CN206673917U - A kind of digital audio power amplification circuit for color ultrasound - Google Patents

Abstract

The utility model discloses a kind of digital audio power amplification circuit for color ultrasound of amplifying circuit technical field,Including No. 1 input positive pole port,No. 1 input positive pole port series resistor R1,The other end of the resistance R1 is simultaneously connected to diode Q1 positive poles,No. 1 input port of diode Q2 negative poles and biasing circuit modules A,Row buffering is entered to input stage by triode T3,The structure can improve the input impedance of intergrade simultaneously,Reduce the load effect to input stage,Resistance R11 is triode T3 emitting stage negative feedback resistor,The stability of temperature can not only be improved,Steady operation electric current,And also leakage effects,Be advantageous to releasing for triode T3 base charge,C5 is miller compensation electric capacity,Primarily serve frequency compensated effect,The circuit structure is simple,It is easy to use,There is supplementary function to frequency,Reduce distortion probability.

Description

A kind of digital audio power amplification circuit for color ultrasound

Technical field

Amplifying circuit technical field is the utility model is related to, specially a kind of digital audio power for color ultrasound amplifies electricity Road.

Background technology

Color ultrasound is exactly briefly that the black-and-white B of fine definition adds color Doppler, using Doppler effect principle, When having relative motion between sound source and receiving body (i.e. probe and reflector), the frequency of echo changes, such a frequency Change is referred to as frequency displacement, and B ultrasound includes pulse Doppler, continuous-wave doppler and color doppler image.At present, B in medical field Super developing direction is exactly color ultrasound, and power amplification circuit is commonly used in color ultrasound equipment, and existing power amplification circuit is mostly Simulation scale-up circuit, and distortion, than more serious, linear effects are bad, and obtained result is less desirable, and circuit is complicated, power It is low, carry out many difficulties to color ultrasound detection band, therefore, I proposes a kind of digital audio power amplification circuit for color ultrasound.

Utility model content

The purpose of this utility model is to provide a kind of digital audio power amplification circuit for color ultrasound, above-mentioned to solve The problem of complex designing and more serious distortion ratio of the existing power amplification circuit proposed in background technology.

To achieve the above object, the utility model provides following technical scheme：A kind of digital audio power for color ultrasound Amplifying circuit, including No. 1 input positive pole port, No. 1 input positive pole port series resistor R1, the other end of the resistance R1 And No. 1 input port of diode Q1 positive poles, diode Q2 negative poles and biasing circuit modules A is connected to, the diode Q1's is negative Pole and No. 2 input ports for being connected to resistance R2, diode Q2 positive poles and biasing circuit modules A, the other end string of the resistance R2 No. 1 input negative pole port is connect, 3, No. 4 output ports of the biasing circuit modules A concatenate middle amplification circuit module B's respectively 2 and No. 1 input ports, No. 4 output ports concatenation fuse FU of the middle amplification circuit module B, the fuse FU's Other end concatenation limiting protector L No. 1 port, No. 3 output ports concatenation current-limiting protection of the middle amplification circuit module B Device L No. 2 ports, 3 and No. 4 ports of the limiting protector L concatenate No. 1 output negative pole port and No. 1 output cathode respectively Port.

Preferably, the biasing circuit modules A includes A input positive poles port, the A input positive poles port serial capacitance C1, the electric capacity C1 other end and connecting resistance R3, triode T1 base stage and electric capacity C2, the other end of the resistance R3 simultaneously connect Resistance R4, resistance R5 and VCC, the other end of the resistance R4 simultaneously meet triode T1 colelctor electrode and triode T2 base stage, institute State the resistance R5 other end and connect the another of triode T2 emitter stage and resistance R6, the resistance R6 other end serial capacitance C2 One end, the emitter stage of the triode T1 and connecting resistance R7 and electric capacity C3, the other end of the resistance R7 and electric capacity C3 and meet A Negative pole port, ground wire, resistance R8, resistance R9 and A output negative pole port are inputted, the other end of the resistance R8 simultaneously meets triode T2 Colelctor electrode and electric capacity C4, the electric capacity C4 the other end and connecting resistance R9 the other end and A output cathodes port.

