CN205430183U

CN205430183U - Intercom audio power amplifier circuit

Info

Publication number: CN205430183U
Application number: CN201620283447.9U
Authority: CN
Inventors: 陈启明
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-07
Filing date: 2016-04-07
Publication date: 2016-08-03
Anticipated expiration: 2026-04-07

Abstract

The utility model discloses an intercom audio power amplifier circuit, including electric capacity C1, resistance R1, triode VT1, diode D1, triode VT2 and electric capacity C2, incoming signal vi is connected to electric capacity C1 one end, ground resistance R1 and triode VT1 base are connected respectively to the electric capacity C1 other end, triode VT2 projecting pole and resistance R4 are connected respectively to triode VT1 projecting pole, the resistance R4 other end is connecting resistance R8 respectively, triode VT7 collecting electrode and triode VT6 collecting electrode, diode D1 negative pole and triode VT7 base are connected respectively to the resistance R8 other end, triode VT6 base and resistance R7 are connected respectively to triode VT7 projecting pole, triode VT6 projecting pole is connecting resistance R5 respectively, triode VT5 projecting pole, resistance R9 and output vo. The utility model provides an adopting a plurality of triodes to join in marriage an intercom audio power amplifier circuit of rc -component design, comparing the amplifier circuit who adopts the operational amplifier design, the loss is low, and stability is high.

Description

A kind of intercom audio amplifier circuit

Technical field

The utility model relates to a kind of amplifying circuit, specifically a kind of intercom audio amplifier circuit.

Background technology

Intercom is as a kind of outstanding Wireless Telecom Equipment, internal amplifier is requisite, in order to realize the noise reduction of intercom and the power output improving intercom etc. reason, power amplifier is the Key Circuit module in intercom radio frequency front end chip, is also the part of power consumption in whole chip.In the radio frequency front end chip supporting multiple communication standard, power amplifier needs, under consuming few power consumption premise, to carry high-power amplification efficiency as far as possible, prior art or circuit are complicated, and power consumption is few, or circuit is simple, power consumption is many, and amplification efficiency is the highest.The utility model provides a kind of and uses multiple triode to join an intercom audio amplifier circuit for Resistor-Capacitor Unit design, is lost low, and stability is high.

Utility model content

The purpose of this utility model is to provide a kind of intercom audio amplifier circuit, with the problem solving to propose in above-mentioned background technology.

For achieving the above object, the following technical scheme of the utility model offer:

nullA kind of intercom audio amplifier circuit，Including electric capacity C1、Resistance R1、Triode VT1、Diode D1、Triode VT2 and electric capacity C2，Described electric capacity C1 one end connects input signal Vi，The electric capacity C1 other end connects earth resistance R1 and triode VT1 base stage respectively，Triode VT1 emitter stage connecting triode VT2 emitter stage and resistance R4 respectively，The resistance R4 other end connects resistance R8 respectively、Triode VT7 colelctor electrode and triode VT6 colelctor electrode，The resistance R8 other end connects diode D1 negative pole and triode VT7 base stage respectively，Triode VT7 emitter stage connecting triode VT6 base stage and resistance R7 respectively，Triode VT6 emitter stage connects resistance R5 respectively、Triode VT5 emitter stage、Resistance R9 and output end vo，The resistance R9 other end connects ground capacity C3，Resistance R5 other end connecting triode VT2 base stage，Triode VT5 base stage connects the resistance R7 other end and triode VT4 emitter stage respectively，Triode VT4 base stage connects resistance R6 respectively、Triode VT3 colelctor electrode and electric capacity C2，The resistance R6 other end connects diode D1 positive pole，Triode VT3 emitter stage connects resistance R4，Triode VT3 base stage connects the electric capacity C2 other end respectively、Triode VT1 colelctor electrode and resistance R2，The resistance R2 other end connects resistance R3 respectively、The resistance R4 other end、Triode VT4 colelctor electrode、Triode VT5 colelctor electrode and power supply VCC，Resistance R3 other end connecting triode VT2 colelctor electrode.

As the utility model further scheme: described power supply VCC voltage is 5V.

Compared with prior art, the beneficial effects of the utility model are: the utility model provides a kind of and uses multiple triode to join an intercom audio amplifier circuit for Resistor-Capacitor Unit design, compares the amplifying circuit using Design of Amplifiers, is lost low, and stability is high.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of intercom audio amplifier circuit.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the utility model rather than whole embodiments.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of the utility model protection.

