, be well suited for the long line exciter of the balance of making transmitting terminal.Its single output also can be made the exciter of non-balanced transmission line.Because itself has very strong height, intermediate frequency compensation ability, its height, intermediate frequency pre-emphasis characteristic help increasing line, the distance of the long Distance Transmission of cable.
It also can make the output driver of balancedunbalanced transmission trunking device except the transmitting terminal exciter that can do balance or unbalanced line, cable transmission, also can make the uneven output driver of receiving terminal.
The input and output dynamic range that this circuit is wide, extremely wide height, intermediate frequency compensation dynamic range, balance is recommended the drive characteristic of output, adjustable equilibrium response, circuit simply be available circuit can not be equal to.
The still available separating component of this circuit, mode such as thick, thin film circuit and integrated circuit is made.
E. current amplifier type
Fig. 4 is height, the intermediate frequency compensated amplifier that has current amplifier type and trans-impedance amplifier type two specific characters concurrently, the difference of it and Fig. 2 only is that the former output is voltage output, and the existing voltage output end of the latter, also has current output terminal, it can also directly export the current driver of doing in transmitting terminal or the repeater with the form of current excitation except that the over-all properties with Fig. 2.
When we knew the signal long-distance transmissions, the many patterns with voltage of external interference occurred, during therefore with the long Distance Transmission signal of electric current, be subjected to external interference to influence meeting littler.During this foreign minister's line transmission, the distributed capacitance of long line is one of key factor that influences frequency response, when the high fdrequency component of signal changes with voltage form, voltage on the distributed capacitance can not suddenly change, and makes the big high attenuation of high fdrequency component, and when using current delivery, if receiving terminal is the virtual earth point, then have only the variation of electric current on the acceptance point, no-voltage variation, distributed capacitance will reduce widely to the influence of high fdrequency component.Therefore, the long Distance Transmission vision signal of form with current excitation is attractive.
Yet there are no similar report in the existing technology.
Same this amplifier is easy to use separating component, and thick, thin film circuit or integrated circuit are realized.
F. balanced balanced current output amplifier (balance mutual conductance output amplifier)
Long interference apart from the introducing of current transfer ratio voltage transmission is little, but when long line is very long, the equivalent lumped parameter of its distributed resistance and inductance also is considerable, and they still can produce extra interference signal because of the pressure drop that extraneous induced signal or earth-return signal etc. produce thereon.But these interference signals almost are to occur with the form of common mode disturbances, therefore at the output current excitation long line of transmitting terminal with balance, then with the reception amplifier reception with difference current input, can suppress these common mode disturbances at receiving terminal.
Fig. 9 has provided difference (or uneven---when an input arm exchanges ground connection) amplifier 14 of voltage input balanced balanced current output and the balanced balanced current output amplifier that feedback peaking network 2 is formed thereof, because it is input as voltage, be output as electric current so claim trsanscondutance amplifier again.The every arm of difference input arm of this amplifier all has (E-3V Be) dynamic range, its pressure drop that is output as that electric current produces on the input virtual earth point of receiving terminal is 0, so the restriction of no-output voltage dynamic range.
This amplifier has wide input voltage dynamic range, the wide current excitation ability of appropriate high frequency compensation (strong high frequency compensation amplifier is introduced in its front still can obtain extremely strong high frequency preemphasis ability) itself, during the length Distance Transmission, the ability of anti-High-frequency Interference, the ability of anti-common mode disturbances, the current excitation source when being suitable for making balance transmission line length Distance Transmission very much.
Do not see similar report in the existing technology as yet.
This circuit both can realize with separating component, also can realize with the mode of thick, thin film circuit or integrated circuit.
(3). long line length cable transmission terminal curtage receiver class
After the long Distance Transmission of vision signal process electric wire, can cause amplitude fading undoubtedly, high intermediate frequency composition loss also can be introduced some interference in the transmission course.For signal is recovered, must increase overall amplitude, the high intermediate frequency composition that compensation has been lost is proofreaied and correct low-frequency distortion, suppresses external interference.
The main task of the receiving terminal first order is to the coupling of transmission line and transmission means and inhibition common mode disturbances, and next is only overall amplification and compensation high, intermediate frequency, and both tasks of back more will be finished by subsequent conditioning circuit.
The existing circuit that suppresses common mode disturbances all is to adopt conventional differential voltage amplifier, yet often its input dynamic range is too narrow, the common mode disturbances amplitude that can suppress is lower, thereby perhaps need consume more power with higher supply power voltage, also reduce the reliability of circuit for suppressing big common mode disturbances.
The serial circuit that the present invention proposes. wide common mode inhibition dynamic range not only is provided, also signal has been had enough amplifications and high frequency compensation ability.Modern division is as follows:
A. the complementary feedback of balanced differential input is to formula balance push-pull oscillator
Referring to (2) .a joint and Fig. 5.
B. balanced differential is imported trans-impedance amplifier formula output type
Referring to (2) .b joint and Fig. 6.
C. complementary difference input trans-impedance amplifier formula output type
Referring to (2) .c joint and Fig. 7.
D. trans-impedance amplifier type electric current receiver
When transmitting vision signal by line, cable with the form of electric current, receiving terminal also should receive with electric current input type amplifier.
Figure 10 is the receiver of unsymmetrical current transmission.It is by trans-impedance amplifier 5, feedback network 4 and complementary current transfer resistance R OtThe common composition, power by single supply E.6 is the virtual earth point among the figure, flows through complementary current transfer resistance R OtIn electric current be constant, the electric current sum in input current and the feedback network is a constant, is complementary between them, when one increased, another then reduced, vice versa.So just the mode of input current with complementation is transferred in the feedback network, thereby obtains the variation of output voltage at the output of amplifier 5.So just the current signal of input having been converted to voltage signal handles for subsequent conditioning circuit.
