CN203193572U - Low-voltage driving integrated amplifier for automobile control circuit - Google Patents
Low-voltage driving integrated amplifier for automobile control circuit Download PDFInfo
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- CN203193572U CN203193572U CN 201220267229 CN201220267229U CN203193572U CN 203193572 U CN203193572 U CN 203193572U CN 201220267229 CN201220267229 CN 201220267229 CN 201220267229 U CN201220267229 U CN 201220267229U CN 203193572 U CN203193572 U CN 203193572U
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Abstract
Provided is a low-voltage driving integrated amplifier for automobile control circuit, comprising a difference amplifier input terminal of an input triode and a second triode, an intermediate amplifying stage and an output terminal. A signal is fed back from an output terminal to a base electrode of the second triode in the difference amplifier through a negative feedback circuit. Current source is input with triode collector circuit in the difference amplifier and is input in the intermediate amplifier triode, and is connected as a load. The current source will have deviation due to separated bias voltage, and thereby stability can be improved. The bias voltage of the intermediate amplifying stage current source will also generate a bias voltage in a feedback circuit. A running circuit is connected to the bias power source at the stage of intermediate gain, providing self-starting for the current source. The amplifier is stabilized by a frequency compensation terminal based on the base electrode and the collector electrode of the intermediate amplifier triode. A gain control resistor connected to the base electrode of a differential stage second triode works through changing negative feedback in the amplifier.
Description
Technical field
This invention relates to a kind of low voltage drive integrated amplifier for automotive control circuit, low level, a small-power, the high-gain amplifier that can directly be coupled and can work under low-down supply power voltage voltage.Amplifier is particluarly suitable for using in onboard wireless audio frequency apparatus and the hearing aids.
Background technology
Equipment as onboard wireless audio frequency apparatus, hearing aids and so on needs a high-gain amplifier, and it can be worked under 1 volt to 1.5 volts single power supply.In addition, owing to can only hold extremely little space in the hearing aids, amplifier should be able to be realized by single-chip, and needed the least possible external module.Single-chip is realized needing direct-coupled amplifier, because needed big electric capacity can not be realized by single-chip in the AC coupled.Directly coupling has increased constraint with utmost point low suppling voltage for design, namely never can have the emitter junction of two series connection triodes to connect with power supply, because the voltage drop sum of two emitter junctions can be close to supply voltage.
With regard to these restraining factors, the design of the high-gain integrated circuit direct coupled amplifier of a kind equipment that is applicable to hearing aids is a difficult task.Topmost problem is its stability in this class A amplifier A, especially a part of working as output signal sends back to input as negative feedback and brings in (the gain control of control multiplication factor, can be said to is a feedback oscillator control, often is used in this class device of picture hearing aids).Because stability problem, in the prior art, it is possible having only the feedback oscillator control range of a restriction, and this is a serious drawback.
