CN1006272B - Wideband high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry - Google Patents
Wideband high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry Download PDFInfo
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- CN1006272B CN1006272B CN85101395.3A CN85101395A CN1006272B CN 1006272 B CN1006272 B CN 1006272B CN 85101395 A CN85101395 A CN 85101395A CN 1006272 B CN1006272 B CN 1006272B
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Abstract
The present invention relates to an amplifier with a broad band, high voltage and high power, which is particularly useful to telephone lines. The amplifier is provided with a back stroke converter with a capacitance energy storage element bridged on a line. A user line is characterized in that the user line has a determinate load impedor connected with a power storage capacitor of the back stroke converter in parallel. The user line is monitored by a differential amplifier which provides single-end output signifying the level added to the user line. The output and input signal likes a ring, specific relevant signals, such as a voice signal, etc., are superimposed to form an error signal as the input end of a comparator, and the other input end of the comparator is connected with a triangular reference wave.
Description
The present invention is a kind of wide-band amplifier, is particularly suitable for as the amplifier in the telephone line circuit.
In the prior art of many telephone switching systems, people's employing such as the electromechanical assembly of relay or step switch one class is realized the connection between the subscriber's line.In many these type systematics, interface between user loop or line circuit and the telephone exchange comprises an audio frequency transformer, the direct current speech current is presented to user loop by two bull windings that this primary has two serial Feedback resistance, and alternating voltage then is coupled on this line circuit by secondary winding.
Ringing voltage is produced by a common generator.This generator can be supplied with one group of user loop or subscriber's line circuit; And this generator is by an electromechanical relay and every subscriber's line which couple.This method is widely used in the converting system always; Being actually with available technology at that time is a kind of reliable circuit that the basis produces.
As everyone knows, electromechanical relay and audio frequency transformer are that people are familiar with, extremely reliably parts.As pointing out, be full of this class circuit in the prior art.Can be referring to " communication transmission system " book (BTL limited company third edition in 1964).
As known, these prior arts major defect is to use audio frequency transformer.Audio frequency transformer is bigger and heavy circuit block.Another problem that will explain is to use common ring generator.This generator also be a kind of need be than the large scale circuit parts of large space and power consumption.Along with the development of telephony, many kinds of telephone exchange model machines or telephone system have appearred, and they adopt switch technology; In such converting system, resemble this base part of relay and replaced by semiconductor device basically.Along with the progress and the extensive use of semiconductor technology, the actual size of telephone line circuit, power consumption, cost and overall performance etc. all have significantly and reduce.After this, the line circuit that is applied in the digital switching system has further realized with integrated circuit technique.Therefore, such circuit is compared with the circuit that adopts electromechanical assembly basic change has been taken place.
The improved line circuit example of this class is to authorize little R.C.W Qi Er (R.C.Wchea February 9 nineteen eighty-two, Jr) the United States Patent (USP) 4 that is entitled as " power adjustment device that supply is used for digital telephone system telephone line signal ", 315, No. 106, and transfer the assignee in this.
Another part reference is that the United States Patent (USP) that is entitled as " subscriber line interface circuit that has the impedance synthesizer " is presented to little R.C.W Qi Er (R.C.W.Chea Jr) June 74,387, No. 273 nineteen eighty-threes, and transfers the assignee in this.These patents comprise the various technology that realize line circuit in the digital switching system that are used in.
A again reference is that the United States Patent (USP) that is entitled as " programmable ringing signal generator " is presented to little R.C.W Qi Er (R.C.W Chea Jr) September 14 4,349, No. 703 nineteen eighty-twos, and transfers the assignee in this.This part patent has been described a kind of improved ringing circuit that is particularly suitable for digital switching system specially.In this circuit, the excitation of ringing circuit and release are program controlled, and prepare and other signal voltage is provided as hardware or software generation ring.This part patent also narrated a kind of need not be heavy transformer and the Digital Implementation scheme of the complete ringing circuit of other parts.Although the cited technology of above-mentioned patent is arranged, owing to need very high voltage, the solid state circuit scheme of line interface circuit has been got rid of the function of ring at present.
