CN103327282A - Method for increasing non-operating-state output impedance of amplifier - Google Patents
Method for increasing non-operating-state output impedance of amplifier Download PDFInfo
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- CN103327282A CN103327282A CN2013101478694A CN201310147869A CN103327282A CN 103327282 A CN103327282 A CN 103327282A CN 2013101478694 A CN2013101478694 A CN 2013101478694A CN 201310147869 A CN201310147869 A CN 201310147869A CN 103327282 A CN103327282 A CN 103327282A
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Abstract
The invention provides a method for increasing non-operating-state output impedance of an amplifier. The method for adding a passive amplifier output impedance circuit allows the added amplifier to be coupled to a single transmission line in parallel, and therefore a plurality of videos or other signals are distributed on remote positions. When passive operations utilize the bootstrap technique (namely a driving feedback network) to increase the whole impedance of the amplifier, the method for adding the passive amplifier output impedance circuit improves the impedance of an amplifier feedback network.
Description
Technical field
The present invention relates to a kind of amplifier for distributing video or other signal of telecommunication.More particularly, a kind of method that increases without the source amplifier output impedance circuit of the present invention is by transmission line video or other signal of telecommunication.
Background technology
In the distribution of video and other signal of telecommunication, use single transmission line (for example coaxial cable or parallel conductor) to transmit a plurality of signals.Usually, a plurality of amplifiers are coupled to the signal that transmits on the single transmission line separately concurrently.In such distribution system, distribute a plurality of signals to cost and the complexity of remote location in order to reduce, a plurality of amplifiers that are coupled are desirable to transmission line.
In general, when a plurality of amplifiers are coupled on the single transmission line concurrently, need to consider the load effect of amplifier on transmission line.For example, when a specific amplifier be enliven and when coupling a signal on the transmission line, remaining amplifier is coupled to can not disturb this coupling (being the reverse terminal of transmission line) on the same transmission line.In other words, remaining amplifier can not change the load impedance that amplifier drives.
Especially, the output impedance of activated amplifier and a series of reverse terminal resistance generally are used to the characteristic impedance of matched transmission line, to reduce the power reflection of transmission line interface.Generally, because the output impedance of activated amplifier is far below 1 ohm, the resistance of inverting terminal resistance and the impedance operator of transmission line are mated very much.Such impedance matching has improved the efficient of transmission system.
Yet, if remaining amplifier has changed the load impedance (being the reverse terminal of transmission line) that amplifier drives, the combination general of so a series of amplifiers and resistance no longer with load matched.This causes inefficiency, in the worst case, can stop transmission fully.Therefore, when an amplifier was active, remaining had very high impedance without source amplifier.
In view of the foregoing, can find out that ideal amplifier will have very large output impedance when amplifier when being passive.If an ideal system comprises a plurality of ideal amplifiers that are coupled on the single transmission line, the amplifier sum that is coupled is unconfined.
Yet the output impedance of amplifier can not realize in above-mentioned ideal style.In passive operation, output impedance is not very large.Therefore, the back-termination impedance of activated amplifier driving is transmitted remaining amplifier change in the line.This load effect has limited the amplifier quantity that is coupled on the single transmission line.
In view of the foregoing, provide a method to allow the Parallel coupled be desirable to the amplifier quantity increase on the single transmission line.
Provide a kind of and increase that to come for distributing video and other signal of telecommunication without the method for source amplifier output impedance circuit also be desirable.
Amplifier with high output impedance further is provided, at its passive state, a plurality of amplifiers is coupled on the single transmission line concurrently to reduce the decay of signal.
The system of a plurality of amplifiers of coupling to the single transmission line, the wherein feedback network of amplifier excess load on transmission line also are provided in addition.
Summary of the invention
The purpose of this invention is to provide the method that an amplifier quantity that allows to be coupled on the single transmission line increases.
Another object of the present invention provides and a kind ofly increases without the method for source amplifier output impedance circuit to come for distributing video and other signal of telecommunication.