Summary of the invention
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, can be under the hold amplifier stable case, can under accepting reaction type gain control, be operated in one on a large scale in.Amplifier among the present invention has typically comprised three grades, is respectively a differential amplifier stage with an input triode and second triode, interstage amplifier section and the output stage with the 3rd triode.Signal feeds back to second triode of differential levels from output stage, by a feedback circuit, for amplifier provides negative feedback.In embodiments, current source is connected with the load of the 3rd triode as first, and provides biasing to improve stability by independent bias voltage.In this embodiment, in feedback circuit, the bias voltage of the 3rd triode also can provide biasing to current source, and the circuit of an operation is connected with the bias supply of the 3rd triode.It is for stabilizing amplifier that the frequency compensation element is connected with the input of the 3rd triode.Amplifier Gain can change in certain scope by the negative feedback that changes on second triode, can not cause any instability.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, its first tie point is applicable to an end that is connected to battery, and second tie point is applicable to the other end that is connected to battery.Differential levels has the first and second NPN triodes, and each triode respectively has a base stage, an emitter and a collector electrode, and the emitter of first and second triodes connects together.Amplifying stage comprises the 3rd NPN triode with a base stage, an emitter and a collector electrode.Output comprises the 4th NPN triode with a base stage, an emitter and a collector electrode.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, the input biasing circuit of its first triode, the input biasing circuit comprises that an end is connected to first resistance and second end of first transistor base, second resistance is connected between second end and first tie point of first resistance, the 5th NPN triode has a base stage, an emitter and a collector electrode, the emitter collector electrode of the 3rd resistance and the 5th triode is connected between second end and second tie point of first resistance, and base stage and the collector electrode of the 5th triode connect together.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, its port that is connected to first transistor base is in order to receive an amplifying signal.Emitter and second tie point that end connects first, second triode takes place in electric current.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, its first current source load end is connected to the output of first triode, first current source load one and is had a base stage, an emitter and a collector electrode, the emitter of the 6th triode is connected to first tie point, and the collector electrode of the 6th triode is connected to the collector electrode of first triode.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, its first offset side is biased in the 6th triode, first offset side is the 7th a PNP triode with a base stage, an emitter and a collector electrode, the emitter of the 7th triode is connecting first tie point, the collector electrode of the 7th triode is connecting the collector electrode of second triode, and ground level and the collector electrode of the 7th triode connect together.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, the collector electrode of its first triode is connecting the base stage of the 3rd triode.The second current source load end is different from the first current source load end, is connecting the collector electrode of the 3rd triode, and when electric current flow to first and second tie points from battery, the second current source load end was started working.The collector electrode of the 3rd triode is connecting the base stage of the 4th triode.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, the signal of its negative feedback port feedback part from the emitter of the 4th triode to second transistor base, the negative feedback port comprises:
A. a series of tie points comprise: the 8th a NPN triode with a base stage, an emitter and a collector electrode, base stage and the collector electrode of the 8th triode link together, the 4th resistance and the 8th triode polyphone.Serial interface one end is connected to the emitter of the 4th triode.
B. the 5th resistance is connected an end and second tie point of serial interface, in order to shift the direct current level of feedback signal.
C. the 3rd current source load end is different from the first current source load end, and first end is connected to first port, and second end is connected to the other end of series termination mouth.
D. the 6th resistance is connected the base stage of second triode and second end of the 3rd current source load end, and when electric current flow to first and second tie points from battery, the 3rd current source load end was started working.
E. the frequency compensation end is connecting the base stage of the 3rd triode, and for stabilizing amplifier, the compensation end has a series resistance and electric capacity.
F. the base stage of second triode is separated with the base stage of first triode at the orthogonal flow port in essence.
G. feed back weak end, comprise second electric capacity and the weak resistance of feedback, be connected in the middle of the base stage and second tie point of second triode.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, its first resistance is above 20000 ohm.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, it feeds back weak resistance and can change for the negative feedback resistance that changes in the differential amplifier.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, its frequency compensation end is connected between the base stage and collector electrode of the 3rd triode.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, its 3rd current source load end is a resistance.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, its the second and the 3rd current source load end is respectively that a base stage is respectively arranged, the the 9th and the tenth PNP triode of an emitter and a collector electrode, the 9th links to each other with first tie point with the emitter of the tenth triode, the collector electrode of the 9th triode is connected with collector electrode with the 3rd triode, the collector electrode of the tenth triode is connected with the 3rd current source load end second end, the bias terminal of the 9th and the tenth triode, bias terminal comprises that has a base stage, the 11 PNP triode of a collector electrode and an emitter, the emitter of the 11 triode with link to each other with first tie point, the collector electrode of the 11 triode links together with base stage and is connected with the base stage of the tenth triode with the 9th, and electric current end takes place the collector electrode of the 11 triode is connected with second tie point.
The invention provides a kind of low voltage drive integrated amplifier for automotive control circuit, end takes place its electric current is the 12 a NPN triode that has a base stage, an emitter and a collector electrode, the collector electrode of the base stage of the 12 triode and the 5th triode links together, the collector electrode of the 12 triode and the collector electrode of the 11 triode link together, and the emitter of the 12 triode and second tie point link together.