Preferably, the middle amplification circuit module B includes B input positive poles port, the B input positive poles port concatenation electricity Hold C5, the other end of the electric capacity C5 and connecting resistance R10 and triode T3 base stage, the other end of the resistance R10 simultaneously connects three Pole pipe T3 colelctor electrode and VCC, the emitter stage and connecting resistance R11 and electric capacity C6 of the triode T3, the resistance R11's is another Hold and connect B input negative poles port, ground wire and B output negative poles port, the other end concatenation B output cathodes port of the electric capacity C6.

Preferably, the fuse FU is fastp-acting fuse.

Compared with prior art, the beneficial effects of the utility model are：It is fastp-acting fuse by fuse FU, can be in pole Larger overload current is born in short time, have quick fuse ability, to circuit carry out short-circuit protection, using resistance R1, R2 and diode Q1, Q2 carry out certain limitation to the input signal of circuit, make in the case where input signal is excessive, Bu Huiying The normal work of whole circuit is rung, reverse-biased using triode T1 and T2 emitter stage positively biased, colelctor electrode, accomplishing without distortion will letter Number voltage amplification, enters row buffering to input stage by triode T3, while the structure can improve the input impedance of intergrade, reduces To the load effect of input stage, resistance R11 is triode T3 emitting stage negative feedback resistor, can not only improve the steady of temperature Qualitative, steady operation electric current, and also leakage effects, the base charge for being advantageous to triode T3 is released, and C5 is that Miller is mended Electric capacity is repaid, primarily serves frequency compensated effect, the circuit structure is simple, easy to use, there is supplementary function to frequency, reduces and loses True probability.

Brief description of the drawings

Fig. 1 is the utility model circuit diagram；

Fig. 2 is the utility model biasing circuit modules A circuit diagram；

Fig. 3 is amplification circuit module B circuit diagrams among the utility model.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belong to the scope of the utility model protection.

Fig. 1-3 are referred to, the utility model provides a kind of technical scheme：A kind of digital audio power for color ultrasound amplifies Circuit, including No. 1 input positive pole port, No. 1 input positive pole port series resistor R1, the other end of the resistance R1 simultaneously connect There is No. 1 input port of diode Q1 positive poles, diode Q2 negative poles and biasing circuit modules A, the negative pole of the diode Q1 is simultaneously No. 2 input ports of resistance R2, diode Q2 positive poles and biasing circuit modules A are connected to, the other end of the resistance R2 concatenates No. 1 Negative pole port is inputted, 3, No. 4 output ports of the biasing circuit modules A concatenate the 2 and 1 of middle amplification circuit module B respectively Number input port, No. 4 output ports concatenation fuse FU of the middle amplification circuit module B, the fuse FU's is another End concatenation limiting protector L No. 1 port, No. 3 output ports concatenation limiting protector L of the middle amplification circuit module B No. 2 ports, 3 and No. 4 ports of the limiting protector L concatenate No. 1 output negative pole port and No. 1 output cathode end respectively Mouthful.

Wherein, the biasing circuit modules A includes A input positive poles port, and the A inputs positive pole port serial capacitance C1, The other end and connecting resistance R3, triode T1 base stage and electric capacity C2 of the electric capacity C1, the other end of the resistance R3 simultaneously connect electricity R4, resistance R5 and VCC are hindered, the other end of the resistance R4 simultaneously connects triode T1 colelctor electrode and triode T2 base stage, described The resistance R5 other end simultaneously meets the another of triode T2 emitter stage and resistance R6, the resistance R6 other end serial capacitance C2 End, the emitter stage of the triode T1 and connecting resistance R7 and electric capacity C3, the other end of the resistance R7 and electric capacity C3 are and to meet A defeated Enter negative pole port, ground wire, resistance R8, resistance R9 and A output negative pole port, the other end of the resistance R8 simultaneously connects triode T2's Colelctor electrode and electric capacity C4, the electric capacity C4 other end and connecting resistance the R9 other end and A output cathodes port, the centre are put Big circuit module B includes B input positive poles port, and the B inputs positive pole port serial capacitance C5, and the other end of the electric capacity C5 is simultaneously Connecting resistance R10 and triode T3 base stage, the other end of the resistance R10 and the colelctor electrode and VCC for meeting triode T3, described three Pole pipe T3 emitter stage and connecting resistance R11 and electric capacity C6, the other end of the resistance R11 and connect B input negative poles port, ground wire and B output negative poles port, the other end concatenation B output cathodes port of the electric capacity C6, the fuse FU are fastp-acting fuse, energy Larger overload current is born in very short time, the ability with quick fuse, short-circuit protection is carried out to circuit.