Further aim of the present invention provides the amplifier with high output impedance, at its passive state, a plurality of amplifiers is coupled on the single transmission line concurrently to reduce the decay of signal.
In addition, the system of a plurality of amplifiers of purpose of the present invention or one coupling to the single transmission line, the wherein feedback network of amplifier excess load on transmission line.
Technical solution of the present invention:
According to these goals of the invention, a kind of amplifier circuit for system is provided, transmit a plurality of signals by transmission line.This amplifier circuit comprises a buffer circuit, and buffer circuit is coupled to the feedback network of driving amplifier circuit, increases the active impedance of feedback network.When amplifier circuit is passive (when it during at non-magnifying state), buffer circuit can optionally activate and cause amplifier circuit to have very high output impedance.
Also provide a kind of increase for system without the source amplifier output impedance circuit, transmitted a plurality of signals by transmission line.When increasing without source amplifier output impedance circuit passive, the feedback network of the drives amplifier circuit of coupling optionally increases the active impedance of amplifier circuit feedback network, causes the increase of the active impedance of overall amplifier circuit.
Increase of the present invention allows ever-increasing amplifier to be coupled to concurrently on the single transmission line without the method for source amplifier output impedance circuit, and this single transmission line does not have the shortcoming without the source amplifier excess load.
Utility model patent: a kind of television signal shunting device, application number: 200920077179.5
Description of drawings
Accompanying drawing will be further described advantage of the present invention.The reference character of part of devices is indicated in the drawings.
Fig. 1 has shown the schematic diagram of a typical prior art, transmits a plurality of signals of telecommunication by the single transmission line.
Fig. 2 has shown the schematic diagram of another typical prior art, transmits a plurality of signals of telecommunication by the single transmission line.
Fig. 3 has shown the schematic diagram of amplifier circuit of the present invention, when passive states, increases the output impedance of amplifier circuit.
Fig. 4 has shown the schematic diagram of a system of the present invention, is used for transmitting a plurality of signals of telecommunication by the single transmission line.
Fig. 5 has shown another schematic diagram of the present invention, is used for transmitting a plurality of signals of telecommunication by the single transmission line.
Fig. 6 is a detailed schematic diagram of Fig. 5 amplifier.
Fig. 7 is a detailed schematic diagram of Fig. 6 buffer 56.
Embodiment
Fig. 1 has shown the schematic diagram of a typical prior art, transmits a plurality of signals of telecommunication by the single transmission line.Each amplifier circuit 10 coupling of Fig. 1 video and common transmission line 16 (for example coaxial cable or and column conductor) of other signal of telecommunication to one separately distributed to remote load 18.Each amplifier circuit 10 generally includes the amplifier 12 with input 12b, 12c and output 12a.Input electrical signal end VIN1, VIN2, VIN3 and VIN N are coupled to input 12b, and output 12a is coupled on the transmission line 16 by reverse terminating resistor 14 simultaneously.Utilize feedback resistance R by input 12c
FB(it is coupling between output 12a and the input 12c) and R
g(it is coupled to earth terminal) provides and feeds back to each amplifier 12.Generally, amplifier 12 is monolithic integrated circuits, and feedback resistance R
FBAnd R
gThe non-essential resistance that disperses, resistance value by user selection to adapt to specific application.
As shown in Figure 1, a plurality of amplifier circuits 10 are transmitted a plurality of signals of telecommunication by transmission line 16 by Parallel coupled.Yet at non-magnifying state, because amplifier circuit 10 output resistances are very little, when the quantity of amplifier circuit 10 increased, the load of transmission line 16 also increased.
In some prior art systems, in order to solve above-mentioned excess load problem, amplifier 12 is optionally disconnected (i.e. outage), so that special amplifier signal transmission.Therefore, at any time, only have an amplifier 12 to be activated, and all the other will be disconnected without source amplifier.If the output impedance under the off-position is higher than the output impedance under the active state, the loading problem without source amplifier can be reduced so.
Although said method can reduce the load effect on the single transmission line, it has two shortcomings.