Description of drawings
What Fig. 1 circuit showed is a direct current amplifier under the low voltage drive under the prior art.
Fig. 2 is a foundation amplifier circuit figure of the present invention.
Fig. 3 has shown the resistance value corresponding with Fig. 2 circuit gain.
Fig. 4 has shown improved frequency compensation element in Fig. 2 circuit.
Fig. 5 has shown further improved frequency compensation element in Fig. 2 circuit.
Fig. 6 has shown the extra starting resistance had in Fig. 2 circuit and along with the changeable gain controlling resistance in position.
Fig. 7 has shown the form behind Fig. 2 circuit modification.
Specific embodiments
In description, the corresponding reference number of Fig. 1 circuit is represented corresponding part drawing, and this has shown the available circuit figure that has serious drawback to discuss, and Fig. 2 has shown that a basis has inventive circuit figure now.Yet apostrophe is used to component-bar chart 1 part identical with Fig. 2.In addition, external module, for example these are not assembled into the device of an integrated circuit part, mark with asterisk in Fig. 1 and Fig. 2.The value of distinctive components and parts is labeled in the other bracket of assembly in two circuit.
Below general description relevant with Fig. 2 circuit, but also be applicable to Fig. 1.Shown in describing, Fig. 2 circuit receives input signal Vin from input translator 2.This signal is exaggerated in three series-connected stage amplifying stages 4,6,8, has the amplifying signal of this generation to be passed to load end Z.The energy of amplifier provides the positive pole of voltage vcc and negative pole to represent with the ground connection form from a single battery (not providing).
Amplifier first amplifying stage 4 is differential levels that not only provided high-gain but also described differential feedback loop is provided.Level 4 comprises two triode Q1 and Q2, and their emitting stage connects together and passes through resistance R 4 ground connection.The current collection level electric current of triode Q3 provides by the diode that is connected to triode Q8.The current collection level electric current of triode Q2 is provided by the current source that is made of triode Q7, as the active load of triode Q2.This has produced a very high voltage gain in triode Q2.The current source that is made of triode Q7 provides biasing by Q8.
Input signal Vin feeds back to the base stage of triode Q2 by an extra capacitor C 1.Triode Q2 is made up of with R3 resistance R 1 by one and provides biasing with the circuit of the diode series connection that is being connected triode Q1, and resistance R 2 is connected between resistance R 1 and R3 tie point and the triode Q2 ground level.Resistance R 2 arranges the input impedance of amplifier effectively.
Input signal Vin is amplified (triode Q2 has a high voltage gain) by the triode Q2 on the level 4.Amplifying signal feeds back to second amplifying stage 6 from the collector electrode of triode Q2, and specific is ground level to partial triode Q5.A pay(useful) load end that is made of current source triode Q10 is connected on the collector loop of triode Q5 so that high voltage gain to be provided.Triode Q10 provides biasing (in Fig. 1 circuit, triode Q11 ' provides biasing by a diode that is connected on the triode Q4 ', and this is the part in the negative feedback loop, will be described) by the diode that is connected in Fig. 2 circuit on the triode Q11.
Amplifying signal on the collector electrode of triode Q5 is fed back on the base stage of triode Q6 of 3 grades or output stage 8.Triode Q6 provides extra magnification ratio.Load Z links to each other to receive consequent signal with the collector electrode of triode Q6.
Negative feedback is by providing from the signal through sampling on the triode Q6 emitter, be connected in triode Q4 and be worth the size that an amount of diode changes DC potential by one, and by resistance R 6, R8 (resistance R 6 ' is separately in Fig. 1 circuit) will transform the base stage that good signal is delivered to triode Q3.