This amplifier be input as electric current, be always 0 at the signal voltage of virtual earth point 6, but signal code is not 0, so the voltage dynamic range of this amplifier is unrestricted.Restricted is the electric current dynamic range of input, and this can obtain satisfied result by the selection of largest current change scope that transmitting terminal is sent and receiving terminal circuit parameter.Voltage out-put dynamic range (the E-2V of this amplifier Be) be very wide.
Also similarly do not report in the prior art.
This circuit is easy to realize with separating component, also can make thick, thin film circuit and integrated circuit.
E. resistance formula output type electric current receiver is striden in the difference current input
When vision signal with current forms during along the transmission of long line length cable, though the acceptance point at receiving terminal is a virtual earth, but transmission line itself has distribution parameters such as resistance, inductance, electric capacity, also may introduce extraneous a small amount of induced voltage or current signal, in order to suppress these parasitic signals better, the signal code transmitting terminal has adopted Fig. 9 and the described balanced balanced current output amplifier of (2) .f, and receiving terminal correspondingly then need adopt difference current input shown in Figure 11 to stride resistance formula output type electric current receiver.This amplifier is by constant-current source Q 4, Q 5, difference amplifier tube Q 2, Q 3, compositions such as high frequency compensation feedback network 2, amplifier 5, feedback network 4, difference input trans-impedance amplifier 15.
Amplifier 5, feedback network 4, complementary current transfer resistance R OtThe common trans-impedance amplifier of forming, its input is the virtual earth point, signal code will be by complementary current transfer resistance R OtComplementally be transferred in the feedback network 4, produce the signal voltage that has amplified at the output of amplifier 5, will obtain the voltage of differential type to the input of differential signal electric current at the output of striding the resistance input amplifier, they are delivered to by Q 2, Q 3, Q 4, Q 5The input of the differential amplifier of forming, and this difference mode signal amplified, and, be added in Q for the electric current of common-mode signals such as interference 2, Q 3Ground level also will be common mode voltage signal, it will disappear mutually because of the common mode inhibition effect, the difference input that difference mode signal is formed via amplifier 15, feedback network 4 is again striden further amplification of resistance formula amplifier and is formed unbalanced voltage output, for the further processing of further part circuit.
This amplifier has very wide electric current input dynamic range and output voltage dynamic range (E-2V Be), common mode current there is the good restraining effect, feedback network 2 has suitable high frequency compensation and gain-adjusted effect, does not influence the dc point of output when regulating gain, is the well balanced receiver of signal code balance transmission.Do not see in the prior art similar report is arranged.Its available separating component constitutes, and also can be made into thick, thin film circuit or integrated circuit.
F. this balanced balanced current receiver when also being the balanced balanced current transmission of difference current input loopful feedback trans-impedance amplifier output type receiver. Q among Figure 12 4, Q 5Constitute constant-current source, Q 2, Q 3Constitute differential amplifier, its emitter-base bandgap grading is connected to high frequency compensation feedback network 2, the complementary transfer resistance R of amplifier 16,17, feedback network 18 and electric current OtWith Q 2, Q 3Stride resistance formula amplifier Deng common composition, and constitute two input and output arms of amplifier.Every arm of this amplifier all is a loopful feedback, thereby extraordinary stability and high frequency tracking characteristics are arranged, and the dynamic range of good anti-common mode disturbances ability and wide anti-common mode disturbances, and its reason is consistent with the circuit of Figure 11.It also can be as the electric current receiver of signal code balance transmission terminal.
This circuit can be formed with separating component, can be made into thick, thin film circuit or integrated circuit.
(4). receiving terminal output-stage circuit class:
For balance transmission, the input and output of its trunking should be balances also, have only the output stage of receiving terminal need enter the intermediate treatment or the terminal equipment of TV.Be to need to transmit undoubtedly at this moment with unbalanced cable, thereby the terminal output amplifier complementation feedback that should adopt wide dynamic range, broadband, high linear, Low ESR output is to formula amplifier or the complementary feedback push-pull oscillator to formula, also or with trans-impedance amplifier type height, intermediate frequency compensation push-pull oscillator (Fig. 2) or two trans-impedance amplifier formulas recommend the height of output, an arm of intermediate frequency compensated amplifier (Fig. 8) is exported the output-stage circuit of making receiving terminal.
For non-equilibrium transmission, the long Distance Transmission calibration equipment of this electric wire itself both can be made receiving equipment, also can make trunking usefulness, and it need not the transmitting apparatus work of all can establishing one's own system.At this moment, the output circuit of this equipment both may be connected with the intermediate treatment or the terminal equipment of TV, also may encourage long line of follow-up transmission or cable as repeater, thereby it must use the push-pull oscillator of complementary feedback to formula, even make capacitive load when high frequency significantly, the output impedance of its positive-negative half-cycle is still identical, the asymmetry of unlikely introducing high frequency.
Relevant complementary feedback to or complementary feedback to the formula push-pull oscillator owing to relate to the other problem, intend being applied for as separate case simultaneously, do not give unnecessary details at this.
(5) composition of product and system
(1), by the mode of functional classification the more used element circuits of each product in the system has been done comprehensive elaboration in (2), (3), (4) joint, to illustrate how to form different products with the form of block diagram now, and form different corrective systems with different products with these element circuits.