The first, when activated amplifier when its output produces a high dv/dt, voltage is coupled to the amplifier of disconnection by stray capacitance.In some cases, coupling produces enough large differential voltage, connects the amplifier of disconnection.This unexpected unlatching can produce bad transient state load impact.
The second, although the just outage when not being used of the amplifier 12 among Fig. 1, it (is resistance R that this method can not remedy feedback network
FBAnd R
g) load effect, this load effect is directly to be loaded on the rear terminal of transmission line 16.
Fig. 2 has shown the schematic diagram of another typical prior art, transmits a plurality of signals of telecommunication by the single transmission line.Compare with Fig. 1 system, when when amplifier out produces high dv/dt ' s, the bad unlatching that a plurality of amplifiers of Fig. 2 system are used for preventing above-mentioned accident and disconnect amplifier.
Each amplifier 20 among Fig. 2 comprises input circuit 22, and this input circuit 22 has input 22b and 22c and output 22a, is used for driving a corresponding output buffer 24.Another buffer 26 (being unity gain buffer) and each output buffer 24 coupling keep output buffer 24 at high impedance status, and whole amplifier circuit are passive.The impact that buffer 26 reduces in the input stray capacitance of output buffer 24, because differential voltage, at the of short duration transmission line load of the input permission of output buffer 24.When amplifier circuit 20 was passive, buffer 26 kept operating states, and other remain open.
Although Fig. 2 system has overcome the impact of above-mentioned transient state load, system can not compensation feedback network (be resistance R
FBAnd R
g) load effect.These resistance directly are carried on the rear terminal of transmission line 16, and output buffer 24 remains on high impedance status.
For example, buffer 26 shown in Figure 2 can increase the output impedance of output buffer 24 to the resistance, this resistance and the resistance R that surpass 100 kilohms
FBWith R
g(normally 1 kilohm) will be carried in transmission line and resistance value is on 2 kilo-ohms the rear end resistance.Therefore, although under the positive pole operation, the output buffer 24 of Fig. 2 can remain on very high impedance state, and amplifier circuit 20 can not solve the load effect of feedback network.Along with the increase of amplifier quantity, feedback network is loaded on the rear terminal of transmission line again.
Fig. 3 has shown the schematic diagram of amplifier circuit of the present invention, when passive states, increases the output impedance of amplifier circuit.The amplifier of Fig. 3 has reduced the load effect of feedback network on transmission line.
The amplifier circuit 30 of Fig. 3 comprises amplifier 32, and a lead-out terminal 32a of amplifier 32 is coupled to the transmission line (not shown).Amplifier circuit 30 also comprises feedback network 34, and the feedback network 34 that is coupling between output 32a and the input 32b provides feedback.Feedback network 34 monitoring output 32a produce the output signal that a feedback signal is come control output end 32a.This feedback can be the form of curtage feedback.When amplifier circuit was operated in non-magnifying state, the circuit 36 in the amplifier circuit 30 was coupling between output 32a and the input 32b and across coming the drive feedback network at feedback network 34, with the active impedance of increase feedback network.The control input end 36a of circuit 36 is used for active circuit 36.Amplifier circuit 30 operation principles are as follows.
Under active operation, the input signal V of amplifier circuit 30 couple input 32b
mTo output 32a, control input end 36a is used for deactivation of circuits 36, so that circuit 36 can not intervene the operation of amplifier circuit 30 basically, and particularly feedback network 34.In other words, under active operation, amplifier circuit 30 is operated under the traditional approach, and amplifier 32 usefulness feedback networks 34 provide the feedback between output 32a and the input 32b.Circuit 36 does not change this running basically.
When the user wishes that the output impedance of amplifier circuit 30 increases to reduce load on transmission line, the load effect of feedback network 34 particularly, amplifier circuit is deactivated with control input end 36a and is used for active circuit 36.Circuit 36 is used for drive feedback network 34, and for the circuit that does not comprise circuit 36, the active impedance that increases feedback network 34 increases the whole impedance of amplifier circuit 30.Therefore, use method of the present invention, the feedback network load effect on the transmission line can be reduced.The amplifier that the method allows to increase is coupled on the common transmission line concurrently.