Fig. 1 circuit has a series of important disadvantages.A main shortcoming is exactly that Fig. 1 circuit cannot receive the interior reaction type gain control of a wide scope.When using such control and gain to change very among a small circle in, unsteadiness (vibration) has produced, the loop gain frequency of the closed loop gain that shows this amplifier during greater than the phase shift generation of spending at 180.Undistorted volume control is impossible in Fig. 1 circuit widely.The charged road of Fig. 1 also has further shortcoming, will mention soon.
Fig. 2 circuit several important aspect difference and Fig. 1 circuit, this circuit has overcome above mentioned shortcoming.Main difference, concise and to the point point is introduced, and comprises following aspect:
Current source triode Q9 provides biasing separately by the diode that is connected on the triode Q11, rather than as providing biasing by triode Q8 ' among Fig. 1.This has several important results, will be described soon.
The required extra starting resistance Rs of Fig. 1 circuit is eliminated, and a self-start-up circuit is provided, will describe below.
The frequency compensation element is resistance R 9 and capacitor C 3, and being added in a certain location is in base stage-collector circuit of triode Q5.
Above-mentioned 1～3 characteristics have made an additional stable reaction type gain control that is made of resistance R vc be made for possibility.
Difference between other two circuit will be described in detail the back in above four characteristics and explain.
Q9 independently setovers between triode, will be in sight in Fig. 1, and triode Q9 ' provides biasing by triode Q8 '.
Find in Fig. 1 circuit, have one by the feedback endless-chain of dotted line 12 signs through after the extensive investigations.This feedback loop is from triode Q8 ', and through base stage-collector circuit of triode Q9 ', the base stage-collector circuit through resistance R 6 ' and triode Q3 ' is restored to triode Q8 at last.Feedback loop shows positive feedback under the situation of most of frequencies and gain combination, thereby causes the amplifier instability.The triode Q9 owing to setover separately, feedback control loop is destroyed.
Fortunately, although bias source Q8 and Q11 separate in Fig. 2 circuit, they often relate to triode Q1.Triode Q1, and resistance R 1, R3 set all direct currents in the amplifier.In fact, the direct current in triode Q2, Q3, Q4, Q5, Q7, Q8, Q9, Q10, Q11, Q12 is all set by triode Q1.Yet reference source triode Q1 is isolated by the AC signal of big impedance, so current source Q7 and Q9 are independently from the angle of ac small signal.Also be independently from angle bias supply Q8 and the Q11 of ac small signal.From the angle of ac small signal, independently be bias supply Q8 and the Q11 that describes mutual isolation.
The independent biasing of triode Q9 allows additional self-start circuit in Fig. 2 amplifier.Self-start circuit is made of the base stage that resistance R 3 and triode Q1 intersection point are connected to a new triode Q12.Collector electrode-emitter circuit of triode Q12 is connected with the diode of the triode Q11 that ins succession under supply power voltage.Under this arrangement, when power on circuitry, the electric current that flows through triode Q1 will cause that the electric current that flows through Q12 is determined with the ratio of Q12 emitter area by Q1.When triode Q12 conducting, also during conducting, current source Q9 will connect triode Q11, and the A point voltage also will increase.The voltage that the A point increases can make triode Q3 conducting, biasing is provided for the triode Q8 of making current source triode Q7, starts triode Q2 simultaneously.
Fig. 2 self-start circuit can be eliminated outside starting resistance Rs in Fig. 1 circuit, and this is former need to make current source work in circuit.The elimination of resistance R s has several advantages.At first, the feedback loop represented of with dashed lines 16 chains is by resistance R s.Feedback loop 16 all is normal negative feedback basically, but forwards the base stage of triode Q2 ' to by resistance R 5 ' and Rs.Feedback loop is positive under the situation of most of frequencies and gain combination.This causes the amplifier instability, though have only very limited scope in circuit diagram 1, capacitor C 2 ' is as an ac short circuit ground connection of loop 16.Yet, if in Fig. 1 circuit, use the feedback oscillator controlling resistance to come ride gain by the negative feedback that changes on the triode Q3 ' base stage, this gain controlling resistance should with Fig. 1 in point 17 and the capacitor C 2 ' between the R5 ' connect.Resistance between point 17 and capacitor C 2 ' hinders the gain that capacitor C 2 ' reduces feedback loop 16, and this will cause the instability of amplifier.Resistance R s removes by guaranteeing that triode Q2, Q3 base stage a little are separated from each other this problem of having eliminated with exchanging substantially.(the interchange tie point between two points refers to that on AC signal from a point, for example the base stage of triode Q3 can arrive other point, and for example the base stage of triode Q2 does not have great variation in a stage.)
