CN1066592C - Base-current bias quasi-first-kind circuit - Google Patents
Base-current bias quasi-first-kind circuit Download PDFInfo
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Abstract
The present invention relates to a quasi-first-class circuit of a base electrode current biasing type. The final stage adopts a constant current biasing method. The base electrode of a base electrode current biasing transistor Q1 is connected with the base electrode of a signal amplification output transistor Q3. The base electrode of a base electrode current transistor Q2 is connected with the base electrode of a signal amplification output transistor Q4. The collecting electrode of the base electrode current biasing transistor Q1 is connected with the collecting electrode of the base electrode current transistor Q2 to form the biasing circuit of the present invention. Emitting electrodes of the signal amplification output transistors Q3 and Q4 are connected to form a complementary output circuit. Excitation biasing currents I1 and I2 are respectively input from the emitting electrodes of the base electrode current transistor Q1 and Q2. Collecting electrodes of the signal amplification output transistors Q3 and Q4 are respectively connected with a power supply, and the connection point of the emitting electrodes of the signal amplification output transistors Q3 and Q4 is an output end. The quasi-first-class circuit has the advantages of compact and reliable circuit and high fidelity degree.
Description
The present invention relates to a kind of accurate Class A amplifying circuit, it is used in the amplification output circuit of the complementary fully symmetry of final stage, can be that one-level is to the symmetrical output circuit of multistage complete complementation.
At present, in accurate class a audio power amplifier field, it is several that representational circuit mainly contains " first+class " circuit, " new Class A " circuit, " super Class A " circuit, " no switch " circuit etc.The major defect of these circuit is exactly the circuit complexity, uses element many, debug difficulties, and the AC signal path is not completely free of the influence of other interference signal, and fidelity is low.Another shortcoming redevelopment property exactly is poor, and range of application is narrow, can not with some new amplifying technique compatibilities now.In view of above some, make the application of accurate class a audio power amplifier be subjected to certain limitation, do not come into vogue for a long time.In the accurate kind circuit of tradition, circuit is more succinct, and performance index will be counted " new Class A " power amplifier preferably.Emphatically the principle and the performance shortcomings of " new Class A " amplifier are done a little simple analysis below.
New Class A amplifying circuit adopts the synchronization bias mode, make amplifier when static state, apply certain bias voltage to efferent duct, make efferent duct be in the Class A bias state, and when AC signal was imported, efferent duct was in the Class B operating state again to AC signal, like this, circuit not only distortion is little, and output amplitude is big, and efficient is also very high.
The principle of new Class A mode as shown in Figure 1.When no signal was imported, the equal conducting of diode D1～D4 provided little bias current for power tube BG3～BG6 by power supply E0, E1, E2, makes efferent duct be in the Class A bias state.When the positive half cycle of input signal, because of D1 positively biased, D2 is anti-inclined to one side, and D3 is anti-inclined to one side, D4 positively biased, and D1 conducting this moment, D3 ends, and positive half cycle signal amplifies through BG3, BG5.And D2 ends, the D4 conducting, and power supply continues to keep to BG4, BG6 provides certain bias current, makes the B point voltage keep certain value (by the E2 decision).When the input signal negative half period, similar with it, D1, D4 end, and D2, D3 conducting make the A point voltage keep certain value (by the E1 decision).Make unlikely being cut off of BG3, BG5 pipe.Negative half-cycle signal then amplifies output by BG4, BG6.
Fig. 2 is an employed new class A power amplifier practical circuit diagram in the TechnicsSU-V6 of the Panasonic type audio frequency amplifier.BG11, BG12 and BG13, BG14 constitute complementary type Vbe multiplier respectively among the figure, play a part E0, E1 and E2 among Fig. 1.The big I of quiescent current is regulated by potentiometer W1 and W2.Usually regulate W1 earlier and make it half that quiescent current reaches setting, and then adjusting W2 makes quiescent current reach setting.