In the modern telephone system, when a bell signal is added on the line circuit,, one 200 volts even higher voltage will be arranged in order to make the telephone ringer ringer work of joining with many extensions.This very high voltage request does not conform to common integrated circuit technique.Therefore, each parts that is used in the integrated circuit do not have a big like this voltage request that working signal is required of disposal.
Certainly can understand, recognize that the prior art of these problems also provides various circuits to go to solve this class problem.For example, be entitled as " telephone line and system " (January 10 nineteen eighty-three is by little R.C.W. Qi Er (R.C.W.Chea at portion, submission such as Jr), application number is 456, No. 638, and transfer the assignee in this) still unratified related application in, narrated a scheme that adopts 80 volts voltages, bipolar semiconductor circuit realization ring.This circuit can be directly driven by the battery of telephone exchange.
As everyone knows, most of telephone exchange functions are supplied with 50 volts of direct current signals of an extension by line circuit.This direct current signal is to be provided by the battery in the telephone exchange, and is used to make line circuit and extension set work.Can recognize from above-mentioned application that as people when foregoing circuit during by the telephone exchange battery-powered operation, it can not directly produce ringing voltage.Furtherly, the parts in line circuit must be provided with protection to prevent because short circuit, power supply is disturbed mutually and because the infringement that lightning and other disturb the moment surge voltage that produces to cause.For the protection circuit circuit is not subjected to the infringement of these phenomenons, people are forced to use appurtenances.This has caused the increase of line cost again.Another key factor is that line circuit should have optimal design, so that from the switch battery, draw minimum bias current, thus it is too high to avoid the circuit reactive current to dissipate.As what people were familiar with, the number of the line circuit in the telephone switching system is the function of number of users.Subscriber's line can surpass 100,000 or more in a large scale system, and therefore, the condition that provides significantly is provided the job costs that are reduced to converting system that any point line circuit power looses.
Therefore, purpose of the present invention designs a kind of broadband, high voltage and high-power amplifier exactly.This amplifier is suitable for providing speech current, the coupling high-frequency signal measurement with exchange speech.And for providing a ringing voltage about user loop in the telephone exchange.
Fig. 1 is the broadband of prior art, the rough schematic view of high-voltage amplifier;
Fig. 2 represents the amplifier block diagram with the work of large-signal equivalence pattern;
Fig. 2 A represents the amplifier block diagram with the work of small-signal equivalence pattern;
Fig. 3 is one group of curve of describing amplifier in different loads condition lower frequency characteristic;
Fig. 4 is the block diagram that the amplifier of transfer ratio booster is adopted in expression;
Fig. 5 is the detailed maps of amplifier shown in Figure 1;
Fig. 6 is the detailed maps of amplifier shown in Figure 4.
Referring to Fig. 1, drawn the rough schematic view that adopts the amplifier circuit of backhaul converter according to the present invention among the figure.
In fact, the backhaul converter has been used in the circuit with low frequency signal.The backhaul converter is a quite numerous and diverse circuit.It is providing some very Ideal Characteristics aspect balance output, high-insulation, the high-tension power capabilities.In any case, the basic problem of backhaul converter is broadband and relevant stability problem.Because the subscriber's line circuit has very complicated characteristic and very high requirement in the telephone exchange, bandwidth and stability problem mix.In fact, subscriber's line has a resistive impedance, and its resistance is the function of subscriber's line length.Following explanation, amplifier of the present invention solves bandwidth and stability problem to the resistance characteristic of user loop as the intrinsic parameter in the design.
Therefore, referring to being marked as R among Fig. 1
LAn impedance 11, what this impedance was represented is subscriber's line or user loop.Journey converter 10 is connected on the subscribers feeder once.Amplifier 12 is buffer amplifiers, and one of them input is connected on one side of subscriber's line, and another input is connected on the another side of subscriber's line.The output of amplifier 12 is connected on the input of adder 13.Another input of adder indicates Vi, is the input signal in subscriber's line loop.Therefore signal Vi can be bell signal, voice signal or high-frequency signal measurement.These signals that are added on the telephone line circuit are well-known.