Secondly, starting resistance Rs's removes the certain limitation of having eliminated amplifier input impedance.Hearing aid amplifier has high input impedance, and this is desirable, because if the input impedance corresponding with transducer output impedance is not high in hearing aids, sizable signal attenuation will occur so.The output impedance of a typical hearing aids transducer is 3,3k, if the input impedance of amplifier is 7k, will cause about 30% attenuated input signal, and this needs higher amplifier gain.Input impedance in Fig. 1 and 2 circuit approximately is the resistance value of resistance R 2, and resistance value is 7k in Fig. 1 circuit.In Fig. 1 circuit, the value of resistance R 2 is owing to the pressure drop of passing resistance R 2 and Rs can be so greatly to avoid transistor Q3 work not to be restricted.In Fig. 2 circuit, because resistance R s is removed, resistance R 2 can improve the resistance of resistance and a selected 27k by demand, has almost turned over the input impedance of two kinds of amplifiers.In Fig. 2 circuit resistance R 2 resistances usually minimum be 20k.
In addition, starting resistance Rs removes the quantity that has reduced the amplifier outer member, is an important consideration in application such as for example hearing aids.
About frequency compensation element R9 and C3, in the evolution of Fig. 2 circuit, can find in circuit, to have about 37 pole and zeros, each can cause that the frequency shift phase shift reaches 90 degree.This will cause powerful instability problem, because whenever the total phase shift of amplifier loop gain is 180 degree during greater than the loop gain of a phase shift, (and true often take place) will take place in vibration.Yet, it is found that the unsteadiness of base stage-collector circuit of transistor Q5 can be overcome at a certain location pull-in frequency compensating element.Select capacitor C 3 to make it the high frequency response of rejective amplifier, provide enough broadbands (in the hearing aids use, 150 to 8khz bandwidth is normally enough) for stable feedback operation in such a way.The collector-base of capacitor C 3 connects and adopts the Miller effect increasing effective capacitance, so capacitor C 3 is enough little of to integrate present silicon technology.This has further reduced outer member quantity, and this is important feature in the hearing aid amplifier.
In Fig. 1 circuit two feedback control loops 12,16 damage and frequency compensation element R9, C3 in place, can find that reaction type gain control can use in Fig. 2 circuit.Resistance R vc provides control, and Rvc connects with capacitor C 2 and resistance R 5 and receives the base stage of triode Q3.Because the impedance of resistance R vc reduces, to the negative feedback decay of triode Q3 base stage, this has increased the net gain of amplifier.It is found that resistance R vc resistance changes between 100k ohm at 10 ohm, with the variation that almost is inversely proportional to that gains, as shown in Figure 3.Reaction type gain control is very favourable, because it has allowed a gain control on a large scale not influencing under the situation that peak power output is provided under the low distortion.In Fig. 1 circuit, when gain control is used in gain reduction usually (distributor is placed in the signal pathway), this has confused the direct current situation, has also reduced the maximum under the low distortion and can obtain power.In some cases, adopt feedback-type gain control in Fig. 1 circuit, by the variable resistor of a 100k of placement between capacitor C 2 and C3, but this can confuse the direct current situation significantly, and large deformation also only just can take place under appropriate attenuation.