Fig. 4 has shown the schematic diagram of a system of the present invention, is used for transmitting a plurality of signals of telecommunication by the single transmission line.Each amplifier circuit 40 among Fig. 4 comprises input circuit 22, the buffer 26 of describing among output buffer 24 and Fig. 2.In addition, each amplifier circuit 40 comprises an additional buffer 48 (for example unity gain buffer), and buffer 48 strides across feedback resistance R from the output of buffer 24
FBBe coupled to inverting input 22c, come the drive feedback resistance R
FBTherefore, when circuit working during in passive states, increased selectively the impedance of amplifier circuit 40.Particularly, buffer 48 drives node 22c, has increased feedback resistance R
FBActive impedance, according to following formula: R
EFF=R
FB/ (1-A
V).
A
vIt is the gain of buffer 48.The gain of buffer 48 is more approaching consistent, and active impedance is just larger.Till now, yield value surpassed+and 0.9, by drive feedback resistance, feedback resistance R
FBActive impedance can improve at least one the order of magnitude.
According to the present invention, buffer 48 is a non-inverting amplifier (namely an amplifier has a postiive gain value), and the drive feedback network increases the active impedance of network.Preferably buffer 48 yield value greater than 0 less than 2.Be more preferably buffer 48 yield value (being unit gain) is arranged.
Although the amplifier circuit display buffer 48 among Fig. 4 is directly coupled to feedback resistance R
FBBetween drive, increase the active impedance of resistance, the present invention also provides the embodiment of other same effect.For example, Fig. 5 illustrates the embodiment that another is such.
Fig. 5 has shown another schematic diagram of the present invention, is used for transmitting a plurality of signals of telecommunication by the single transmission line.Among Fig. 5 each amplifier 50 comprise output buffer 24 and with buffer 26 similar in Fig. 2 and Fig. 4.Output buffer 24 is driven by input circuit 52, and input circuit 52 comprises an output 52a and a control input end 52d who is used for the receive logic signal, and whether this logical signal indicating magnifier circuit 50 is activated.Circuit 50 also comprises an additional buffer 56 (for example unity gain buffer), and under passive states, this buffer 56 is used for increasing amplifier circuit 50 output impedance as described in Figure 4.The operation principle of amplifier 50 is as follows:
Under active operation, the class of operation of input circuit 52 is similar to the input circuit 22 among Fig. 4.Buffer 26 and 56 is deactivated, to allow amplifier circuit 50 by feedback resistance R
FBWith R
gProduce feedback effect.
Under passive operation, buffer 56 is activated to drive the inverting input 52b of input circuit 52.Resistance R
l(for example one 1 kilohm resistance) is used for being coupled inverting input 52b to drive input circuit 52.Conversely, input circuit 52 is used for further driving being coupled to feedback resistance R
FBInverting input 52c.In other words, the internal drive of input circuit 52 (not being presented among Fig. 5) is used for being coupled in-phase input end 52b to inverting input 52b, to allow buffer 56 drive feedback resistance R
FBThis coupling is similar to feedback resistance R among Fig. 4 with raising
FBActive impedance (one of them buffer direct-coupling on feedback resistance with drive feedback resistance).
The amplifier circuit of Fig. 5 has special advantage than Fig. 4 in the configuration of circuit.For example, in the current feedback topology, input circuit 22 adopts current feedback, and input circuit 22 is usually responsive to stray capacitance.In some situation of active operation, this stray capacitance can cause the unstable of amplifier circuit or concussion.Therefore, if the buffer of Fig. 4 48 need to have sizable triode to drive low resistance R
g, R
gBe coupling between input 22c and the earth terminal, the large electric capacity relevant with triode can add stray capacitance at input 22c place.Therefore, if the amplifier circuit among Fig. 4 has designed a current feedback structure, need so to consider to make such stray capacitance.