Operation principle：Certain limitation is carried out to the input signal of circuit using resistance R1, R2 and diode Q1, Q2, made In the case where input signal is excessive, do not interfere with the normal work of whole circuit, using triode T1 and T2 emitter stage just Partially, colelctor electrode is reverse-biased, accomplishes without distortion to amplify signal voltage, enters row buffering to input stage by triode T3, simultaneously should Structure can improve the input impedance of intergrade, reduce the load effect to input stage, and resistance R11 is triode T3 emitting stage Negative feedback resistor, the stability of temperature, steady operation electric current, and also leakage effects can be not only improved, are advantageous to three poles Pipe T3 base charge is released, and C5 is miller compensation electric capacity, primarily serves frequency compensated effect, and the circuit structure is simple, It is easy to use, there is supplementary function to frequency, reduce distortion probability.

While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art, It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.

Claims (4)

1. a kind of digital audio power amplification circuit for color ultrasound, including No. 1 input positive pole port, it is characterised in that：Described 1 Number input positive pole port series resistor R1, the other end of the resistance R1 and be connected to diode Q1 positive poles, diode Q2 negative poles and No. 1 input port of biasing circuit modules A, the negative pole of the diode Q1 are simultaneously connected to resistance R2, diode Q2 positive poles and biasing Circuit module A No. 2 input ports, the other end of the resistance R2 concatenate No. 1 input negative pole port, the biasing circuit module A 3, No. 4 output ports concatenate middle amplification circuit module B 2 and No. 1 input ports, the middle amplifying circuit mould respectively Block B No. 4 output ports concatenation fuse FU, the fuse FU other end concatenation limiting protector L No. 1 port, institute State middle amplification circuit module B No. 3 output ports concatenation limiting protector L No. 2 ports, 3 Hes of the limiting protector L No. 4 ports concatenate No. 1 output negative pole port and No. 1 output cathode port respectively.

A kind of 2. digital audio power amplification circuit for color ultrasound according to claim 1, it is characterised in that：It is described inclined Circuits modules A includes A input positive poles port, and the A inputs positive pole port serial capacitance C1, and the other end of the electric capacity C1 is simultaneously Connecting resistance R3, triode T1 base stage and electric capacity C2, the resistance R3 other end and connecting resistance R4, resistance R5 and VCC, it is described The resistance R4 other end simultaneously connects triode T1 colelctor electrode and triode T2 base stage, and the other end of the resistance R5 simultaneously connects three poles The other end of pipe T2 emitter stage and resistance R6, the resistance R6 other end serial capacitance C2, the transmitting of the triode T1 Pole and connecting resistance R7 and electric capacity C3, the other end of the resistance R7 and electric capacity C3 and connect A input negative poles port, ground wire, resistance R8, resistance R9 and A output negative pole port, the other end of the resistance R8 and the colelctor electrode and electric capacity C4 for meeting triode T2, it is described The electric capacity C4 other end and the connecting resistance R9 other end and A output cathodes port.

A kind of 3. digital audio power amplification circuit for color ultrasound according to claim 1, it is characterised in that：In described Between amplification circuit module B include B inputs positive pole port, the B inputs positive pole port serial capacitance C5, and the electric capacity C5's is another Hold simultaneously connecting resistance R10 and triode T3 base stage, the other end of the resistance R10 and the colelctor electrode and VCC for meeting triode T3, institute State triode T3 emitter stage and connecting resistance R11 and electric capacity C6, the other end of the resistance R11 and connect B inputs negative pole port, Line and B output negative poles port, the other end concatenation B output cathodes port of the electric capacity C6.

A kind of 4. digital audio power amplification circuit for color ultrasound according to claim 1, it is characterised in that：It is described molten Disconnected device FU is fastp-acting fuse.