Fig. 1 and the further difference of Fig. 2 circuit are in Fig. 2 circuit, and current source triode Q10 is a lateral PNP triode, and triode Q5 is a vertical NPN triode (comprising n type extension).In Fig. 1 circuit, triode Q5 ' is the PNP triode, and current source triode Q10 ' is a NPN triode.Different is, the current gain of vertical NPN device is than high many of lateral PNP device.Typical β=150 of vertical NPN device, Comparatively speaking the lateral PNP device is 30.Therefore, the voltage gain at the triode Q2 in the 4th stage has increased by 2 to 5 times.The open-loop gain of Fig. 2 amplifier is than high many of Fig. 1 amplifier, and this causes in the closed loop gain supply power voltage or device parameter dependence still less.
Two 80 millivolt 40 millivolts of being reduced in Fig. 2 circuit of DC potential from Fig. 1 circuit that the further difference of circuit is resistance R 7 tops.In Fig. 2 circuit, the associating pressure drop of resistance R 7 and R8 is 80 millivolts, but in fact because R7 part resistance is transferred on the resistance R 8, the pressure drop by resistance R 7 reduces.Therefore, when triode Q6 was driven difficultly, the saturation voltage of collector electrode was compared with Fig. 1 circuit triode Q6 ' and has been reduced 80 millivolts.This has increased undistorted opereating specification.Maximum output voltage swing increases by 160 millivolts usually, and it is that Vcc is 1,55V that maximum output voltage increases by 13%.
It is found that outer member minimum in Fig. 2 circuit will produce about 72 decibels closed loop gain, volume control range is generally 42 decibels, and almost the change in resistance with resistance R vc is inversely proportional to.Because high input impedance, Fig. 2 circuit is coordinated mutually with the hearing aids transducer, also is used in 500 to 5000 ohm load.Because the stability of built-in circuit, self-start circuit is very sensitive to cell voltage and changes in resistance, can operate in surpassing 1.0 to 1.6 volts battery voltage range usually.
What need emphasize is that to design in a circuit according to the invention be very crucial.With regard to all 37 pole and zeros of circuit, each all can cause phase shift variations when frequency shift, even minimum variation will cause instability in the circuit configuration.Components values in the application and the characteristic of input pickup and load can be done some suitable modifications, select the value of resistance R 7 so that a suitable output offset electric current to be provided, and the value of resistance R 7 depends on load.Yet, have been found that current source triode Q9 and Q10 from current source triode Q7 separately biasing to come out be important.This has destroyed above-mentioned feedback loop 12 at least, also provides a simple complete self-start circuit for amplifier.Simultaneously find that also the input that the frequency compensation element is connected to triode Q5 is absolutely necessary; Or on the optional position of mentioning, can cause unsteadiness.
If desired, as shown in Figure 4, frequency compensation element R9 " and C3 " expression, can be placed between the base stage and ground of triode Q5.This does not have the arranged availability height of Fig. 2 circuit, because capacitor C 3 " with present technology is integrated may be bigger than normal.Yet Fig. 4 circuit is arranged in Fig. 2 circuit and keeps stability still can provide enough compensation down, because drive source (triode Q2) can experience the inhibition of impedance.In Fig. 1 circuit, frequency compensation (through capacitor C 3 ") is provided in triode Q6 ' base stage, but it has been found triode Q5 dominant pole is provided in circuit, must occur in the input of this triode in the stable prerequisite lower frequency compensation of circuit.
As shown in Figure 5, frequency compensation also can the combination of resistance R 9 and capacitor C 3 provides resistance R 9 between triode Q5 base stage and the collector electrode by being connected " and capacitor C 3 " be connected between triode Q5 and the ground.