If current feedback, the amplifier circuit of Fig. 5 has reduced the impact of stray capacitance so.Fig. 5 circuit function is embodied in the use that drives triode in the input circuit 52.These drivers not only are used for active operation but also are used for passive operation assisting to drive in-phase input end, and this in-phase input end is coupled to feedback resistance R
FBBecause the driver of input circuit 52 also is used for passive operation, in Fig. 5, the stray capacitance influences relevant with the current feedback structure can be reduced.
Fig. 6 is a detailed schematic diagram of Fig. 5 amplifier 50.Amplifier 50 among Fig. 5 comprises input circuit as described below 52 and output buffer 54.
Input circuit 52 comprises eight double pole triodes (Q1-Q8), current source 60 and 62 and current mirror circuit 68 and 70.According to the present invention, during amplifier operation active and passive, input circuit 52 is used to the drive feedback network.
Under active operation, triode Q1, Q2, Q3, Q4, Q6 and Q8 form a differential amplifier, and this differential amplifier has input 52b and 52c and an output 52a, and output 52a takes from output 68a and the 70a of current mirror circuit 68 and 70.Under passive operation, triode Q6 and Q8 are on-off actions and replace respectively triode Q5 and Q7.This switch allows triode Q1, Q2, and it is that 52b and output node are the buffer circuit of 52c that Q3, Q4, Q5 and Q7 form an input node.Therefore, the driving triode of input circuit 52 is used to form a differential amplifier and a buffer circuit (under passive operation).
As shown in Figure 6, input circuit 52 and output buffer 54 are to be mutually related.The base stage of triode Q1 and Q3 usually is coupled and is connected to input 52b, and their collector electrode is coupled to power supply V separately
-And V
+The emitter of triode Q1 is coupled to power supply V by current source 60
+And be coupled to the base stage of triode Q2, and the emitter of triode Q3 is coupled to power supply V by current source 62
-And be coupled to the base stage of triode Q4.The emitter-coupled of triode Q2 and Q4 together and be connected to input 52c.
The base stage of triode Q5 and Q6 is coupled to a control logic circuit (not shown), and their emitter is coupled mutually and be connected to the collector electrode of triode Q2.The collector coupled of triode Q5 and Q6 is to V
+But the collector electrode of triode Q6 passes current mirror circuit 70, and current mirror circuit 70 provides half output 52a to input circuit 52.Triode Q7 and Q8, current mirror circuit 68 and triode Q4 form second half of output 52a of input circuit 52 with similar coupling.
The output buffer circuit of amplifier 50 comprises four triodes (Q9-Q12) and two current sources (64 and 66).The base stage of triode Q9 and Q10 intercouples and is connected to output 52a, and this output 52a provides an input signal to buffer circuits 54, and their collector electrode is coupled to respectively V
-And V
+The emitter of triode Q9 is coupled to V by current source 64
+And be coupled to the base stage of triode Q11.The emitter of triode Q10 is coupled to V by current source 66
-And be coupled to the base stage of triode Q12.The collector electrode of triode Q11 and Q12 is coupled to respectively V
+And V
-, and their emitter-coupled forms the output of amplifier 50 together.
The output of amplifier 50 is coupled to input and the feedback resistance R of input buffer 26 and 56
FBAn end.Feedback resistance R
FBThe other end be coupled to input 52c and resistance R
g, resistance R
gThe other end be coupled to earth terminal.The output of buffer 26 is coupled to the node that is formed between input circuit 52 and the output buffer 54, and the output of buffer 56 is coupled to input 52b.
Under active operation, the input signal V of amplifier 50 coupling amplifiers
InTo V
OutUnder passive operation, output buffer 54 is disconnected and keeps a very high impedance by buffer 26, and input circuit 52 is combined with to increase feedback resistance R with buffer 56
FBActive impedance.Under two kinds of operator schemes, triode Q1-Q4 will be switched on.