New kind circuit is in order to improve its performance index, the electric current more complicated.On the surface, signal code path and bias control circuit are (are among Fig. 1 signal code I and bias current I2 are what to separate) of separating.But, make signal path will be subjected to the influence of other interference signal inevitably owing to adopt additional constant pressure source that final stage is setovered.In addition, new kind circuit utilizes exciting current and constant pressure source by diode D1～D4 final stage to be setovered, at work, diode D1～D4 conducting and cut-off state alternately occur with the signal variation, the switching current that diode causes must be injected into the power amplifier final stage, make final stage switch distortion occur through amplification, although final stage is operated in not cut-off state.This is subjected to the restriction of essence with regard to the fidelity that makes new kind circuit.Non-linear in view of the diode Push And Release, make new kind circuit can only adopt the degenerative form of final stage, be that the negative feedback point is drawn from final stage, and prime is carried out current drives to the back level, can not be used for driven, otherwise the distortion of new kind circuit will sharply strengthen, even be unable to catch up with general class B amplifier.Like this, the application of new kind circuit will be subjected to great restriction, can not integrate with new amplifying technique now.
In addition, number of patent application is 91104500, and notification number is the quasi-class A bias circuit that 1068225 Chinese patent discloses a kind of complementary push-pull output device, and it has first and second resistance/voltage stabilizing two pipe parallel-connection structures.When static state and small-signal, resistance plays dark negative feedback.Dynamically during large-signal, the latent diode of pressing provides current path.The final stage efferent duct is worked by accurate Class A mode.
It is reliable to the purpose of this invention is to provide a kind of simple in circuits, and debugging is easy, the fidelity height, and applied range, technical indicator can reach the base-current bias quasi-first-kind circuit of pure kind circuit level.
Base-current bias quasi-first-kind circuit of the present invention, final stage adopt constant biasing, rather than adopt the constant voltage biasing, and this point and traditional final stage bias mode are essentially different.
The present invention comprises as shown in Figure 3: base current biasing triode Q1, Q2, Q1 and Q2 constitute the biasing circuit of this accurate kind circuit.Q3, Q4 are that signal amplifies efferent duct.The base stage of base current biasing triode Q1 connects the base stage that signal amplifies efferent duct Q3, and the base stage of base current biasing triode Q2 connects the base stage that signal amplifies efferent duct Q4.The collector electrode of the collector electrode of base current biasing triode Q1 and base current biasing triode Q2 links, and constitutes the biasing circuit of this accurate kind circuit.The emitter that signal amplifies efferent duct Q3, Q4 links, and constitutes complete symmetrical complement output circuit.Excitation bias current I1 and I2 import from the emitter of base current biasing triode Q1, Q2 respectively.The collector electrode that signal amplifies efferent duct Q3, Q4 connects power supply respectively, and the contact that the emitter of signal amplification efferent duct Q3 and signal amplify the emitter of efferent duct Q4 is an output.
In order to regulate final stage quiescent current and base current biasing triode Q1, Q2 residing " amplification " and " saturated " state, the present invention connects an adjusting resistance R 1, R2 respectively between the emitter of base current biasing triode Q1, Q2 and base stage, as shown in Figure 5.
For the emitter that reduces base current biasing triode and the voltage between the collector electrode, make the base current offset when static state, be in slight saturation condition, eliminate the junction capacitance influence between base current biasing transistor base and the emitter, guarantee the smooth connection of positive-negative half-cycle output signal simultaneously, at base current biasing triode Q1, Q2 inter-collector serial connection step-down source E1 (E2, E3).Step-down source E1 (E2, E3) can be the step-down source of voltage-stabiliser tube, diode, resistance, Vbe multiplier, complementary type Vbe multiplier and other type, as shown in Figure 6.
In order to reduce the voltage between base current biasing transistor emitter and the collector electrode, eliminate junction capacitance influence between base current biasing triode base one collector electrode, guarantee the smooth connection of positive-negative half-cycle signal, between the collector electrode of base current biasing triode Q1, Q2, be connected in series buck diode, as shown in Figure 8.
Base-current bias quasi-first-kind circuit of the present invention can be that one-level is to multistage complete symmetrical complement amplification output circuit.As shown in Figure 6, be that the complete complementary symmetrical amplifying circuit of each level is respectively setovered by one-level base current offset circuit, their annexation is: the emitter of the signal amplification efferent duct of the complete complementary amplifying circuit of previous stage connects the emitter of back one-level biasing circuit respectively, and the contact that the emitter of the signal amplification efferent duct of the complete complementary symmetrical amplifying circuit of the last grade links connects load as signal output part.
Compared with the prior art the present invention has following characteristics:
1. simple in circuits, particularly efferent duct number of poles are more succinct after a little while, just can debug and can come into operation, and to the no specific (special) requirements of β value of offset and instrumentation tubes, just can normally move as long as wiring is errorless.