Because single twin-core shielding conductor, two parallel lines, twisted-pair feeder, multi beam twisted-pair feeder etc. are on the same group between transmission line, distance between transmission line and screen is constant basically, its dielectric also is a commaterial, they also have the nominal attribute impedance of oneself separately, though it is accurate like that to be not so good as vision cable, but the scrambling that does not have the such characteristic impedance of two random separated wires, as long as the top at transmission line inserts the build-out resistor identical with its characteristic impedance with terminal, still can prevent the reflection of stop signal.In addition, be used for general narrow than radio and television and high definition TV of passband of the video signal source of supervisory control system, electromagnetic wave is 30 * 10 in the propagation velocity of free space 4Km, propagation velocity in transmission lines such as cable or wire also slowly not what, again Chang transmission line with respect to the light velocity and Yan Yeshi moment i.e. mistake, reflection remaining in transmission line is only obvious to high-frequency signal, and vision signal is after the transmission of transmission line middle and long distance, high frequency is almost decayed totally, and signal amplitude also can decay widely, has more reduced the influence of remaining reflection.
Two parallel lines of non-shielding, twisted-pair feeder and multi beam twisted-pair feeder, they have higher characteristic impedance than shielding conductor and cable, and the heart yearn of the same same thickness of length is little by the signal amplitude decay that self copper group causes, can allow signal transmit farther distance.
Non-shielding conductor is subject to the defective of outside electromagnetic interference, because these interference all occur with the form of common mode disturbances, the inhibition circuit of its available anti-common mode disturbances curbs it.
Electric wire is with respect to the price advantage of cable, the advantage of non-shielding conductor transmission range, particularly include the advantage with the unified wiring system of shared multi beam twisted-pair feeder such as communication computer network in, make TV monitor system with electric wire replace most of cable become may and necessary.
A big TV monitor system comprises a plurality of signal sources of being made up of some video cameras and auxiliary device thereof, it sends the signal of vision signal and alarm code one class, the terminal equipment that these signals will be sent to selection, supervision, control, handle, and the terminal equipment of monitoring also need send address and control code signal and sends to the signal source end of appropriate address and decipher and control.
Distance when between signal source end and control terminal more in short-term, can directly connect with electric wire or cable between them, when its when increasing, the high intermediate frequency response of vision signal can degenerate because of long Distance Transmission, amplitude also can decay widely, also can introduce interference, two-way coded signal also can become and be difficult to identification, for this reason with the increase of distance, need to add successively betwixt receiver, or transmitter adds receiver, or transmitter adds repeater and add receiver, or transmitter adds a plurality of repeaters and adds receiver, interference is suppressed, frequency and phase place to vision signal are carried out the relay compensation, signal amplitude is carried out relay amplify, and coded signal is carried out the relay shaping proofread and correct.
As shown in figure 22, signal source 28 is delivered to transmitter 29 to vision signal and alarm code class signal through electric wire or cable, at this vision signal is carried out impedance matching, buffering, high intermediate frequency preemphasis compensation and power amplification, and with the characteristic impedance of transmission line output, be sent to repeater 30 or 33 by electric wire or cable, in repeater, the transmission of video signals line is carried out impedance matching, common mode disturbances suppresses, after high intermediate frequency compensation and signal amplitude amplification and the final stage power amplification, characteristic impedance output with follow-up transmission line, and be sent to receiver 31 or 33 by the respective transmissions line, and receiver carries out impedance matching to the vision signal that repeater is sent here, and common mode disturbances suppresses, after high intermediate frequency compensation amplification and signal power are amplified, with characteristic impedance output, be sent to terminal by the respective transmissions line, select and processing for terminal.The alarm code signal that may exist in the signal source 28 is sent to transmitter 29 by electric wire, after its shaping is handled by electric wire with the optical coupled switch device in the form de-energisation repeater 30 or 33 of current excitation, after its shaping again by electric wire with the optical coupled switch device in the form de-energisation receiver 31 or 33 of electric current, after its shaping by electric wire with the optical coupled switch in the form de-energisation terminal 32 of electric current, after its shaping, handle for terminal equipment.Address that terminal equipment 32 sends and control code still are sent to receiver 31 or 33 by electric wire successively with the mode of electric current exciting light coupling switch, repeater 30 or 33, transmitter 29 carries out the relay shaping and transmits in the signal source 28, and deciphers identification and control in signal source.
Transmitter, repeater and receiver all have the balance of voltage and current or imbalance to transmit four types, and the type of their mixed transport also can be arranged.
Figure 13 is a balance transmission with the block diagram of transmitter, by the vision signal of signal source 28 through characteristic impedance R 0Be sent to buffer 19 after the coupling termination, after its buffering, be sent to high intermediate frequency preemphasis compensation and amplifier 20, to promote the high intermediate frequency composition in the signal, be sent to output drive level 21 then, this is the drive(r) stage that a balance is recommended output, and it has current balance type to recommend output and the balance of voltage is recommended the branch of output.
Since transmitter 29 general with signal source 28 from must be very near, signal quality is fine, high, intermediate frequency preemphasis compensation rate is little, general output drive level also has certain high intermediate frequency compensation amplifying power, and these amplifiers often also have buffer capacity, sometimes may be buffer 19, high, intermediate frequency compensated amplifier 20 and output drive level 21 are combined into a circuit, for example for balance of voltage output with transmitter can with shown in Figure 6 can imbalance or balanced differential import trans-impedance amplifier formula balance push-pull oscillator, complementary difference input trans-impedance amplifier formula balance push-pull oscillator shown in Figure 7, any is served as in the amplifier that high intermediate frequency compensation that two trans-impedance amplifier formulas of usefulness shown in Figure 8 push-pull output stage is formed and balance are recommended output drive; Output then realizes with balanced balanced current output amplifier shown in Figure 9 with transmitter for current balance type.