The input of second amplifier 14 is received in the output of accumulator.As described below, amplifier 14 provides gain and frequency shaping for line circuit.The output of amplifier 14 is connected on an input of comparator 15.Another input of comparator 15 is connected to a repeated reference source 16, and is as described below, and reference source 16 produces a triangular wave as comparator reference.The output of comparator 15 connects the grid of field effect transistor FET17.The source electrode of FET17 and drain electrode with as the transformer T of a backhaul converter part
1Winding 18 serial connection.Transformer T
1Winding 19 have a resistance that terminates at diode 20 extremely to go up, and the negative electrode of diode 20 is connected on the subscriber's line.
In order to fully understand the working condition of Fig. 1 circuit, be necessary each element is briefly described.
In fact, as shown in the figure, the backhaul converter 10 that is drawn in the frame of broken lines is parts of a standard of comparison.In the analysis of backhaul converter 10, FET17 is as a switch, by having the pulse transformer T of winding 18 and 19
1Transmission of power.Electric capacity 21 plays energy storage unit, illustrated R
LIt is load resistance.Though it mainly is ohmic it should be noted that R, also can comprise the reactance composition.
As shown in Figure 1, produce the output of a pulse duration as the comparator 15 of pulse-width modulator; This pulse duration t
PIt is function by the error voltage of circuit generation.At time t
PDuring this time, in the elementary winding of energy storage under transformer.In the meantime, electric capacity 21 and load resistance are owing to the effect of diode 20 is spaced.Therefore equivalent electric circuit during this period of time comprises and voltage V
bThe winding 18 of series connection.FET17 is at t
PSetovered in time, thus power supply V
bBy winding 18 ground connection.So energy deposition is in primary winding 18 during this period.t
PWhen finishing during this time, the FET bias off, diode 20 conducting owing to the backhaul effect of transformer, thus the energy that is stored in the elementary winding is sent to electric capacity 21 and load R
LIn.
By the course of work of narrating previously as can be known, the backhaul converter is relevant with transfer function G.This available mathematical expression is represented it.
The transfer function of backhaul converter is:
Wherein
G
2The transfer function of=backhaul converter 10.
The efficiency factor of α=circuit is a constant.
V
0=R
LOn voltage.
L
PThe inductance of=winding 18.
T=is added in the repetition rate of the triangular wave on the comparator 15.
The output of comparator 15 is that as shown in Figure 1 width is t
PPulse.t
PBe from the voltage Ve of amplifier 14 function with respect to triangular voltage Bob value.Comparator 15 also has a transfer function G1, and it asks method as follows:
Wherein:
Va＝Sa·ta
The slope of Sa=triangular wave
ta＝T/2
From top equation as can be seen: width or duration t
PIt is function from the voltage Ve of amplifier 14.As for other composition of representing among Fig. 1, as can be seen: be expressed as A
1Amplifier 12 be a signal limiting device basically, be to detect subscriber's line or resistance R
LOn voltage.This Voltage Feedback is to an input of summation circuit 13.This voltage is relevant with feedback factor sometimes, also may be efficiency characteristic.
Accumulator (S
P) 13 effect is that feedback signal and an input signal Vi from amplifier 12 are done algebraic addition, produces an output signal of representing the difference of two error signals.Amplifier 14(A is delivered in the output that contains this error signal from adder
2) input.This amplifier carries out shaping to the frequency response of feedback loop.
Can be the load resistance R that subscriber's line resistance constitutes basically by finding out among Fig. 1
LTo circuit is a DC load; Also be amplifier G
2The gain composition.Furtherly, R
LWith the combination of electric capacity 21 are peak values of amplifier frequency response.
Main aspect of the present invention is the gain composition of subscriber's line load impedance as amplifier.In order to keep necessity relation of the line resistance relevant with circuit, can be referring to Fig. 2.The block diagram that presentation graphs 1 circuit is arranged in Fig. 2, so that can analyze circuit according to evolution of feedback controlling theory.Transfer function by the next part of enclosed with dashed lines is represented adder, error amplifier A
1Transfer function with shaping amplifier A.Therefore it is as follows to draw the loop gain function by Fig. 2:
Loop gain=
The efficiency factor of α=adapting converter wherein.
Above-mentioned loop gain function is used for determining and the large-signal and the steady-state behaviour of paraphase amplifier.By following formula as seen, the amplifier circuit gain depends on that the effective impedance of subscriber's line is load R
LTherefore, key of the present invention is: load resistance itself is the key element of Amplifier Design.From should being used for of phone, the R between 100 ohm to 3,000 ohm
LValue has special meaning, wherein these numeric representations the length of the user loop under the receiver-on-hook condition.