When amplifier 50 is active, triode Q5 and Q7 are disconnected, and triode Q6 and Q8 are switched on, and buffer 26 and 56 is disconnected (not shown by control logic one).Input signal V
InForm and enter in current mirror circuit 68 and 70 by triode Q1-Q4 by amplifier, wherein output signal is provided to output 52a.Output signal is passed output buffer 54 to V
Out, enter again transmission line (usually by a rear terminal resistance-demonstration).
When amplifier 50 was passive, triode Q5 and Q7 were switched on, and triode Q6 and Q8 are disconnected, and buffer 26 and 56 is switched on (not shown by control logic one).Disconnect triode Q6 and Q8, be delivered to output buffer 54 with the signal code that stops input circuit 52.As previously mentioned, buffer 26 guarantees that output buffer keeps passive and keeps a high impedance status.Buffer 56 is used for driving input 52b.The signal of input 52b is formed by triode Q1-Q4 by amplifier, drives the negative input end 52c of input circuit 52.Therefore, the negative input end of the internal drive by driving fully input circuit 52, the input circuit 52 boot-strap resistor R that combines with buffer 56
FBAnd raising resistance R
FBActive impedance, to reduce on transmission line the load without source amplifier 50.
Work as resistance R
FBWith R
gWhen being discrete elements, input circuit 52, output buffer 54, buffer 26 and buffer 56 preferably are integrated on the monolithic integrated circuit.The present invention allows user selection R
FBWith R
gResistance value, resistance value depends on specific application purpose.
Fig. 6 shows, comprises three independently parts (being amplifier 32, FBN feedback network 34 and circuit 36) although Fig. 3 shows amplifier circuit of the present invention, if specific element can be used for circuit, these elements do not need to separate so.For example, if these elements help to increase the effective impedance of feedback network 34, the circuit among Fig. 3 36 can use the circuit element of amplifier 32 so.Under active and passive operation, the driving triode of input circuit 52 helps the drive feedback network among Fig. 6.
Fig. 7 is a detailed schematic diagram of Fig. 6 buffer 56.Buffer circuit 56 comprises four triodes (Q13-Q16), four diodes (D1-D4), two current source (l
1And l
2), two switches (S1 and S2) and two resistance (R1 and R2).Buffer circuit 56 operation principles are as follows:
Triode Q13 and Q14, current source l
1And l
2, switch S 1 and S2 (this may be traditional Current Control triode) and diode D1 and D2 form an emitter following input stage.Under active operation, switch S 1 and S2 close, and diode D1 and D2 are forward biased, the V of input 24a
iBe coupled to the base stage of triode Q15 and Q16, form an output stage.Diode D3 and D4 are coupled to the emitter of triode Q15 and Q16 separately, and forward bias allows input v simultaneously
lThe output V that is coupled at node 52b
o
Under active operation, the V that loses at input triode Q13 and Q14
BeWill be by the V that obtains at output triode Q15 and Q16
BeBe compensated.Under active operation, resistance R 1 and R2 (being coupled to separately on triode Q16 and the Q15) have one enough large resistance value stop current loss.
Under passive operation, switch S 1 and S2 disconnect, and resistance R 1 and R2 back biased diode D1-D4 and triode Q13-Q16 reduce from V
i(node 24) is to V
o(node 52b) electric capacity.Under passive operation, triode Q13-Q16 preferably selects size roughly the same and as far as possible little so that further reduce junction capacitance.Voltage source-V
1With+V
2The voltage of (always remaining on on-state) is large so that back biased enough, but voltage is enough little of to prevent the back biased junction breakdown of diode D1-D4 and triode Q13-Q16.
Although the input signal that amplifier circuit shows among Fig. 4 and Fig. 5 (for example VIN1, VIN2, VIN3 and VIN N) is coupled to amplifier 22 and 52 separately by in-phase input end 22a and 52a, this is not necessary situation.Particularly, amplifier circuit of the present invention also can use amplifier 22 and 52 in " anti-phase " topological structure.For example, except in-phase input end 22a and the 52a of input signal in Fig. 4 and Fig. 5 that be coupled separately, input signal can pass through resistance R
gBe coupled to inverting input 22c and 52c.Certainly, in this " anti-phase " topological structure, in-phase input end 22a and 52a will be coupled to earth terminal.