nullRefer to Fig. 1，In the utility model embodiment，A kind of intercom audio amplifier circuit，Including electric capacity C1、Resistance R1、Triode VT1、Diode D1、Triode VT2 and electric capacity C2，Described electric capacity C1 one end connects input signal Vi，The electric capacity C1 other end connects earth resistance R1 and triode VT1 base stage respectively，Triode VT1 emitter stage connecting triode VT2 emitter stage and resistance R4 respectively，The resistance R4 other end connects resistance R8 respectively、Triode VT7 colelctor electrode and triode VT6 colelctor electrode，The resistance R8 other end connects diode D1 negative pole and triode VT7 base stage respectively，Triode VT7 emitter stage connecting triode VT6 base stage and resistance R7 respectively，Triode VT6 emitter stage connects resistance R5 respectively、Triode VT5 emitter stage、Resistance R9 and output end vo，The resistance R9 other end connects ground capacity C3，Resistance R5 other end connecting triode VT2 base stage，Triode VT5 base stage connects the resistance R7 other end and triode VT4 emitter stage respectively，Triode VT4 base stage connects resistance R6 respectively、Triode VT3 colelctor electrode and electric capacity C2，The resistance R6 other end connects diode D1 positive pole，Triode VT3 emitter stage connects resistance R4，Triode VT3 base stage connects the electric capacity C2 other end respectively、Triode VT1 colelctor electrode and resistance R2，The resistance R2 other end connects resistance R3 respectively、The resistance R4 other end、Triode VT4 colelctor electrode、Triode VT5 colelctor electrode and power supply VCC，Resistance R3 other end connecting triode VT2 colelctor electrode；Described power supply VCC voltage is 5V.

Operation principle of the present utility model is: refer to Fig. 1, input signal Vi carries out voltage amplification through C1 to the differential input amplifier being made up of VT1 and VT2, signal after amplification takes out from the colelctor electrode of VT1, send driver triode VT3 to carry out excitation to amplify, pumping signal is taken out from the colelctor electrode of VT3, two-way is divided to export: underarm PNP multiple tube ground level (VT7 ground level) of the complementary push-pull amplifying circuit that a road send VT6 and VT7 to form through R6, D1, when signal is negative half period, multiple tube turns on, signal exports from output end vo, multiple tube cut-off when signal is positive half cycle；The NPN multiple tube (VT4 ground level) that VT4 and VT5 forms directly is sent on another road, and when signal is positive half cycle, multiple tube turns on, and signal exports from output end vo, and signal negative half period ends；Audio signal after amplification is exported by the emitting stage of VT5, VT6.

C2 is vibrationproof electric capacity, the high-frequency self-excitation being likely to occur for rejective amplifier, and C2 is again the neutralizing capacitance of VT3, or negative-feedback electric capacity, lag compensation electric capacity, can reduce the high-frequency gain of VT3, destroy the amplitude versus frequency characte of self-excitation, resistance R9, electric capacity C/3 form a capacitive load, become the impedance compensation circuit of output end vo, in order to compensate for the induction reactance composition of output end vo load, make amplifier operation stable, being difficult to self-excitation, output stage transistor is difficult to overvoltage occur, running and comparing safety.

It is obvious to a person skilled in the art that the utility model is not limited to the details of above-mentioned one exemplary embodiment, and in the case of without departing substantially from spirit or essential attributes of the present utility model, it is possible to realize the utility model in other specific forms.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than described above, it is intended that all changes fallen in the implication of equivalency and scope of claim included in the utility model.Should not be considered as limiting involved claim by any reference in claim.

In addition, it is to be understood that, although this specification is been described by according to embodiment, but the most each embodiment only comprises an independent technical scheme, this narrating mode of specification is only for clarity sake, specification should can also be formed, through appropriately combined, other embodiments that it will be appreciated by those skilled in the art that as an entirety, the technical scheme in each embodiment by those skilled in the art.

Claims

null1. an intercom audio amplifier circuit，Including electric capacity C1、Resistance R1、Triode VT1、Diode D1、Triode VT2 and electric capacity C2，It is characterized in that，Described electric capacity C1 one end connects input signal Vi，The electric capacity C1 other end connects earth resistance R1 and triode VT1 base stage respectively，Triode VT1 emitter stage connecting triode VT2 emitter stage and resistance R4 respectively，The resistance R4 other end connects resistance R8 respectively、Triode VT7 colelctor electrode and triode VT6 colelctor electrode，The resistance R8 other end connects diode D1 negative pole and triode VT7 base stage respectively，Triode VT7 emitter stage connecting triode VT6 base stage and resistance R7 respectively，Triode VT6 emitter stage connects resistance R5 respectively、Triode VT5 emitter stage、Resistance R9 and output end vo，The resistance R9 other end connects ground capacity C3，Resistance R5 other end connecting triode VT2 base stage，Triode VT5 base stage connects the resistance R7 other end and triode VT4 emitter stage respectively，Triode VT4 base stage connects resistance R6 respectively、Triode VT3 colelctor electrode and electric capacity C2，The resistance R6 other end connects diode D1 positive pole，Triode VT3 emitter stage connects resistance R4，Triode VT3 base stage connects the electric capacity C2 other end respectively、Triode VT1 colelctor electrode and resistance R2，The resistance R2 other end connects resistance R3 respectively、The resistance R4 other end、Triode VT4 colelctor electrode、Triode VT5 colelctor electrode and power supply VCC，Resistance R3 other end connecting triode VT2 colelctor electrode.
Intercom audio amplifier circuit the most according to claim 1, it is characterised in that described power supply VCC voltage is 5V.