With reference to Fig. 2 A, it has represented the small-signal equivalence pattern of wide-band amplifier circuit among Fig. 1.In fact the transfer function of each assembly, as amplifier 12 and 14, and comparator is all represented by the identical transfer function that provides among Fig. 2 with the backhaul converter.Lowercase " s " is used for representing small-signal operation.Based on the pair amplifier small-signal analysis, following equation is set up
To frequency stability analysis, use the loop gain expression formula.Expression formula A
2(S), G
1G
2(S) and Kz following form is arranged:
Here gm=constant, K
3And ω
0It is the load characteristic parameter.
When frequency＜＜is set up pulse-width modulation (PWM) frequency during fm
According to the small-signal analysis of pair amplifier, the load impedance of circuit is also depended in the response of the overall gain of frequency expression formula and amplifier as can be seen.
Referring to a sets of curves shown in Figure 3, this sets of curves has represented that amplifier is at DC load R
LUnder the characteristic curve of expression frequency.Curve 1 and curve 2 are R
LOpen loop forward amplifier gain frequency characteristic when equaling 3,000 ohm and 300 ohm respectively.Curve 3 is frequency representations of amplifier 14, and is used for frequency shaping to entire circuit, to satisfy stability requirement.
Curve 4 and curve 5 are illustrated in load resistance R
LUnder the characteristic curve of peak value, it is by R
LAnd C
1Common decision.Curve 6 is by A
1The closed loop gain frequency of the amplifier expectation of determining.The dotted line of curve 6 represents that this part also may be a frequency characteristics.Loop gain is to be determined by the open-loop gain in loop and the difference between the closed loop gain, is painted among the semi-logarithmic scale figure used among Fig. 3.
In fact, the Design of Amplifier target is the most loop gain that guarantees 34dB, so as at the simulated voice frequency band in 3.0KHz place operate as normal.It approximately is half of pulse width modulator frequency that the 0dB crossover frequency of loop gain is selected in, to reduce the influence of the whole frequency performance of its pair amplifier.Certainly, the principal element of definite amplifier frequency response remains pair amplifier A as everybody knows
1And A
2The suitable selection of response of transfer function.
Possible some application requirements has a higher transfer ratio.In fact, the transfer ratio of amplifier is defined as the maximum rate of change of output voltage for the time.For the transfer ratio that makes the broadband high-voltage amplifier is improved, Fig. 4 has provided reference circuit, mainly is to comprise a level phase shifter 22 that is connected in the transfer ratio intensifier circuit 23.The transfer ratio booster 23 that will explain is to be controlled by the error signal Ve that appears at amplifier 14 outputs through level phase shifter 22.As will illustrating, at high impedance status, resemble when error signal Ve relatively for timing, transfer ratio booster 23 is the normal off state.When Ve transferred negative value to, booster 23 was opened gradually.In Fig. 4, similar parts have been indicated same reference number.As described below, Fig. 1 and amplifier architecture shown in Figure 4 can make line circuit work under high voltage and high power capacity.This amplifier can drive 200 volts of ringing signal voltages, and voice band signal, remote control detection signal and direct current speech current.This amplifier does not need the used high bias voltage of base amplifier just can provide high voltage operation.
This characteristic has caused the electric current efficiency operation.Certainly, should understand,,, just require 200 volts or higher power supply for 200 volts signal is provided for the design of base amplifier.This design of the present invention is a kind of quite firm amplifier, and it can prevent to resemble short circuit, and power supply is disturbed and faults such as surge mutually.The output of amplifier provides the output signal of a balance.Therefore, it can provide the good insulation performance between user loop and the circuit ground.In this amplifier, line load itself is the intrinsic factor in the Amplifier Design, thereby has directly constituted amplifier gain and frequency characteristic.
As people as seen from Figure 1, critical piece of the present invention resembles amplifier A
1, A
2, accumulator and comparator all are made of the low pressure integrated circuit.Remaining part resembles transistor 17, is discrete parts.Transistor 17 is a high-voltage MOS transistor preferably.Because high-voltage amplifier can directly produce ringing voltage, therefore, the utilization of high-voltage amplifier can be cancelled ring generator and ring circuit closing relay, thereby has improved systematic function.