Figure 14 is the block diagram of balance transmission with repeater 31, the vision signal of being sent here through electric wire or cable by transmitter 29 or preposition repeater is sent to balanced balanced current or voltage input amplifier 23, deliver to height, intermediate frequency compensated amplifier 20 through terminating resistance impedance matching, common mode disturbances inhibition, height, intermediate frequency compensation again after amplifying, further carry out height, intermediate frequency compensation and amplification, be sent to balance that output drive level 21 carries out voltage or electric current afterwards and recommend output and amplify, and connect the characteristic impedance output of transmission line later on.
Balanced voltage input amplifier 23, the complementary feedback of balanced differential input of available Fig. 5 is to formula balance push-pull oscillator.Fig. 6's can imbalance or balanced differential input trans-impedance amplifier formula balance push-pull oscillator, and one of circuit such as complementary difference input trans-impedance amplifier formula balance push-pull oscillator shown in Figure 7 are formed.
High, 20 high, medium and low frequency inequality attenuation type height, intermediate frequency compensated amplifier, adjustable or fixing amplifiers of its output dc point that the extra voltage gain can be arranged by Fig. 1 a or Fig. 1 b of intermediate frequency compensated amplifier, Fig. 2 strides resistance type height, intermediate frequency compensated amplifier, and the homophase of Fig. 3 a or Fig. 3 b or anti-phase image electric current source are striden in resistance formula height, the intermediate frequency compensated amplifier any one or more single or its direct-coupled cascade amplifier and formed.
Balanced balanced current input amplifier 23 can be used the combiner circuit of Fig. 3 a and Fig. 3 b, that is all insert compensating network 2 simultaneously at positive and negative two inputs of amplifier 8, the combiner circuit of the combinational network in parallel of adjustable potentiometer RV1 and gain-adjusted network 3, resistance formula output type electric current receiver is imported, striden to difference current shown in Figure 11, any composition in the difference current input loopful feedback trans-impedance amplifier output type receiver shown in Figure 12.
Balance transmission is consistent with the exciter 21 of voltage or electric current and transmitter, repeats no more.
For example, the balanced balanced current transmission uses the combiner circuit of Fig. 3 a and Fig. 3 b as balanced balanced current input amplifier 23 with an embodiment of repeater, insert the terminating build-out resistor in its front, this circuit has the ability of the anti-common mode disturbances that exceeds voltage supplied, can suppress strong common mode disturbances, two input arms all are connected to the outer height of ring, the intermediate frequency compensating network, can stepping connect adjusting height in the wide region, intermediate frequency compensation not causing unsteadiness and parasitic oscillation, its output can be directly high with conduct, Fig. 3 a of intermediate frequency compensated amplifier or Fig. 3 b which couple, they have outer high intermediate frequency compensating network of ring and corresponding characteristic equally, directly low-frequency distortion is not introduced in coupling, its gain and compensated regulation do not influence dc point yet, if input stage 23 and height, intermediate frequency compensated amplifier 20 total m levels, every grade has the switch combination of n group network again, and then its total number of combinations will have 2 M * nKind.The balanced balanced current output amplifier as Fig. 9 as the output drive level then is sent in the output of high intermediate frequency compensated amplifier 20, and with characteristic impedance output de-energisation corresponding subsequent transmission line.
Figure 15 is the block diagram of balance transmission with receiver.The vision signal of sending here through transmission line by signal source 28, transmitter 29 or repeater 30, through balanced voltage or 23 impedance matchings of electric current input amplifier, common mode disturbances suppress, high, intermediate frequency compensation is sent to the further compensation and amplifying of height, intermediate frequency compensated amplifier 20 after amplifying, be sent to uneven push-pull oscillator 24 then, the de-energisation transmission line is exported in characteristic impedance with follow-up transmission line after its power amplification.
Balance transmission only is that with the difference of receiver and repeater the output drive circuit has been changed over the voltage or the current driver 24 of uneven transmission by balanced voltage or current driver 21.
Uneven transmission can adopt complementary feedback to the formula push-pull oscillator with voltage exciter 24.
Uneven transmission is adopted the electric current of Fig. 4 to amplify with 24 of current drivers or is striden the electric current output arm that hinders the high intermediate frequency compensated amplifier of scale-up version, or input of the imbalance of balanced balanced current output amplifier shown in Figure 9 and single armed output services state.
Figure 19 is the block diagram of Voltage unbalance transmission with adjuster, vision signal is sent into common mode inhibition amplifier 27, through its impedance matching, common mode inhibition and, be sent to height, intermediate frequency compensated amplifier 20 after amplifying, be sent to complementary feedback after high, intermediate frequency compensates and amplifies to formula push-pull oscillator 24, it and balanced voltage transmission do not have too big difference with receiver.Because be uneven transmission, transmitter, repeater and receiver do not have much difference yet,, can be used as repeater or receiver again so it both can be used as the transmitter of unbalance voltage transmission usefulness.But need not use transmitter in this case often.
Figure 16 is the block diagram of current imbalance transmission with transmitter, and the vision signal that signal source 28 is sent here is through R 0Impedance matching is sent to height, the compensation of intermediate frequency preemphasis and current delivery type amplifier 25 and is carried out compensation of high frequency preemphasis and electric current amplification after buffer 19 bufferings, and with the follow-up transmission line of characteristic impedance output de-energisation.The electric current of Fig. 4 amplifies or the single armed of striding the balanced balanced current output amplifier of the resistance high intermediate frequency compensated amplifier of scale-up version and current driver or Fig. 9 is simplified circuit and all be can be used as height, the compensation of intermediate frequency preemphasis and current-output type amplifier 23, they itself also have cushioning effect, can make 19 and 25 to merge.