2. the big characteristics of another of this circuit are that the constant biasing circuit of AC signal path and other circuit do not have any pollution, the fidelity height, and its performance index are equal to pure kind circuit.
3. this circuit performance is superior, and stability is high, when the parameter of variations in temperature and pipe changes, can both keep suitable stability, and the final stage quiescent current is subjected to the variable effect of bias current very little, and bias current big and little can make final stage be in the lightly conducting state.
4. because biasing circuit uses element few, do not use elements such as electric capacity and inductance, and can debug, stability is high, so that integrated, easily makes the integrated power amplifier of low distortion.
5. this circuit is used for pre-amplification circuit and the integrated operational amplifier advantage is more obvious.
6. noise is low, and response speed is fast.
Some supplementary notes:
1. unique what will pay special attention to is its frequency characteristic to selecting for use of offset, should select the high pipe of high-end cut-off frequency FT for use, and its b-c junction capacitance is the smaller the better as far as possible.
2. for the offset of the last grade, its emitter junction must have certain anti-flow valuve, in case during power amplification, emitter junction damages because of electric current is excessive.
3. when static state,, preferably offset is all transferred at magnifying state, be one at least and be in magnifying state that another is in slight saturation condition if be not connected in series potential source.
The harmful effect that the b-C junction capacitance causes when 4. overturning for eliminate bias tubulose attitude can be at collector electrode string one resistance, voltage-stabiliser tube or other voltage stabilizing circuit of offset.
Further specify content of the present invention below in conjunction with accompanying drawing.
Fig. 1 is the new class-a power amplification circuit schematic diagram of prior art.
Fig. 2 is an employed new class A power amplifier practical circuit diagram in the TechnicsSU-V6 of the Panasonic type audio frequency amplifier.
Fig. 3 is base-current bias quasi-first-kind circuit basic principle figure of the present invention.
Fig. 4 is base-current bias quasi-first-kind circuit working example figure of the present invention.
Fig. 5 is quiescent current Principles of Regulation figure.
Fig. 6 is the complete accurate kind circuit schematic diagram of the inclined to one side integral expression of base current.
Fig. 7 is base-current bias quasi-first-kind circuit application example (one).
Fig. 8 is base-current bias quasi-first-kind circuit application example (two)
Fig. 9 is base-current bias quasi-first-kind circuit application example (three).
The present invention comprises as shown in Figure 3: base current biasing triode Q1, Q2, Q1 and Q2 constitute the biasing circuit of this accurate kind circuit.Q3, Q4 are that signal amplifies efferent duct, and the base stage of base current biasing triode Q1 connects the base stage that signal amplifies efferent duct Q3, and the base stage of base current biasing triode Q2 connects the base stage that signal amplifies efferent duct Q4.The collector electrode of the collector electrode of base current biasing triode Q1 and base current biasing triode Q2 links, and constitutes the biasing circuit of this accurate kind circuit.The emitter that signal amplifies efferent duct Q3, Q4 links, and constitutes complete symmetrical complement output circuit.Excitation bias current I1 and I2 import from the emitter of base current biasing triode Q1, Q2 respectively.The collector electrode that signal amplifies efferent duct Q3, Q4 connects voltage source respectively, and the contact that the emitter of signal amplification efferent duct Q3 and signal amplify the emitter of efferent duct Q4 is an output.
As shown in Figure 3, Q1, Q2 are base current biasing triode (to call offset in the following text), constitute the biasing circuit of this accurate kind circuit.Q3, Q4 are that signal amplifies efferent duct (to call instrumentation tubes in the following text).When 1., 2. input adds exciting current I1, I2, its direction is shown in the arrow among Fig. 3, the common current value part of I1, I2 is poured off by branch by the collector electrode of offset Q1, Q2, i.e. electric current I C among the figure, and instrumentation tubes Q3, Q4 are by base current maintenance conducting state, i.e. current Ib among the figure 1, the Ib2 of offset Q1, Q2.As long as I1, I2 are non-vanishing, Ib1, Ib2 are just non-vanishing, and Q3, Q4 pipe just can not end.Because the β value of Q1, Q2 pipe is generally all very big, so the colleeting comb Ic of offset Q1, Q2 is approximately equal to the common value part of input bias current I1, I2, and difference I1-I2 is amplified by instrumentation tubes by the base stage of offset.In the amplifying circuit technology, input promotes circuit will make I1, I2 be changed with signal source, the variation of its difference I1-I2 is just reflecting the variation of signal source signal, and difference I1-I2 will be amplified faithfully by Q3, Q4 pipe, and instrumentation tubes Q3, Q4 can not end all the time.The principle place of Here it is this quasi-class A bias circuit.Briefly, the common value of importing the handy exciting current of biasing circuit exactly partly makes instrumentation tubes be in the Class A bias state, and difference is amplified by instrumentation tubes faithfully.