In addition, be coupled to each amplifier circuit although the amplifier circuit of Fig. 3-7 only shows an input signal (for example, VIN1, VIN2, VIN3 and VIN N), this is not necessary situation.For example, amplifier circuit of the present invention can provide an output of taking from multiplexer circuit, and conversely, a such path multiplexer circuit can be used for a plurality of signals of switch.In conjunction with multiplexer circuit, make a signal amplifier circuit can be used for optionally being coupled to a plurality of signals to transmission line.
Therefore, the method that increases without the source amplifier output impedance circuit is provided.The present invention allows a plurality of such amplifiers to be coupled to concurrently on the single transmission line, makes a plurality of videos or other signals of telecommunication be assigned to remote location, to reduce the load effect on the transmission line.
Specific descriptions of the present invention realize that just the category that the present invention protects is not subjected to the restriction of specific implementation for for the purpose of illustrating, right of the present invention is only limited by the claims.
Claims (9)
1. method that increases without the source amplifier output impedance circuit, it is characterized in that: when amplifier circuit is operated in magnifying state, amplifier circuit has an input that receives input signal, an output that produces output signal, the feedback network that amplifier circuit is coupled to the monitoring output signal produces feedback signal with the control output end, and amplifier circuit comprises an amplifier that receives the amplifier of input signal and produce output signal; When amplifier circuit was operated in non-magnifying state, a circuit that is coupled to the drive feedback network had increased the active impedance of feedback network, has namely increased the output impedance of amplifier circuit.
2. increase according to claim 1 is characterized in that without the method for source amplifier output impedance circuit: the drive circuit that is coupled to output has increased the active impedance of feedback network; Amplifier circuit comprises the first input end that is coupled to first node, and this first node receives above-mentioned input signal and is coupled to the second input of Section Point, and this Section Point receives above-mentioned feedback signal; Above-mentioned feedback network is included in the first resistance of output and the second input coupling and at the second resistance of the second input and earth terminal coupling; Drive circuit comprises the buffer circuit of a drive feedback network, and buffer circuit comprises an in-phase amplifier.
3. increase according to claim 2 is characterized in that without the method for source amplifier output impedance circuit: in-phase amplifier has one in zero gain between to two; In-phase amplifier has the gain of an integral body; Amplifier circuit and drive circuit are integrated on the single IC for both individually, and wherein feedback network comprises at least one separation assembly; Buffer circuit at output and the second input coupling or buffer circuit at output and first input end coupling.
4. increase according to claim 3 is without the method for source amplifier output impedance circuit, it is characterized in that: the first amplifier comprises an input circuit, (1) at magnifying state, input circuit plays amplification (2) at non-magnifying state, and input circuit drives above-mentioned feedback network by the second input.
5. increase according to claim 2 is characterized in that without the method for source amplifier output impedance circuit: the first amplifier circuit comprises the first input end that is coupled to earth terminal and the second input; Above-mentioned feedback network is included in the first resistance of output and the second input coupling and at the second input with receive the second resistance of the node coupling of input signal; Drive circuit comprises second amplifier of gain between zero-sum two, and this second amplifier is coupling between above-mentioned output and the inverting input.
6. increase according to claim 5 is characterized in that without the method for source amplifier output impedance circuit: the first amplifier comprises three amplifier of gain between zero-sum two; At non-magnifying state, this first amplifier increases the output impedance of the first buffer circuit at output and the first buffering input coupling.
7. increase according to claim 6 is characterized in that without the method for source amplifier output impedance circuit: above-mentioned input circuit comprises the differential amplifier with a pair of output; At non-magnifying state, be used for preventing the current spread of this input circuit to the first circuit of the first buffer circuit, an input of the first circuit is coupled to a terminal of above-mentioned differential amplifier output; At non-magnifying state, be used for preventing the current spread of this input circuit to the second circuit of the first buffer circuit, an input of second circuit is coupled to another terminal of above-mentioned differential amplifier output.