Figure 17 is the block diagram of unsymmetrical current transmission with repeater, its electric current receiver 26, the signal excitation electric current that acceptance is sent here through transmission line by transmitter or preposition repeater, after amplifying, it is sent to high intermediate frequency compensated amplifier 20, carry out the compensation of high intermediate frequency and amplify, be sent to high intermediate frequency preemphasis compensation and current-output type amplifier afterwards and compensate once more and amplify the back with the follow-up transmission line of characteristic impedance output de-energisation.
Electric current receiver 26, available Fig. 2, Fig. 3 a, Fig. 3 b, Fig. 4 or Figure 10 circuit are formed.
Figure 18 is the unsymmetrical current transmission block diagram with receiver, and it is formula push-pull oscillator 24 has been replaced the high intermediate frequency preemphasis among the latter to compensate and the current-output type amplifier with complementary the feedback with the difference of repeater.
In fact the output in the balanced balanced current transmission receiver of Figure 15 is unbalanced, and itself both can be used as the receiver of balanced balanced current transmission usefulness, also can be used as transmitter, repeater and the receiver of unsymmetrical current transmission usefulness.The same with the unbalance voltage transmission, owing to be uneven transmission, the unsymmetrical current transmission is often also omitted with transmitter need not.
Coded signal treatment circuit 22 is all arranged in all transmitters, repeater, the receiver, address and control code signal that they are accepted to be derived from the alarm code signal of signal source and are derived from terminal, and after light-coupled isolation shaping switch shaping is separately proofreaied and correct, the alarm code signal is along signal source, transmitter, repeater, receiver, the terminal direction transmits, decipher control and processing in terminal; Address and control code then transmit along the direction of terminal, receiver, repeater, transmitter, signal source, decipher in signal source, discern and control.
From technical scheme one chapter,, and can be clear that by the explanation of the multiple systems of these product composition to the invention of a series of element circuits among the present invention and a series of products of forming by these element circuits:
(1). the present invention proposes multiple height, intermediate frequency compensated amplifier---see 4. (1) .a, b, c joint for details, they all have the input and output dynamic range wideer than prior art; The selection of high more freely, intermediate frequency compensating network parameter; Bigger height, intermediate frequency compensation rate; More symmetrical height, the intermediate frequency compensation characteristic; Wideer compensation frequency band range; More careful and uniform frequency compensated regulation; More combination of network form; Can multistage direct coupling platform cascade compensation, increase height, intermediate frequency compensation rate rapidly with the form of multiplying each other and do not change the amplifier dc point; More stable mode of operation---be difficult for producing parasitic oscillation; More reliable and stable compensation can be obtained with compensating circuit progression still less better; Higher signal to noise ratio.The invention of circuit has all been considered both can be also thick for make in the future with the separating component composition at present, and thin film circuit or integrated circuit lay the foundation.
(2). the present invention proposes a series of transmitters that the curtage that supplies transmission top or relaying to use encourages usefulness---see 4. (2) .A, b, c, d, e, f joint for details.They all have the input and output curtage dynamic range wideer than prior art; Better high frequency tracking characteristics; Better encourage symmetry, thereby be that better common mode disturbances suppresses to lay a good foundation; Do not influence the dc point of input and output when transferring gain and high frequency compensation, the amplifier perseverance is operated in the maximum linear dynamic range; They almost all have and both had been suitable for the exciter used as balance transmission, also suitable exciter as uneven transmission usefulness, and whether this is on the connection of circuit and simplify and decide.They also have balance, imbalance, and all multi-operation modes such as curtage are selective, and this also is not see in the prior art.
(3). the invention provides the serial receiver of the curtage of using for relaying or transmission terminal---they all have input and output voltage or the dynamic range of currents wideer than prior art to see 4. (3) .a, b, c, d, e, f for details; Wideer anti-common mode current, the dynamic range of voltage disturbance; Better common mode inhibition characteristic; When mostly being arranged, the compensation of gain of transferring and high intermediate frequency do not influence the characteristic of input and output dc point; Mostly be suitable for the reception of balance or uneven transmission.They also have electric current, voltage, balance, multiple mode of operations such as uneven reception, real non-prior art finding.
(4). the receiver output adopts also be wide input and output dynamic range, high linearity, broadband, Low ESR, high fillip the complementation feedback to or complementary the feedback to push-pull oscillator, see the file of separate case application for details.
The product that the element circuit of being addressed by (1), (2), (3), (4) constitutes has than the product of prior art:
A. the transmitter product has stronger height, intermediate frequency preemphasis ability; Bigger excitation amplitude adjusted scope and bigger maximum output swing scope; Better symmetrical drive characteristic---the symmetrical drive characteristic of high frequency preemphasized signal significantly particularly, thus can make signal on same transmission line, transmit longer distance, and unlikely high frequency excessive attenuation.Because main height, intermediate frequency preemphasis network is passive, and outside the amplifier ring, non-again emitter-base bandgap grading (or source electrode) loop that places amplifier, compensation rate therefore high, the intermediate frequency preemphasis is not only big, but also very stable, is difficult for producing parasitic oscillation.
B. the repeater product has the stronger anti-common mode current or the ability of voltage disturbance; Stronger height, intermediate frequency compensation ability; Better signal to noise ratio; Higher job stability; More succinct circuit structure---modularization, thick, thin film circuitization, integrated circuit; Stronger more symmetrical fillip, thus longer transmission line can be encouraged.
C. the receiver product has the stronger anti-common mode current or the ability of voltage disturbance; Stronger high intermediate frequency compensation ability; Better signal to noise ratio; Higher job stability; More succinct circuit structure; Better video output characteristic.