If desired, some other variation can also be arranged in Fig. 2 circuit.For example, triode Q12 and it can be cancelled with lead on the triode Q1, and triode Q12 can be by a simple resistance replacement of connecting with triode Q11.Yet arranged setting is more rational.In addition, resistance R s can be inserted again, shown in Fig. 6 circuit, as long as capacitor C 2 is connected on the ac short circuit between feedback control loop 16 and the ground.When using resistance R s, shown in Fig. 6 circuit, it helps the conducting of triode Q3.As long as there is not effective resistance to be connected with capacitor C 2 between feedback control loop 16 and ground, the gain of feedback control loop 16 is still so low, and the instability that this loop causes is restricted.As long as resistance R s does not change, although have certain difficulty with regard to its big resistance, it can be combined.Yet though Fig. 2 circuit is first-selected, because the interpolation of resistance R s is not required by the circuit operation in Fig. 6 circuit, resistance R s constitutes an extra assembly and one and can keep in the impedance of capacitor C 2 and its lead causing instability under the lower level.In addition, the existence of resistance R s has increased the constraint of resistance R 2 values.
The place that can further make an amendment may be current source Q9, and Q10 can be by resistance R 10, and R11 substitutes respectively, as shown in Figure 7.Resistance R 10, R11 can the place of current source as high impedance load, and do not need to be biased.Fig. 7 circuit is identical except this with Fig. 2 circuit, is also removed together with turn-on transistor Q12 except bias supply Q11 certainly.Fig. 7 circuit still can self-starting, and the positive feedback in Fig. 1 circuit still can be cancelled, and it still needs suitable frequency compensation to come holding circuit stable operation.Yet, Fig. 2 circuit is more rational, because it has slight open-loop gain, takies less chip area (because resistance R 10 and R11 occupy sizable area), resistance R 10 and R11 must be very big in Fig. 7 circuit, so it takies more area in the low circuit version.
Claims (7)
1. low voltage drive integrated amplifier that is used for automotive control circuit is characterized in that:
(1) first tie point is applicable to an end that is connected to battery, and second tie point is applicable to the other end that is connected to battery; Differential levels has the first and second NPN triodes, and each triode respectively has a base stage, an emitter and a collector electrode, and the emitter of first and second triodes connects together; Amplifying stage comprises the 3rd NPN triode with a base stage, an emitter and a collector electrode; Output comprises the 4th NPN triode with a base stage, an emitter and a collector electrode;
The input biasing circuit of (2) first triodes, the input biasing circuit comprises that an end is connected to first resistance and second end of first transistor base, second resistance is connected between second end and first tie point of first resistance, the 5th NPN triode has a base stage, an emitter and a collector electrode, the emitter collector electrode of the 3rd resistance and the 5th triode is connected between second end and second tie point of first resistance, and base stage and the collector electrode of the 5th triode connect together;
(3) port that is connected to first transistor base is in order to receive an amplifying signal, and emitter and second tie point that end connects first, second triode takes place electric current;
(4) first current source load ends are connected to the output of first triode, first current source load one and is had a base stage, an emitter and a collector electrode, the emitter of the 6th triode is connected to first tie point, and the collector electrode of the 6th triode is connected to the collector electrode of first triode;
(5) first offset sides are biased in the 6th triode, first offset side is the 7th a PNP triode with a base stage, an emitter and a collector electrode, the emitter of the 7th triode is connecting first tie point, the collector electrode of the 7th triode is connecting the collector electrode of second triode, and ground level and the collector electrode of the 7th triode connect together;
The collector electrode of (6) first triodes is connecting the base stage of the 3rd triode, the second current source load end, be different from the first current source load end, the collector electrode that is connecting the 3rd triode, when electric current flows to first and second tie points from battery, the second current source load end is started working, and the collector electrode of the 3rd triode is connecting the base stage of the 4th triode;
(7) signal of a negative feedback port feedback part from the emitter of the 4th triode to second transistor base, the negative feedback port comprises:
A. a series of tie points comprise: the 8th a NPN triode with a base stage, an emitter and a collector electrode, base stage and the collector electrode of the 8th triode link together, the 4th resistance and the 8th triode polyphone, serial interface one end is connected to the emitter of the 4th triode;
B. the 5th resistance is connected an end and second tie point of serial interface, in order to shift the direct current level of feedback signal;
C. the 3rd current source load end is different from the first current source load end, and first end is connected to first port, and second end is connected to the other end of series termination mouth;
D. the 6th resistance is connected the base stage of second triode and second end of the 3rd current source load end, and when electric current flow to first and second tie points from battery, the 3rd current source load end was started working;
E. the frequency compensation end is connecting the base stage of the 3rd triode, and for stabilizing amplifier, the compensation end has a series resistance and electric capacity;
F. the base stage of second triode is separated with the base stage of first triode at the orthogonal flow port in essence;
G. feed back weak end, comprise second electric capacity and the weak resistance of feedback, be connected in the middle of the base stage and second tie point of second triode.