Referring to Fig. 5, it has represented the circuit diagram of Fig. 1 structure in more detail.By finding out among Fig. 5, subscriber's line is by lead 30 and 31 expressions; Its impedance is by load impedance B
LI.e. 32 expressions.The energy storage unit electric capacity 33 of backhaul converter is connected across on lead 30 and 31.Diode 34 and transformer 35 are formed the required primary element of backhaul effect with field-effect transistor 36 actings in conjunction.
Capacitor 37 is connected with resistance 38 and is connected across on the elementary winding of transformer 35, causes transistor 36 electrical breakdowns as a damper circuit to prevent the high voltage induction spike.With the gate pole of transistor 36 join be one with resistance 40 diode connected in parallel 39.Grid is received the output of comparator 42 by electric capacity 41.Diode 39, electric capacity 41 and resistance 40 have been formed the level phase shifter.Amplifier A
1Promptly 45 is differential amplifiers, and its reverse input end is connected on the circuit 30 by resistance 46; Its positive input is connected on the circuit 31 by resistance 47.Resistance 48 is connected between the output and its reverse input end of amplifier 45; Resistance 49 then is connected between its positive input and the ground.Therefore, amplifier 45 is used for predicting the voltage that is added on subscriber's line or the load resistance 32 with differential mode, and differential signal is changed into a termination output signal in its output biography.
The output of amplifier 45 is received amplifier 50(A through a series resistance 51
2) reverse input end.This reverse input end also is connected to a resistance 52, and its other end is connected to input voltage Vi.Resistance 53 is connected between the input and output of amplifier 50; And playing the frequency of pair amplifier 50, the series circuit of resistance 54 and electric capacity 55 carries out shaping.Amplifier 50 is as adding up contact work when gain and frequency shaping are provided.Therefore, the error signal Ve of amplifier is added in the positive input of comparator 42.The reverse input end of comparator 42 is connected on as described in Figure 1 on the triangular-wave generator.As has been noted, comparator 42 is compared error signal and triangular wave, produces pulse width modulating signal at its output.This signal is added on the grid of transistor 36 by electric capacity 41.
The drain electrode of transistor 36 is connected on the bias supply, and the bias voltage of amplifier 45,50 and comparator all obtains from general DC power supply, and DC power supply can be in 5 to 15 volts of scopes.As seen from Figure 5, the output of amplifier 45 is the functions that are added in the differential voltage on the load resistance 32; Ratio decision by resistance 48 to 46 and 49 to 47.These two ratios will select equally and coupling, so that provide a good common mode performance for amplifier.Resistance 46,47,48 and 49 value will be elected high impedance value as reducing power consumption number, and reduce load effect.Be added in the output voltage V at load resistance 32 two ends
0Can be high more a lot of than the supply voltage that bias voltage is provided for amplifier 45 and 50.Therefore, selected resistance 48 and 46 and 49 and 47 ratio will make the voltage of amplifier 45 inputs be no more than their common mode attitude scope, and make output voltage unsaturated.In fact, just as will be descr, in order to improve link performance, the ratio of these resistance can with frequency dependence.The output signal of amplifier 45 is functions of voltage on the resistance 32.And be added in the input of amplifier 50 with Vi.
As shown, error signal Ve delivers to the positive input of comparator 42.Triangular wave is delivered to its negative input.Comparator 42 compares two signals, and producing a width at output is t
PPulse.t
PValue depend on the size of error voltage Ve.Bigger error signal produces the pulse of broad.In fact, the repetition rate of triangular wave is 512KHz.Therefore, can conclude that comparator 42 is as a pulse width modulator.t
PWidth be proportional to this error signal.Pulse t
PBe coupling on the grid of transistor 36 by electric capacity 41 capacitives.The time constant of electric capacity 41 and resistance 40 will be selected enough greatly to keep pulse t
PGlobality.Diode 39 plays clamping action, and the pulsion phase at the grid place of transistor 36 is lied prostrate for vb(-48) for just, this will supply with a forward grid one source pole voltage and make transistor 36 conductings, make electric current flow through the elementary of transformer 35 in impulse duration.T during this
PIn, diode 34 is partially anti-, so energy is stored in the transformer by elementary winding.At t
PDuring end, transistor 36 disconnects; Electric current no longer flows through this transistor.Therefore, since feedback effect, diode 34 conductings, and energy is at T-t
PBeing transferred to electric capacity 35 during this time goes.