The course of work of this accurate class A amplifier is described in conjunction with concrete circuit down.As shown in Figure 4, this line map is a foolproof power amplifier, and Q1, Q2 constitute biasing circuit, and Q3, Q4 are power output tube, and Q5, Q6 constitute the promotion circuit.When static, under the effect of electric current I 1, I2, base current Ib1, the Ib2 of offset Q1, Q2 makes Q3, Q4 pipe that a little bias current be arranged.Add a positive voltage at input drive current I1 is increased, Q1 is saturated, and the electric current of increase amplifies by the base stage of the base stage inflow Q3 of Q1.I2 reduces simultaneously, makes Q2 work in magnifying state, and the base current of Q2 makes Q4 keep the lightly conducting state.No matter how I1 increases, and how I2 reduces, as long as I2 ≠ 0, Q4 just can not end.When input added a negative voltage, I1 reduces will make Q1 be in magnifying state, and I2 increases makes Q2 be in saturation condition, and how difference between current I2 increases, and I1 reduces the base stage of the base stage inflow Q4 that will make Q2 and is exaggerated.No matter how I2 increases, and how I1 reduces, as long as I1 ≠ 0, the Q3 pipe just can not be cut off.When input input sinusoidal signal, amplifying and saturation condition will alternately appear in Q1, Q2.Saturated offset provides to power tube and promotes electric current promotion loaded work piece, and the offset of magnifying state is used for bearing the shunting task and makes final stage cut-off state not occur by base current.
Amplifying circuit for Fig. 4, no matter at inactive state or magnifying state, if excitation bias current I1 and I2 are very big, because the shunting action of Q1 and Q2, electric current I 1, I2 major part have been poured off by the collector electrode branch of offset, have only few one part of current to inject the base stage of power tube, make power tube remain a little bias current value, its bias current value and I1, I2 are in the same order of magnitude.In amplifying circuit, because I1 and I2 are very little, about about several microamperes, this illustrates that this accurate kind circuit can keep very high efficient, and final stage bias current value can keep sizable stability.
Can see from the operation principle of base-current bias quasi-first-kind circuit, for Fig. 3 and Fig. 4, offset Q1, Q2 are essentially " magnifying state " control valve, promptly instrumentation tubes is to be in " signal magnifying state " in the signal amplification process, still be in " lightly conducting rest " state, by offset " saturated " and the decision of " amplification " state, when offset is in saturation condition, be subjected to the instrumentation tubes of its control then to be in " signal amplification " state, otherwise be in " lightly conducting rest " state." commentaries on classics is drawn " process of offset Q1 and Q2 " saturated " and " amplification " state, it is exactly instrumentation tubes " handing-over " process to " signal amplification task ", and the operating state of offset is by exciting current I1 and I2 decision, irrelevant with the residing state of instrumentation tubes, visible this accurate Class A bias mode is " from initiatively " bias mode.This point is different fully with " passive type " or " its biasing " mode of traditional accurate kind circuit." new Class A " circuit said above for example and just belong to " its biasing " mode, promptly the constant pressure source with other is biased in certain state with final stage.The characteristics of " from initiatively " bias mode are exactly the fidelity height, have stopped " pollution " of other interference signal fully.
For the circuit of Fig. 3 and Fig. 4, when static state, when exciting current I1 and I2 certain, the β value one of Q1, Q2, Q3, Q4 regularly, the quiescent current of final stage has just been determined, can not have been regulated.And in inactive state, Q1, Q2 offset are subjected to the influence of " the β value is different ", one is in magnifying state, another is in saturation condition, and can not all be in magnifying state, because at this moment the handing-over of " signal amplification task " is not to finish in the junction of positive-negative half-cycle signal, but finish in signal half one.