And can make us that the leeway of multiple choices is arranged in system by products such as a, b, c.For example: the individual signals source of dispersion, we can use single-core shielding line, and two parallel lines, twisted-pair feeder or vision cable transmit, and when transmitting range when not being very long, we can select the unbalance voltage transmission means for use, like this equipment and transmission line province very all.When distance increases, can get final product at the transmitter that the signal source end adds simple unbalance voltage excitation; Longer transmission range, the receiver that then can add one or more unbalance voltage transmission in the centre is made servomotor, at this moment also available unsymmetrical current transmission plan.
For a plurality of signal sources of concentrating, then to use the multi beam twisted-pair feeder, when transmission range is long as transmission line.Then be advisable, resist like this that to touch interference performance altogether stronger, increased the mutual isolation between each signal with the transmitter and the receiver that adopt balanced voltage or current delivery.When distance was longer, the centre added repeater again.
All element circuits of the present invention had both all been considered and can have been constituted with separating component.Also can make modular circuit, therefore thick film or thin film circuit, and then make integrated circuit, can expect that following design feature will more and more succinct, its stable and reliability will further improve.
All include instruction transmitted in both directions shaping relay circuit in each product of the present invention, reduced the error rate of instruction greatly.Because instruction transmits in real time, reaction is carried out immediately, does not have delay.
Fig. 1 a is high, medium and low frequency inequality attenuation type height, the intermediate frequency compensated amplifier that the extra voltage gain is arranged, and its output dc point is adjustable.
Fig. 1 b is high, medium and low frequency inequality attenuation type height, the intermediate frequency compensated amplifier that the extra voltage gain is arranged, and its output dc point is fixed.
Fig. 2 strides resistance to put civilian type height, intermediate frequency compensated amplifier.
Fig. 3 a is that resistance formula height, intermediate frequency compensated amplifier are striden in homophase image electric current source.
Fig. 3 b is that anti-phase mirror current source is striden resistance formula height, intermediate frequency compensated amplifier.
Fig. 4 is the electric current amplification or strides resistance scale-up version height, intermediate frequency compensated amplifier and current driver.
Fig. 5 is that the complementary feedback of balanced differential input is to formula balance push-pull oscillator.
Fig. 6 is can imbalance or balanced differential input trans-impedance amplifier formula balance push-pull oscillator.
Fig. 7 is complementary difference input trans-impedance amplifier formula balance push-pull oscillator.
Fig. 8 is the amplifier with the height of two trans-impedance amplifier formula push-pull output stages compositions, intermediate frequency compensation and balance push-pull drive.
Fig. 9 is the balanced balanced current output amplifier.
Figure 10 is a trans-impedance amplifier type electric current receiver.
Figure 11 is that resistance formula output type electric current receiver is striden in the difference current input.
Figure 12 is a difference current input loopful feedback trans-impedance amplifier output type receiver.
Figure 13 is the block diagram of balance transmission with transmitter.
Figure 14 is the block diagram of balance transmission with repeater.
Figure 15 is the block diagram of balance transmission with receiver.
Figure 16 is that current imbalance transmits the block diagram with transmitter.
Figure 17 is the block diagram of current imbalance transmission with repeater.
Figure 18 is the block diagram of the receiver of current imbalance transmission usefulness.
Figure 19 is the block diagram of Voltage unbalance transmission with adjuster.
Figure 20 is voltage, current balance type transmission or current imbalance transmission, the shared block diagram of system.
Figure 21 is the block diagram of Voltage unbalance transmission system.
Figure 22 is comprehensive total block diagram.
Execution mode
(1). relevant each element circuit working of an invention sees for details in technical scheme one chapter:
4.(1). a、b、c；
4.(2). a、b、c、d、e、f；
4.(3). a、b、c、d、e、f；
4.(4)：
(2). the execution mode that relevant product invention reaches the system that is made up of product sees for details in technical scheme one chapter: 4. (5) .a, b, c, d, e, f, g and corresponding thereafter set of systems become explanation, do not repeat them here.

Claims (16)

1. a correcting system for long-distance video cable transmission is made up of signal source, transmitter, repeater, receiver and terminal, it is characterized in that:
Vision signal that signal source produces and the alarm code signal that may exist are sent to transmitter;
Transmitter carries out impedance matching to the vision signal from signal source, high, intermediate frequency preemphasis compensation and power amplification and to after the coded signal relay shaping, transmission line or the cable constant by any characteristic impedance in single, double core shielding conductor, two parallel lines, the twisted-pair feeder are sent to repeater;
Repeater suppresses carry out impedance matching, common mode disturbances from the vision signal of transmitter or the preposition repeater when a plurality of repeater cascade, the compensation of high intermediate frequency and preemphasis compensation are amplified and the final stage power amplification, and, be sent to receiver by electric wire or cable to after the alarm code signal relay shaping;
Receiver is to carrying out impedance matching, common mode disturbances inhibition, height, intermediate frequency compensation amplification, final stage power amplification and monitoring being sent to terminal after the alarm code signal relay shaping from the vision signal of signal source or transmitter or repeater;
Terminal, address of sending and control code signal are then passed through the relay shaping circuit shaping in receiver, repeater and the transmitter in regular turn, and finally are sent to the signal source end for its identification, decoding and control through their mutual transmission lines;
Distance in short-term, can directly link to each other between signal source and the terminal with transmission line or cable, when distance extends gradually, can insert receiver successively betwixt, transmitter adds receiver, transmitter adds repeater and adds receiver, or transmitter adds a plurality of repeaters and add receiver, and with transmission line or cable they is coupled together;
Transmitter, repeater and receiver all have the balance of voltage or electric current or imbalance to transmit four types;
All circuit are all by single power supply in transmitter, repeater and the receiver;
2. the correcting system for long-distance video cable transmission of addressing according to claim 1, balance transmission is accepted the vision signal sent here by signal source with transmitter, and with terminal connecting resistance R 0Impedance matching, after buffer (19) buffering, be sent to high intermediate frequency compensated amplifier (20) and carry out frequency and phase compensation and amplitude amplification, be sent to output drive level (21) again and carry out power amplification, and export with the output impedance identical with transmission line characteristic impedance in the mode of balanced excitation;
Balance transmission has the electric current and the balance of voltage to transmit two types with transmitter;
The relay shaping circuit (22) of coded signal is accepted alarm code signal that is come by signal source and address and the control code signal that is come by repeater or receiver in the transmitter, respectively to after their relay shapings, the alarm code signal transmits along repeater or receiver direction, and address and control code signal transmit along signal source direction.
