CN202334443U

CN202334443U - Amplifier capable of being directly coupled

Info

Publication number: CN202334443U
Application number: CN2011204674113U
Authority: CN
Inventors: 刘稼涛; 詹宝驹; 杜嘉晖
Original assignee: CHENGDU JUTAO NETWORK TECHNOLOGY Co Ltd
Current assignee: CHENGDU JUTAO NETWORK TECHNOLOGY Co Ltd
Priority date: 2011-11-23
Filing date: 2011-11-23
Publication date: 2012-07-11
Anticipated expiration: 2021-11-23

Abstract

The utility model discloses an amplifier capable of being directly coupled. The amplifier comprises a coupling circuit, wherein the coupling circuit comprises a first triode, a second triode, a fourth resistor, a fifth resistor and a second capacitor, wherein the collector electrode of the first triode is connected with the base electrode of the second triode through the second capacitor; two ends of the fourth resistor are respectively connected with the base electrode of the second triode and the positive electrode of a power supply; and two ends of the fifth resistor are respectively connected with the base electrode of the second triode and a grounding wire. The amplifier disclosed by the utility model has the advantages of simple structure, low power consumption, convenience for use, high amplification factor, capability of being overlapped, favorable stability, wide application range and suitability for various electronic devices.

Description

A kind of can direct-coupled amplifier

Technical field

The utility model relates to a kind of amplifier, more relate to a kind of can direct-coupled amplifier.

Background technology

The common emitter AC amplifier is being widely used in various electronic equipments; The voltage amplification factor of sort circuit is high, working stability; But often the multiplication factor of one-level amplifier not enough, use very several amplifiers, but this amplifier need superpose through being of coupled connections; Complex structure often, consumed power is big.

Summary of the invention

The purpose of the utility model with regard to be to provide in order to address the above problem a kind of simple in structure, consumed power is little, can direct-coupled amplifier.

The utility model is realized above-mentioned purpose through following technical scheme:

The utility model comprises coupling circuit; Said coupling circuit comprises first triode, second triode, the 4th resistance, the 5th resistance and second electric capacity; The collector electrode of said first triode is connected with the base stage of said second triode through said second electric capacity; The two ends of said the 4th resistance are connected with positive source with the base stage of said second triode respectively, and the two ends of said the 5th resistance are connected with earth connection with the base stage of said second triode respectively.

The utility model also comprises first resistance, second resistance, the 3rd resistance, the 7th resistance, first electric capacity and the 4th electric capacity; The two ends of said first electric capacity connect the base stage and the signal input part of said first triode respectively; The two ends of said first resistance are connected with positive source with the base stage of said first triode respectively; The two ends of said second resistance are connected with earth connection with the base stage of said first triode respectively; The collector electrode of said first triode is connected with positive source through said the 3rd resistance; The emitter of said first triode is connected with earth connection through said the 7th resistance, and the emitter of said first triode also is connected with earth connection through the 4th electric capacity.

The utility model also comprises the 6th resistance, the 8th resistance, the 3rd electric capacity and the 5th electric capacity; The two ends of said the 6th resistance are connected with positive source with the collector electrode of said second triode respectively; The two ends of said the 8th resistance are connected with earth connection with the emitter of said second triode respectively; The two ends of said the 3rd electric capacity are connected with signal output part respectively at the collector electrode of said second triode, and the two ends of said the 5th electric capacity are connected with earth connection with the emitter of said second triode respectively.

The beneficial effect of the utility model is:

The utility model is simple in structure, consumed power is little, easy to use, multiplication factor is high, can superpose, and has good stable property, is widely used, and is applicable to each electronic equipment.

Description of drawings

Accompanying drawing is the circuit structure schematic diagram of the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further:

Shown in accompanying drawing: the utility model comprises coupling circuit; Said coupling circuit comprises the first triode BG1, the second triode BG2, the 4th resistance R 4, the 5th resistance R 5 and second capacitor C 2; The collector electrode of the first triode BG1 is connected with the base stage of the second triode BG2 through second capacitor C 2; The two ends of the 4th resistance R 4 are connected with positive source with the base stage of the second triode BG2 respectively, and the two ends of the 5th resistance R 5 are connected with earth connection with the base stage of the second triode BG2 respectively.