For the problems referred to above, can be between the emitter of offset and base stage and a resistance, make the base stage of resistance and offset provide bias current to instrumentation tubes simultaneously, thus increase final stage quiescent current, as shown in Figure 5.At this moment suppose that Q1 is in magnifying state, Q2 is saturated, and two kinds of situations occur: 1. reduce the R1 value, R2 is constant, the final stage quiescent current is strengthened, R1 remains unchanged, and reduces the resistance of R2, and the final stage quiescent current is constant, only reducing to R2 makes Q2 be in magnifying state, at this moment reduce the value of R2 again, can make the final stage quiescent current become big, but at this moment Q1 can become saturation condition by magnifying state.2. increase the R1 value, R2 is constant, and Q3, Q4 quiescent current are reduced, and is in saturation condition up to Q1, increases the R1 resistance again, and Q3, Q4 quiescent current are constant, but the time Q2 pipe can become magnifying state.If the value of the constant increase of R1 R2, quiescent current is not handed over.
If Q1 is in saturation condition, Q2 is in magnifying state, adjusts the resistance of R1 and R2, can obtain identical rule.
Know from last surface analysis, adjusting is in the offset parallel resistance value of magnifying state, can regulate the final stage quiescent current, reduce saturated offset parallel resistance value, can make offset become magnifying state by saturation condition, because at this moment passed through from resistance, thereby allowed offset be in magnifying state by the unnecessary electric current of saturated pipe base stage.
For above-mentioned said base-current bias quasi-first-kind circuit, final stage has only one-level complementary pair pipe to amplify output, needed promotion electric current is very big, in fact range of application is very little, now can adopt following circuit, see Fig. 6, promptly final stage is amplified output by multistage complementary pair pipe, and each is setovered each utmost point complementary pair pipe by the one-level biasing circuit.Its principle and effect and one-level biasing circuit are duplicate, and only needed promotion electric current is very little, and fan-out capability is bigger, and current amplification factor equals the product of each utmost point multiplication factor.In fact pre-amplification circuit uses one-level, in power amplifier, generally uses two-stage, seldom uses three grades, surpasses three grades unused at all.
Fig. 6 is more complete base-current bias quasi-first-kind circuit basic principle figure.As long as 1～3 grade that gets wherein connects different inputs and promotes circuit, just can constitute the accurate class A amplifier of various better performances.
As shown in Figure 7, this circuit is application example of the present invention (one).
This circuit is very simple, but performance is very good.The first order is two difference input circuits, constant biasing, and mirror current source is done load, is characterized in that output impedance is few, good linearity, frequency response is wide.The second level is cascode---common-base circuit, has improved linearity and frequency response greatly, and the third level is a triode output circuit in parallel, adopts base-current bias quasi-first-kind circuit of the present invention, makes final stage switch and intermodulation distortion not occur.What need emphasize is that the voltage-stabiliser tube of the collector electrode series connection of offset and three diodes are in order to reduce the collection of offset---emitter voltage, the influence that the b-c junction capacitance caused when the commentaries on classics of eliminate bias state was drawn.The correct voltage drop value of selecting voltage-stabiliser tube and diode makes offset all be in slight saturation condition, can eliminate the influence of b-c junction capacitance, can guarantee that again end efferent duct extremely in parallel changes the mild transition of positive-negative half-cycle signal when drawing synchronously, and it is best that its effect will reach.If voltage-stabiliser tube and diode are drawn into the Vbe multiplier, use more convenient.
As shown in Figure 8, this circuit is an application example of the present invention (two).
Promptly be used in the integrated transporting discharging.In integrated operational amplifier, as long as final stage adopts the circuit of Fig. 8, every index will improve.
As shown in Figure 9, this circuit is an application example of the present invention (three).
The maximum characteristics of this circuit are that final stage adopt not to have big ring negative feedback type, prime and push away for voltage Moving. The first order is rhombus double input circuit, and distortion is few, and speed is fast. The second level is emitter following Device carries out Hyblid Buffer Amplifier, reduces the burden of prime and linearity and the frequency response that improves rear level, and the third level is The voltage amplification utmost point, the fourth stage are two-stage base current biasing circuit, adopt the base current offset, make the end Switch and intermodulation distortion do not appear in level. The common voltage amplifier stage that forms of first, second and third level. The fourth stage Gain 0dB is a voltage follower. The characteristics of this circuit are that comprehensive distortion is more negative than general no big ring Feedback circuit is much lower, and sense of hearing is also finer. In addition, the colelctor electrode of final stage offset has sealed in V The be multiplier, the voltage-stabiliser tube in the replacement in the example and diode use easily. Offset is transferred full And state, its performance will be better, because heat endurance also will obtain basic assurance. Just circuit slightly Little complexity a bit. In addition, the final stage efferent duct has removed emitter resistance, and its is gone here and there at colelctor electrode In, as other usefulness. Eliminated the voltage distortion that this resistance causes. And other accurate kind circuit This resistance can not be omitted, because save this resistance, the final stage electric current can't accurately be controlled, and will be thermally-stabilised Property also can not be guaranteed, and this also is a big advantage of this circuit.