3. the correcting system for long-distance video cable transmission of addressing according to claim 1, the vision signal that balance transmission is sent here by transmitter or preposition repeater with repeater acceptance, be sent to further compensation and the amplitude amplification that high intermediate frequency compensated amplifier (20) carries out the frequency and the phase place of high intermediate frequency through balanced voltage or electric current input amplifier (23) impedance matching, common mode disturbances inhibition, the compensation of high intermediate frequency and after amplifying, be sent to output drive level (21) then;
The balanced voltage input amplifier adopts differential voltage input class A amplifier A, and the balanced balanced current input amplifier adopts differential electrical flow pattern or difference to stride resistance formula class A amplifier A;
Coded signal relay shaping correcting circuit (22) in the repeater is accepted alarm code signal of being sent here by transmitter or preposition repeater and address and the control code signal of being sent here by follow-up repeater or receiver, after shaping is proofreaied and correct respectively to them, the alarm code signal is sent to follow-up repeater or receiver, and address and control code signal are sent to preposition repeater or transmitter.
4. the correcting system for long-distance video cable transmission of addressing according to claim 1, the vision signal that balance transmission is sent here by preposition repeater or transmitter with receiver acceptance, through balanced voltage or electric current input amplifier (23) impedance matching, common mode disturbances suppresses, after high intermediate frequency compensation and the amplification, be sent to height, intermediate frequency compensated amplifier (20) is to frequency and further compensation and amplitude amplification of phase place, the output drive amplifier (24) that is sent to unbalanced then carries out power amplification, and with the output impedance output identical with the vision cable characteristic impedance, the output drive amplifier (24) of unbalanced can be a current mode, also can be voltage-type;
Coded signal relay shaping circuit (22) in the receiver is accepted by signal source, the alarm code signal that transmitter or repeater are sent here and address and the control code signal sent here by terminal, after shaping is proofreaied and correct respectively to them, the alarm code signal is sent to terminal and handles, and address and control code signal are sent to repeater, transmitter or signal source.
5. the video electric wire of addressing according to claim 4 is grown the Distance Transmission corrective system, when balance transmission with the input amplifier (23) of receiver and output drive level (24) when all being current mode, it can be used as transmitter, repeater or the receiver of unsymmetrical current transmission usefulness;
When input amplifier (23) and output drive level (24) when all being voltage-type, it can be used as transmitter, repeater or the receiver of unbalance voltage transmission usefulness simultaneously;
When input amplifier (23) and output driver (24) are voltage-type, one when being current mode, and then it is that the imbalance transmission of mixed type is with transmitter, repeater or receiver.
6. according to claim 2,3,4 or 5 correcting system for long-distance video cable transmission of addressing, the relay shaping circuit of coded signal is made up of the optical coupled switch device.
7. the correcting system for long-distance video cable transmission of addressing according to claim 1 includes the high intermediate frequency compensated amplifier of senior middle school's low frequency inequality attenuation type that extra voltage gains in transmitter wherein, repeater or the receiver, it is characterized in that:
The dc point of the input and output dc point of amplifier (1) and signal output point (0 point) can design in full accordly, do not influence dc point when making height, intermediate frequency compensated regulation, can multistage direct coupling not introduce low-frequency distortion to increase its amplification and compensation rate;
The combinational network and the resistance R of high intermediate frequency compensating network (2) and tracking potentiometer (RV1) 2The high, medium and low frequency inequality attenuator that constitutes outside the ring of amplifier (1), high, in, be difficult for causing parasitic oscillation when frequently compensating.
8. the correcting system for long-distance video cable transmission of addressing according to claim 1, comprising trans-impedance amplifier type height, intermediate frequency compensated amplifier be characterised in that:
Amplifier (5) is to stride resistance formula amplifier, the height, intermediate frequency compensating network (2), tracking potentiometer (RV1) and the in parallel of gain-adjusted network (3) that are connected between the virtual earth point (6) of signal input part and amplifier (5) are combined in outside the amplifier ring, but great number compensation and do not introduce parasitic oscillation;
The input and output dc point of amplifier (5) can design consistently.
9. the correcting system for long-distance video cable transmission of addressing according to claim 1, resistance formula height is striden in homophase that it comprises or anti-phase image electric current source, the intermediate frequency compensated amplifier is characterised in that:
Amplifier (8) is that image electric current source formula is striden resistance formula amplifier, by height, intermediate frequency compensating network (2), the parallel connection combination that tracking potentiometer (RV1) and gain-adjusted network (3) are formed is connected between the plus or minus input of signal input part and amplifier (8), they are all outside the amplifier ring, if this combinational network in parallel just is being connected on simultaneously, negative signal source and amplifier (8) are just, between negative two inputs, then constitute the imported trans-impedance amplifier of difference current, it is just when single power supply, the ability that the anti-common mode disturbances that exceeds supply power voltage is all arranged on the negative both direction;
The input and output dc point of amplifier can design consistently.
