CN103701456A - Power amplifier external interface circuit - Google Patents
Power amplifier external interface circuit Download PDFInfo
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- CN103701456A CN103701456A CN201310746697.2A CN201310746697A CN103701456A CN 103701456 A CN103701456 A CN 103701456A CN 201310746697 A CN201310746697 A CN 201310746697A CN 103701456 A CN103701456 A CN 103701456A
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Abstract
The invention discloses a power amplifier external interface circuit. A triode Q2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4 are connected, and an internal circuit and an external output port of the power amplifier external interface circuit are effectively isolated by using the breakover characteristic of the triode, so that the interface internal circuit is well protected, reverse threshold voltage is improved through the triode and an input divider resistor, the security of the power amplifier external interface circuit can be effectively protected, external disturbance is effectively prevented, the reliability of the power amplifier external interface circuit can be improved, and circuit security is ensured.
Description
Technical field
The present invention relates to interface circuit technical field, particularly relate to a kind of power amplifier external interface circuit.
Background technology
On mobile communication power amplifier product, power amplifier externally has multiple external interface circuit, comprises enable circuits, alarm indicator circuit, alarm output circuit, address input control circuit, testing circuit in place.Power amplifier is in producing debugging and engineering application, and its port is easily subject to electrostatic influence, the impact of undesirable level and wherein various external disturbance.This has just released higher requirement to the reliability of power amplifier port.
The input circuit using on power amplifier at present has two kinds: by single COMS(Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductors (CMOS)) pipe or single BJT(Bipolar Junction Transistor, double carrier transistor) pipe formation.Due to the inherent characteristic of COMS pipe, when making to be used as input circuit, easily by electrostatic breakdown, cause the inefficacy of power amplifier input circuit.When the input circuit that uses single BJT to form, the problem of electrostatic breakdown has solved, but because the ground level cut-in voltage of BJT pipe only has 0.7V left and right, be easy to be subject to the unlatching BJT of outside interference mistake to manage, cause power amplifier control logic mistake, in power amplifier, the reliability of power amplifier external interface is not high.
Summary of the invention
Based on this, be necessary that for power amplifier external interface in power amplifier, being easily subject to external interference causes the problem that reliability is not high, a kind of power amplifier external interface circuit that can effectively prevent that external interference reliability is higher is provided.
A power amplifier external interface circuit, comprises triode Q2, resistance R 1, resistance R 2, resistance R 3 and resistance R 4;
One end of described resistance R 1 is connected with the base stage of described triode Q2, the other end of described resistance R 1 is connected with one end of described resistance R 3, one end of described resistance R 2 connects with the one end of described resistance R 1 that is connected the base stage of described triode Q2, the equal ground connection of emitter of the other end of described resistance R 2 and described triode Q2, one end of described resistance R 4 is connected with the collector electrode of described triode Q2, the other end of described resistance R 4 connects the input port of actual required supply voltage, the other end of described resistance R 3 connects the supply voltage port of reserve quota, the tie point of described resistance R 1 and resistance R 3 is connected input signal mouth.
Above-mentioned power amplifier external interface circuit; by connecting between triode Q2, resistance R 1, resistance R 2, resistance R 3 and resistance R 4; further utilize the on state characteristic of triode that power amplifier external interface inside circuit circuit and external output port are effectively isolated; thereby well protect interface internal circuit; also by triode, improve reversion threshold voltage together with input divider resistance; can effectively protect power amplifier external interface circuit safety; when effectively preventing external interference, can also improve the reliability of power amplifier external interface circuit, guarantee circuit safety.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of one of them embodiment of power amplifier external interface circuit;
Fig. 2 is the wherein circuit diagram of another embodiment of power amplifier external interface circuit;
Fig. 3 is the wherein circuit diagram of another specific embodiment of power amplifier external interface circuit;
Fig. 4 is the circuit structure diagram of one of them specific embodiment of power amplifier external interface circuit.
Embodiment
As shown in Figure 1, a kind of power amplifier external interface circuit, comprises triode Q2, resistance R 1, resistance R 2, resistance R 3 and resistance R 4;
One end of described resistance R 1 is connected with the base stage of described triode Q2, the other end of described resistance R 1 is connected with one end of described resistance R 3, one end of described resistance R 2 connects with the one end of described resistance R 1 that is connected the base stage of described triode Q2, the equal ground connection of emitter of the other end of described resistance R 2 and described triode Q2, one end of described resistance R 4 is connected with the collector electrode of described triode Q2, the other end of described resistance R 4 connects the input port of actual required supply voltage, the other end of described resistance R 3 connects the supply voltage port of reserve quota, the tie point of described resistance R 1 and resistance R 3 is connected input signal mouth.