2. a kind of low voltage drive integrated amplifier for automotive control circuit according to claim 1, it is characterized in that: first resistance is above 20000 ohm.
3. a kind of low voltage drive integrated amplifier for automotive control circuit according to claim 1 is characterized in that: feed back weak resistance and can change for the negative feedback resistance that changes in the differential amplifier.
4. a kind of low voltage drive integrated amplifier for automotive control circuit according to claim 1, it is characterized in that: the frequency compensation end is connected between the base stage and collector electrode of the 3rd triode.
5. a kind of low voltage drive integrated amplifier for automotive control circuit according to claim 1, it is characterized in that: the 3rd current source load end is a resistance.
6. a kind of low voltage drive integrated amplifier for automotive control circuit according to claim 1, it is characterized in that: the second and the 3rd current source load end is respectively that a base stage is respectively arranged, the the 9th and the tenth PNP triode of an emitter and a collector electrode, the 9th links to each other with first tie point with the emitter of the tenth triode, the collector electrode of the 9th triode is connected with collector electrode with the 3rd triode, the collector electrode of the tenth triode is connected with the 3rd current source load end second end, the bias terminal of the 9th and the tenth triode, bias terminal comprises that has a base stage, the 11 PNP triode of a collector electrode and an emitter, the emitter of the 11 triode with link to each other with first tie point, the collector electrode of the 11 triode links together with base stage and is connected with the base stage of the tenth triode with the 9th, and electric current end takes place the collector electrode of the 11 triode is connected with second tie point.
7. a kind of low voltage drive integrated amplifier for automotive control circuit according to claim 6, it is characterized in that: end takes place electric current is the 12 a NPN triode that has a base stage, an emitter and a collector electrode, the collector electrode of the base stage of the 12 triode and the 5th triode links together, the collector electrode of the 12 triode and the collector electrode of the 11 triode link together, and the emitter of the 12 triode and second tie point link together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220267229 CN203193572U (en) | 2012-06-07 | 2012-06-07 | Low-voltage driving integrated amplifier for automobile control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220267229 CN203193572U (en) | 2012-06-07 | 2012-06-07 | Low-voltage driving integrated amplifier for automobile control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203193572U true CN203193572U (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220267229 Expired - Lifetime CN203193572U (en) | 2012-06-07 | 2012-06-07 | Low-voltage driving integrated amplifier for automobile control circuit |
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| Country | Link |
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| CN (1) | CN203193572U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694511A (en) * | 2012-06-07 | 2012-09-26 | 李志鹏 | Low-voltage driven integrated circuit amplifier for vehicle control circuit |
| CN109802654A (en) * | 2019-02-15 | 2019-05-24 | 广东寰宇电子科技股份有限公司 | A kind of high AC impedance circuit and its application system |
| CN112953414A (en) * | 2021-03-19 | 2021-06-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Pixel-level amplifier circuit |
-
2012
- 2012-06-07 CN CN 201220267229 patent/CN203193572U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694511A (en) * | 2012-06-07 | 2012-09-26 | 李志鹏 | Low-voltage driven integrated circuit amplifier for vehicle control circuit |
| CN109802654A (en) * | 2019-02-15 | 2019-05-24 | 广东寰宇电子科技股份有限公司 | A kind of high AC impedance circuit and its application system |
| CN112953414A (en) * | 2021-03-19 | 2021-06-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Pixel-level amplifier circuit |
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