Claims (5)
1, a kind of base-current bias quasi-first-kind circuit comprises that biasing circuit and signal amplify efferent duct, is characterized in that: base current biasing triode Q1, Q2 constitute the biasing circuit of accurate kind circuit; Q3, Q4 are that signal amplifies efferent duct; The base stage of base current biasing triode Q1 connects the base stage that signal amplifies efferent duct Q3, the base stage of base current biasing triode Q2 connects the base stage that signal amplifies efferent duct Q4, the collector electrode of the collector electrode of base current biasing triode Q1 and base current biasing triode Q2 links, and constitutes the biasing circuit of accurate kind circuit; The emitter that signal amplifies efferent duct Q3, Q4 links, and constitutes the complementary output circuit; Excitation bias current I1 and I2 import from the emitter of base current biasing triode Q1, Q2 respectively; The collector electrode that signal amplifies efferent duct Q3, Q4 connects positive-negative power respectively, and the contact that the emitter of signal amplification efferent duct Q3 and signal amplify the emitter of efferent duct Q4 is an output.
2, base-current bias quasi-first-kind circuit according to claim 1 is characterized in that: connects an adjusting resistance R 1, R2 respectively between the emitter of described base current biasing triode Q1, Q2 and base stage.
3, base-current bias quasi-first-kind circuit according to claim 1 is characterized in that: at the inter-collector serial connection step-down source E1 of described base current biasing triode Q1, Q2.
4, base-current bias quasi-first-kind circuit according to claim 3 is characterized in that: described step-down source E1 is voltage-stabiliser tube, diode, resistance, Vbe multiplier or complementary type Vbe multiplier.
5, according to claim 1 or 2 or 3 described base-current bias quasi-first-kind circuits, it is characterized in that: described base-current bias quasi-first-kind circuit is that one-level is to multistage complete symmetrical complement amplification output circuit, each level complementary symmetrical amplifying circuit is fully respectively setovered by one-level base current offset circuit, their annexation is: the emitter of the signal amplification efferent duct of the complete complementary amplifying circuit of previous stage connects the emitter of back one-level biasing circuit respectively, and the contact that the emitter of the signal amplification efferent duct of the complete complementary symmetrical amplifying circuit of the last grade links is as the load of output termination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97106048A CN1066592C (en) | 1997-08-18 | 1997-08-18 | Base-current bias quasi-first-kind circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97106048A CN1066592C (en) | 1997-08-18 | 1997-08-18 | Base-current bias quasi-first-kind circuit |
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| CN1177862A CN1177862A (en) | 1998-04-01 |
| CN1066592C true CN1066592C (en) | 2001-05-30 |
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| CN97106048A Expired - Fee Related CN1066592C (en) | 1997-08-18 | 1997-08-18 | Base-current bias quasi-first-kind circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105591626A (en) * | 2014-10-21 | 2016-05-18 | 广州南洋理工职业学院 | DC-free bias power amplifier circuit |
| CN105811961B (en) * | 2016-03-04 | 2019-01-22 | 广州时艺音响科技有限公司 | A kind of high-power FET complementary output circuit of no source resistance |
| CN107196610B (en) * | 2017-05-11 | 2020-11-10 | 中国科学院微电子研究所 | Switching power amplifier |
| CN109358692A (en) * | 2018-10-24 | 2019-02-19 | 北京无线电测量研究所 | A kind of low-dropout regulator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4313065A (en) * | 1978-12-21 | 1982-01-26 | Sony Corporation | Switching circuit with MOS field effect transistor |
| CN1068225A (en) * | 1991-06-29 | 1993-01-20 | 卢华云 | The quasi-class A bias circuit of complementary push-pull output device |
-
1997
- 1997-08-18 CN CN97106048A patent/CN1066592C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4313065A (en) * | 1978-12-21 | 1982-01-26 | Sony Corporation | Switching circuit with MOS field effect transistor |
| CN1068225A (en) * | 1991-06-29 | 1993-01-20 | 卢华云 | The quasi-class A bias circuit of complementary push-pull output device |
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| CN1177862A (en) | 1998-04-01 |
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