The work of backhaul converter is known, and explains in front.
With reference to Fig. 6, this is to express Fig. 5 amplifier circuit, further is included in the transfer ratio booster circuit that brief explanation is crossed among Fig. 4.The course of work of remaining part is the same with Fig. 5 among Fig. 6.Therefore, indicated identical reference number for these same parts.In any case as shown in Figure 6, the output of amplifier 50 is connected on the emitter of transistor 70,70 base earth.Error signal is connected on the emitter of transistor 70 by resistance 71.This transistorized collector electrode is connected on the subscriber's line 30 by resistance 72, and the collector electrode of transistor 70 also is connected on the base stage of transistor 73, and the emitter of transistor 73 is connected on again on the subscriber's line 30.The collector electrode of transistor 73 is connected on the subscriber's line 31 by resistance 74.Therefore, following explanation, transistor 70 with resistance 71 and 72 as the level phase shifter, and transistor 73 with resistance 74 as the transfer ratio booster.This line function is as follows.The transfer ratio booster designs to such an extent that only just work when the energy storage of electric capacity 33 surpasses requiring of load resistance 32.This condition just occurs when error voltage Ve is negative value.When Ve reached approximately-0.6 volt, 73 conductings were managed in transistor 70 beginning conductings successively.This practical work process is that electric capacity 33 is provided with an additional load.Therefore electric capacity will speed up and releases energy.When Ve was tending towards more negative, transistor 73 can abundant conducting also be accelerated to emit energy from electric capacity 33.When reaching balance, when promptly the energy requirement of the load resistance 32 of Zeng Jiaing equals increase energy that electric capacity receives, error signal Ve will become on the occasion of.When error signal become on the occasion of the time, transfer ratio booster circuit has just ended.
Be two additional RC network 80 and 81 as shown in Figure 6, they are connected with resistance 46 and 47.RC network 80 and 81 is the frequency characteristic that produces each factor of feedback factor basically.This be by the resistance 46 that Fig. 5 is selected and 47 resistance each all be divided into two resistance, and on the resistance that each shown in Fig. 6 is told the cross-over connection shunt capacitance.This modification makes the link performance optimization that the bigger degree of freedom arranged.Dotted line of representing among Fig. 3 and curve 6 have represented to revise the frequency characteristic of back amplifier.
In the above in the description of being done, to the amplifier of backhaul converter as intrinsic parameter in the design is described.The backhaul converter has and is connected across on the telephone line and by the energy storage capacitor that is connected on the diode element control on the backhaul transformer secondary output winding.The line impedance of subscriber's line or load impedance are as an element of amplifier, and then ride gain and frequency response.Therefore the frequency response peak value of amplifier is made up of user load impedance and amplifier storage capacitor.The backhaul converter is to be higher than the pulse width modulator of working under the high frequency of 512KHz by one in frequency to control.Like this, the requirement to the backhaul transformer is exactly: it can be the parts of a minimum compactness.This amplifier is so that ringing voltage and direct current speech are added on the telephone line; Providing insulation to guarantee reliably working under common instantaneous interference simultaneously and this interference can cause damage to the prior art device.
Claims (20)
1, a kind of broadband high-voltage amplifier of input signal is provided for two-wire circuit (particularly telephone line), concrete telephone line comprises:
A storage capacitor (21) that is connected across on the above-mentioned two-wire circuit;
One contains transformer (T
1) backhaul transformer (10), this transformer (T
1) an elementary winding (18) and a level winding (19) are arranged, secondary winding (19) is connected with above-mentioned capacitor (21) by diode (20), and its elementary winding (18) is connected with switch (17);
Be connected across on the described two-wire circuit, in order to the device (12) that the output signal of representing the cross-line signal is provided;
Adding up device (13,14), the above-mentioned output signal of one input response, its another input (Vi) response puts on the input signal of described circuit, and this adding up device (13,14) and output provide a differential signal (Ve), are applied to the difference of two signals of its input with representative;
Modulating device (15), one input response above-mentioned differential signal (Ve), its another input responds repeated reference signal (16), and its output provides a repetition pulse signal, and the pulse duration of this repetition pulse signal is represented the size of above-mentioned differential signal (Ve); And bringing device, in order to above-mentioned repetition pulse signal is added on the above-mentioned switch (17), size (its size is characterized by the width of above-mentioned pulse signal) according to above-mentioned differential signal makes above-mentioned backhaul transducer (10) be sent to energy on the above-mentioned two line circuits
It is characterized in that it also comprises:
Level moving device links to each other with the output of above-mentioned adding up device, in order to an output signal that provides its value to change in the differential signal given range; With
The transfer ratio intensifier, it is connected across on the described two-wire circuit, and response is from the above-mentioned output signal of described level moving device, in order to the energy of changing from above-mentioned storage capacitor in the scope inner control of given differential signal.