In the present embodiment, R1 and R2 series connection dividing potential drop are for improving the threshold level of input cut-in voltage, can also regulate switching levels by revising the resistance ratio of R1 and R2.R1 and R2 adopt the resistance value that can adopt between 200k Ω～80k Ω to increase the input impedance of input circuit in the present embodiment, thereby alleviate the impact of input front end series resistance on switching levels.Because the resistance value of R1 and R2 is larger, thereby the base current of Q2 is just relatively little when Q2 opens, and then the collector current of Q2 is also relatively little, under the environment such as variations in temperature, may cause effectively output low level of output, from increasing Q1, the base current of Q2 is played to the effect of amplification, guarantee that the collector electrode of Q2 has enough electric currents to make output output low level in any environment.Use two joint BJT pipes also input signal and output signal to be isolated, protected power amplifier internal circuit.The effect of R3 is to provide the function of drawing in input to input circuit; can select resistance R 3 resistances is 100 kilohms of big or small resistance; the power supply that can protect to a certain extent described supply voltage input port to connect; in concrete implementation process, the general use of power amplifier is 28V voltage; the power supply that described supply voltage input port connects can adopt 5V power supply; if human error has been inputted 28V voltage; the electric current of pouring into of 5V power end is (28V-5V)/100k Ω=0.23mA, can not cause damage to 5V power supply.The input signal mouth incoming level signal that external control main frame is connected by the tie point with described resistance R 1 and resistance R 3, the output signal port being connected by the collector electrode with described triode Q2 is again exported corresponding level signal, in this enforcement, described power amplifier external interface circuit adopts inverse gate Logic Circuit Design form, while being input as low level, be output as high level, be input as low height and be output as at ordinary times low level, input and be output as low level when unsettled.
In the present embodiment, input front end is series resistance not, can relatively reduce the value of R1 and R2, thereby guarantees that output voltage is enough low when Q2 opens, and wherein, the resistance of described resistance R 4 and R1 are on the identical order of magnitude.Described power amplifier external interface circuit adopts inverse gate Logic Circuit Design form, is output as high level while being input as low level, is input as low height and is output as at ordinary times low level, inputs and is output as low level when unsettled.
Above-mentioned power amplifier external interface circuit; by connecting between triode Q2, resistance R 1, resistance R 2, resistance R 3 and resistance R 4; further utilize the on state characteristic of triode that power amplifier external interface inside circuit circuit and external output port are effectively isolated; thereby well protect interface internal circuit; also by triode, improve reversion threshold voltage together with input divider resistance; can effectively protect power amplifier external interface circuit safety; when effectively preventing external interference, can also improve the reliability of power amplifier external interface circuit, guarantee circuit safety.
As shown in Figure 2, in an embodiment, described power amplifier external interface circuit, also comprises the triode Q1 being connected between described resistance R 1 and described triode Q2 therein; The collector electrode of described triode Q1 is connected with the supply voltage port of described reserve quota, and the base stage of described triode Q1 is connected with the unearthed one end of described resistance R 2, and the emitter of described triode Q1 is connected with the base stage of described triode Q2.
In the present embodiment, R1 and R2 series connection dividing potential drop are for improving the threshold level of input cut-in voltage, and the series connection of Q1 and Q2 also can improve the threshold level of input cut-in voltage to a certain extent, can also regulate switching levels by revising the resistance ratio of R1 and R2.R1 and R2 adopt the resistance value that can adopt between 200k Ω～80k Ω to increase the input impedance of input circuit in the present embodiment, thereby alleviate the impact of input front end series resistance on switching levels.Because the resistance value of R1 and R2 is larger, thereby the base current of Q2 is just relatively little when Q2 opens, and then the collector current of Q2 is also relatively little, under the environment such as variations in temperature, may cause effectively output low level of output, from increasing Q1, the base current of Q2 is played to the effect of amplification, guarantee that the collector electrode of Q2 has enough electric currents to make output output low level in any environment.Use two joint BJT pipes also input signal and output signal to be isolated, protected power amplifier internal circuit.The effect of R3 is to provide the function of drawing in input to input circuit; can select resistance R 3 resistances is 100 kilohms of big or small resistance; the power supply that can protect to a certain extent described supply voltage input port to connect; in concrete implementation process, the general use of power amplifier is 28V voltage; the power supply that described supply voltage input port connects can adopt 5V power supply; if human error has been inputted 28V voltage; the electric current of pouring into of 5V power end is (28V-5V)/100k Ω=0.23mA, can not cause damage to 5V power supply.The input signal mouth incoming level signal that external control main frame is connected by the tie point with described resistance R 1 and resistance R 3, the output signal port being connected by the collector electrode with described triode Q2 is again exported corresponding level signal, in this enforcement, described power amplifier external interface circuit adopts inverse gate Logic Circuit Design form, while being input as low level, be output as high level, be input as low height and be output as at ordinary times low level, input and be output as low level when unsettled.The resistance of R1 described in the present embodiment, R2, R3 can be selected between 200k Ω～80k Ω, and the resistance of the resistance of described R4 and described R1, R2, R3 matches.