10. the correcting system for long-distance video cable transmission of addressing according to claim 1 or 8, electric current wherein amplify or stride the voltage output arm (V that the resistance scale-up version is striden in the existing conduct of amplifier (9) in resistance scale-up version height, intermediate frequency compensated amplifier and the current driver Out), also have electric current output arm (I as the electric current scale-up version Out).
11. according to the correcting system for long-distance video cable transmission that claim 1 is addressed, the complementary feedback of balanced differential input that comprises in its transmitter, repeater or the receiver is characterised in that formula balance push-pull oscillator:
Between each input and output arm of amplifier by transistor (Q2 or Q3), amplifier (10), feedback resistance (R F), high intermediate frequency compensation and feedback network (2) constitute a complementary feedback pair amplifier, intercouple by high intermediate frequency compensation and feedback network (2) again between them becomes the balance push-pull oscillator of a unified complementary feedback of balanced differential input to formula together, and current source (Q4 and Q5) makes two arms more symmetrical;
Balance is recommended output and is provided 2 times to the ability of out-put dynamic range.
12. according to the correcting system for long-distance video cable transmission that claim 1 is addressed, it comprises can imbalance or balanced differential input trans-impedance amplifier formula balance push-pull oscillator be characterised in that:
The level of penetrating of transistor (Q2 and Q3) provides current offset by current source (Q4 and Q5) respectively, and is coupled by high intermediate frequency compensating network (2), and when no matter making imbalance or balanced differential input, the output of its two output arm all is complementary symmetrical;
The collector electrode output arm of transistor (Q2 and Q3) is connected to by amplifier (11) respectively and is connected to feedback network (4) between its input and output to be formed and strides resistance formula amplifier;
Balance is recommended output the fillip that doubles out-put dynamic range is provided.
13. according to the correcting system for long-distance video cable transmission that claim 1 is addressed, its complementary difference input trans-impedance amplifier formula balance push-pull oscillator that comprises is characterised in that:
NPN transistor (Q6) seals in the complementary difference input amplifier of high intermediate frequency compensation feedback network (2) formation with the inter-stage of penetrating of PNP transistor (Q7), the collector electrode output arm of transistor (Q6 or Q7) is connected to the trans-impedance amplifier formula balance push-pull oscillator (11 or 12) with complementary characteristic respectively, in their input and output arm termination feedback network (4) is arranged;
When monolateral or difference was imported, its two output arm all was the complementary symmetry of balance;
Complementary serial connection type differential configuration has saved the constant biasing that transistor (Q6 and Q7) is penetrated level.
14. the correcting system for long-distance video cable transmission of addressing according to claim 1, wherein the high intermediate frequency of two trans-impedance amplifier formulas of the used usefulness of transmitter, repeater or receiver push-pull output stage composition compensates and balance push-pull drive amplifier, it is characterized in that:
The composite network in parallel and the current transfer resistance (R that are made up of peaking network (2), tracking potentiometer (RV1) and gain-adjusted network (3) are arranged in the input circuit of first group of amplifier (13) Ct), feedback network (4) tandem is in amplifier input terminal, current transfer resistance (R Ct), the other end of feedback network (4) ground connection and connect the output of amplifier (13) respectively then, the output of first group of amplifier (13) then links to each other feedback network of second group of amplifier (4) and current transfer resistance (R by gain-adjusted network (3) with the input of second group of amplifier (13) Ct) connect by first group of identical mode of amplifier;
Outer single high intermediate frequency compensation of ring and gain-adjusted network can carry out high intermediate frequency compensation and gain-adjusted to two output arms simultaneously;
Two arm differential balances recommend output, provide 2 times to the fillip of dynamic range.
15. according to the correcting system for long-distance video cable transmission that claim 1 is addressed, the balanced balanced current output amplifier that comprises in its transmitter, repeater or the receiver is characterised in that:
Amplifier (14) is the balanced balanced current output amplifier, but difference or monolateral input, built-in high intermediate frequency compensation and feedback network (2), two output arms are balance complementary current exciter.
16. according to claim 7,8,9,11,12,13,14 or 15 correcting system for long-distance video cable transmission of addressing, high intermediate frequency compensating network (2) is made up of resistance, electric capacity, inductance, potentiometer and n position on-off switch, the n bit switch has 2 nPlant combination, the compensation rate of every kind of combination again can be by the tracking potentiometer from the acyclic homologically trioial to the maximum, and when having the amplifier cascade of this network for m, its combination will increase to 2 M * nKind.
CN95115443A 1995-09-19 1995-09-19 Correcting system for long-distance video cable transmission Expired - Fee Related CN1066594C (en)

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Cited By (1)

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CN101599927B (en) * 2009-07-17 2012-08-15 威盛电子股份有限公司 High-speed serial link system

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Publication number Priority date Publication date Assignee Title
DE102010007451B3 (en) * 2010-02-10 2011-03-17 Siemens Aktiengesellschaft Push-pull amplifier for amplifying input signal to output signal, has two amplifying elements, where each amplifying element has current emitting electrode and current collecting electrode
US11043154B1 (en) 2019-12-02 2021-06-22 Tcl China Star Optoelectronics Technology Co., Ltd. Signal processing method for display panel and device using same
CN110930910B (en) * 2019-12-02 2021-07-06 Tcl华星光电技术有限公司 Method and device for processing signals in display panel

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US4984079A (en) * 1989-07-26 1991-01-08 Hughes Aircraft Company Video preamplifier circuit

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Publication number Priority date Publication date Assignee Title
US4984079A (en) * 1989-07-26 1991-01-08 Hughes Aircraft Company Video preamplifier circuit

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Publication number Priority date Publication date Assignee Title
CN101599927B (en) * 2009-07-17 2012-08-15 威盛电子股份有限公司 High-speed serial link system

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