2, broadband according to claim 1 high-voltage amplifier, wherein said adding up device also comprises an amplifier installation (14) that is connected on said output, and said differential signal is being added to said modulating device (15) before, a frequency gaining characteristic is provided for said differential signal.
3, broadband according to claim 1 high-voltage amplifier, wherein the above-mentioned storage capacitor (21) of said two-wire circuit and above-mentioned resistive impedance have constituted the limit of the frequency response characteristic of above-mentioned broadband high-voltage amplifier.
4, broadband according to claim 1 high-voltage amplifier, wherein said two-wire circuit is the telephone subscriber line (30,31) of a resistive impedance value between 100 to 3,000 ohm.
5, broadband according to claim 2 high-voltage amplifier, wherein said adding up device comprises an operational amplifier (50), this amplifier has one to be used to add up from the input of the signal of the first kind of device (45) with said input signal, and comprises that being connected on above-mentioned amplifier (50) goes up the device (53,54,55) that shaping is carried out in frequency response.
6, broadband according to claim 1 high-voltage amplifier, wherein the above-mentioned switch (17) of connecting with above-mentioned elementary winding (18) comprises a field-effect transistor (Q
1), its source-drain electrode path is serially connected in an end of above-mentioned elementary winding, and its grid-control utmost point is connected on the output of above-mentioned modulating device (15), and above-mentioned elementary winding (18) also is connected with a voltage (Vb) source.
7, broadband according to claim 1 high-voltage amplifier, wherein said modulating device (15) comprises a comparator, an input of this comparator responds above-mentioned differential signal, its another input responds above-mentioned repeated reference signal, thereby at pulse-width signal of its output output.
8, broadband according to claim 7 high-voltage amplifier, wherein said repeated reference signal is the triangular signal that a frequency is at least 512KHz.
9, broadband according to claim 6 high-voltage amplifier, the wherein said grid-control system utmost point is connected on the output of said comparator by electric capacity (14), described switch also comprises device (39), and this device (39) is connected on this grid-control system and extremely goes up in order to above-mentioned control signal clamp.
10, broadband according to claim 1 high-voltage amplifier, the device (12) that wherein is connected across on the described two-wire circuit comprises a differential amplifier (A
1), this amplifier (A
1) an input be connected with a line on the described circuit, its another input is connected with another line of described circuit, its output provides a single-ended signal.
11, broadband according to claim 10 high-voltage amplifier, described two inputs of wherein above-mentioned differential amplifier (12,45) are connected on the described circuit by the impedance relevant with frequency (80,81) respectively.
12, broadband according to claim 1 high-voltage amplifier, wherein the device that described repetition pulse signal is applied to described switch comprises a coupling capacitance (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101395.3A CN1006272B (en) | 1985-04-01 | 1985-04-01 | Wideband high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101395.3A CN1006272B (en) | 1985-04-01 | 1985-04-01 | Wideband high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101395A CN85101395A (en) | 1987-01-31 |
| CN1006272B true CN1006272B (en) | 1989-12-27 |
Family
ID=4791821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85101395.3A Expired CN1006272B (en) | 1985-04-01 | 1985-04-01 | Wideband high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1006272B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009114006A1 (en) * | 2008-03-10 | 2009-09-17 | Semiconductor Components Industries, Llc | Method for limiting an un-mirrored current and circuit therefor |
-
1985
- 1985-04-01 CN CN85101395.3A patent/CN1006272B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85101395A (en) | 1987-01-31 |
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