Shown in accompanying drawing: the utility model also comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 7th resistance R 7, first capacitor C 1 and the 4th capacitor C 4; The two ends of first capacitor C 1 connect base stage and the signal input part of the first triode BG1 respectively; The two ends of first resistance R 1 are connected with positive source with the base stage of the first triode BG1 respectively; The two ends of second resistance R 2 are connected with earth connection with the base stage of the first triode BG1 respectively; The collector electrode of the first triode BG1 is connected with positive source through the 3rd resistance R 3; The emitter of the first triode BG1 is connected with earth connection through the 7th resistance R 7, and the emitter of the first triode BG1 also is connected with earth connection through the 4th capacitor C 4.

Shown in accompanying drawing: the utility model also comprises the 6th resistance R 6, the 8th resistance R 8, the 3rd capacitor C 3 and the 5th capacitor C 5; The two ends of the 6th resistance R 6 are connected with positive source with the collector electrode of the second triode BG2 respectively; The two ends of the 8th resistance R 8 are connected with earth connection with the emitter of the second triode BG2 respectively; The two ends of the 3rd capacitor C 3 are connected with signal output part respectively at the collector electrode of the second triode BG2, and the two ends of the 5th capacitor C 5 are connected with earth connection with the emitter of the second triode BG2 respectively.

Shown in accompanying drawing: this figure is a dual-stage amplifier; Be to lean on second capacitor C 2, the 4th resistance R 4 and the 5th resistance R 5 to publish in instalments together between the dual-stage amplifier; This connection is called resaistance-capacity coupling circuit; Second electric capacity can be sent to the back utmost point to the alternating current output signal of pre-amplifier, and cuts off the direct voltage of the front and back utmost point; The 4th resistance R 4, the 5th resistance R 5 are base electrode bias resistances of the second triode BG2, in order to give the second triode BG2 stable base stage bias current are provided, and these two resistance are absolutely necessary.

Shown in accompanying drawing: the utility model is all fairly simple from design and adjustment, therefore is of wide application.It links together the first triode BG1 and the second triode BG2, and this amplifier has the higher voltage multiplication factor, and the working point is very stable again, is that the common emitter amplifier with high voltage multiplication factor constitutes, so multiplication factor must be high; Secondly, owing to saved base electrode bias resistance, the signal code of the collector electrode output of the first triode BG1 all flows into the base stage of the second triode BG2, and signal code is loss not, so can obtain higher current amplification factor.

The utility model working stability is because be added with the cause of two-stage direct current negative-feedback circuit; The base stage bias current of the first triode BG1 is not to take from power supply, but takes from the emitter of the second triode BG2 through first resistance R 1, and this has just constituted two-stage direct current negative-feedback circuit; Its feedback procedure is; If the collector current of the first triode BG1 is increased, then can cause chain reaction, collector current is received pin down and remained unchanged basically; Thereby having guaranteed the working point quite stable of direct-coupled amplifier, this is an outstanding advantage of direct coupled amplifier.

Claims

One kind can direct-coupled amplifier; It is characterized in that: comprise coupling circuit; Said coupling circuit comprises first triode, second triode, the 4th resistance, the 5th resistance and second electric capacity; The collector electrode of said first triode is connected with the base stage of said second triode through said second electric capacity; The two ends of said the 4th resistance are connected with positive source with the base stage of said second triode respectively, and the two ends of said the 5th resistance are connected with earth connection with the base stage of said second triode respectively.
2. according to claim 1 a kind of can direct-coupled amplifier; It is characterized in that: also comprise first resistance, second resistance, the 3rd resistance, the 7th resistance, first electric capacity and the 4th electric capacity; The two ends of said first electric capacity connect the base stage and the signal input part of said first triode respectively; The two ends of said first resistance are connected with positive source with the base stage of said first triode respectively; The two ends of said second resistance are connected with earth connection with the base stage of said first triode respectively; The collector electrode of said first triode is connected with positive source through said the 3rd resistance, and the emitter of said first triode is connected with earth connection through said the 7th resistance, and the emitter of said first triode also is connected with earth connection through the 4th electric capacity.
3. according to claim 2 a kind of can direct-coupled amplifier; It is characterized in that: also comprise the 6th resistance, the 8th resistance, the 3rd electric capacity and the 5th electric capacity; The two ends of said the 6th resistance are connected with positive source with the collector electrode of said second triode respectively; The two ends of said the 8th resistance are connected with earth connection with the emitter of said second triode respectively; The two ends of said the 3rd electric capacity are connected with signal output part respectively at the collector electrode of said second triode, and the two ends of said the 5th electric capacity are connected with earth connection with the emitter of said second triode respectively.