8. increase according to claim 7 is characterized in that without the method for source amplifier output impedance circuit: above-mentioned differential amplifier comprises: the first current source that is coupled to the first reference voltage; Be coupled to the second current source of the second reference voltage; Base stage is coupled to in-phase input end, collector coupled first triode to the second reference voltage end and emitter-coupled to the first current source; Base stage is coupled to the emitter of first triode, collector coupled arrives above-mentioned in-phase end to the first circuit and emitter-coupled second triode; Base stage is coupled to in-phase input end, collector coupled the 3rd triode to the first reference voltage end, emitter-coupled to the second current source; Base stage is coupled to the emitter of the 3rd triode, collector coupled arrives inverting input to second circuit, emitter-coupled the 4th triode, the first circuit comprises: the 5th triode, its base stage are coupled to a control logic circuit, collector coupled to the collector electrode of the first reference voltage end, emitter-coupled to the second triode; The 6th triode, its base stage are coupled to the collector electrode that above-mentioned control logic circuit, collector and emitter are coupled to second triode; The first current mirror, its first input end is coupled to the first reference voltage end, and the second input is coupled to the collector electrode of the 6th triode, the output of correspondence the first circuit output; The 7th triode, its base stage is coupled to above-mentioned control logic circuit, and collector coupled is to the collector electrode of the second reference voltage end, four triodes of emitter-coupled to the; The 8th triode, its base stage are coupled to the collector electrode that above-mentioned control logic circuit, collector and emitter are coupled to the 4th triode; The second current mirror, its first input end is coupled to the second reference voltage end, and the second input is coupled to the collector electrode of the 8th triode, the output of a corresponding second circuit output.
9. increase according to claim 7 is characterized in that without the method for source amplifier output impedance circuit: above-mentioned differential amplifier comprises: the first current source that is coupled to the first reference voltage; Be coupled to the second current source of the second reference voltage; Base stage is coupled to the first buffering input, collector coupled first triode to the second reference voltage end and emitter-coupled to the first current source; Second triode of the emitter, collector coupled that base stage is coupled to first triode to the first reference voltage end and emitter-coupled to the first buffer output terminal; Base stage is coupled to three triode of the first buffering input, collector coupled to the first reference voltage end, emitter-coupled to the second current source; Four triode of the emitter, collector coupled that base stage is coupled to the 3rd triode to the second reference voltage end, emitter-coupled to the first buffer output terminal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627815A (en) * | 2017-03-21 | 2018-10-09 | 线性技术有限责任公司 | Unity gain buffer with 2 states |
| CN108768319A (en) * | 2018-07-11 | 2018-11-06 | 成都嘉纳海威科技有限责任公司 | A kind of stacking traveling-wave power amplifier of high efficiency three based on active absorbing load |
| CN109428555A (en) * | 2017-08-25 | 2019-03-05 | 哈曼国际工业有限公司 | Bootstrap type application arrangement and the application in unity gain follower |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627815A (en) * | 2017-03-21 | 2018-10-09 | 线性技术有限责任公司 | Unity gain buffer with 2 states |
| CN108627815B (en) * | 2017-03-21 | 2022-09-27 | 亚德诺半导体国际无限责任公司 | Unity gain buffer with 2 state |
| CN109428555A (en) * | 2017-08-25 | 2019-03-05 | 哈曼国际工业有限公司 | Bootstrap type application arrangement and the application in unity gain follower |
| CN109428555B (en) * | 2017-08-25 | 2024-03-12 | 哈曼国际工业有限公司 | Bootstrap application arrangement and application in a unity gain follower |
| CN108768319A (en) * | 2018-07-11 | 2018-11-06 | 成都嘉纳海威科技有限责任公司 | A kind of stacking traveling-wave power amplifier of high efficiency three based on active absorbing load |
| CN108768319B (en) * | 2018-07-11 | 2023-09-01 | 成都嘉纳海威科技有限责任公司 | High-efficiency three-stack traveling wave power amplifier based on active absorption load |
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Application publication date: 20130925 |