As shown in Figure 3, in an embodiment, described power amplifier external interface circuit, also comprises resistance R 5 therein, and described resistance R 5 is series between the supply voltage port of described reserve quota and the collector electrode of described triode Q1.
In the present embodiment, in order further to reduce circuit power consumption, can increase the electric current of resistance R 5 restriction triode Q1 collector electrodes, reduce the power consumption of whole circuit, the resistance of R1 described in the present embodiment, R2, R3, R5 can be selected between 200k Ω～80k Ω, and the resistance of the resistance of described R4 and described R1, R2, R3, R5 matches.。
As shown in Figure 4, in an embodiment, described power amplifier external interface circuit, comprises the triode Q1 and the resistance R 5 that are connected between described resistance R 1 to R3 therein; One end of described resistance R 5 connects described input signal mouth, the other end of described resistance R 5 is connected with one end of described resistance R 3 and the base stage of described triode Q1 respectively, the emitter of described triode Q1 is connected with the supply voltage port of described reserve quota, and the collector electrode of described triode Q1 is connected with described resistance R 1.In the present embodiment; on state characteristic by triode is effectively isolated power amplifier external interface inside circuit circuit and external output port; thereby well protect interface internal circuit, also by triode, improve reversion threshold voltage together with input divider resistance.Can increase resistance R 5 and triode Q1 according to concrete actual needs, then the voltage of further adjusting resistance components and parts, forward logical circuit obtained.
Therein in an embodiment, described power amplifier external interface circuit, the supply voltage port of described reserve quota is 5V supply voltage port.In the present embodiment, in conjunction with actual needs, the supply voltage port of preferred described reserve quota is 5V supply voltage port.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (5)
1. a power amplifier external interface circuit, is characterized in that, comprises triode Q2, resistance R 1, resistance R 2, resistance R 3 and resistance R 4;
One end of described resistance R 1 is connected with the base stage of described triode Q2, the other end of described resistance R 1 is connected with one end of described resistance R 3, one end of described resistance R 2 connects with the one end of described resistance R 1 that is connected the base stage of described triode Q2, the equal ground connection of emitter of the other end of described resistance R 2 and described triode Q2, one end of described resistance R 4 is connected with the collector electrode of described triode Q2, the other end of described resistance R 4 connects the input port of actual required supply voltage, the other end of described resistance R 3 connects the supply voltage port of reserve quota, the tie point of described resistance R 1 and resistance R 3 is connected input signal mouth.
2. power amplifier external interface circuit according to claim 1, is characterized in that, also comprises the triode Q1 being connected between described resistance R 1 and described triode Q2; The collector electrode of described triode Q1 is connected with the supply voltage port of described reserve quota, and the base stage of described triode Q1 is connected with the unearthed one end of described resistance R 2, and the emitter of described triode Q1 is connected with the base stage of described triode Q2.
3. power amplifier external interface circuit according to claim 2, is characterized in that, also comprises resistance R 5, and described resistance R 5 is series between the supply voltage port of described reserve quota and the collector electrode of described triode Q1.
4. power amplifier external interface circuit according to claim 1, is characterized in that, also comprises the triode Q1 and the resistance R 5 that are connected between described resistance R 1 to R3; One end of described resistance R 5 connects described input signal mouth, the other end of described resistance R 5 is connected with one end of described resistance R 3 and the base stage of described triode Q1 respectively, the emitter of described triode Q1 is connected with the supply voltage port of described reserve quota, and the collector electrode of described triode Q1 is connected with described resistance R 1.
5. power amplifier external interface circuit according to claim 1 and 2, is characterized in that, the supply voltage port of described reserve quota is 5V supply voltage port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310746697.2A CN103701456A (en) | 2013-12-30 | 2013-12-30 | Power amplifier external interface circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310746697.2A CN103701456A (en) | 2013-12-30 | 2013-12-30 | Power amplifier external interface circuit |
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| CN103701456A true CN103701456A (en) | 2014-04-02 |
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| CN201310746697.2A Pending CN103701456A (en) | 2013-12-30 | 2013-12-30 | Power amplifier external interface circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109426292A (en) * | 2017-08-29 | 2019-03-05 | 华为技术有限公司 | Multiple feed circuit |
| CN109617381A (en) * | 2019-01-30 | 2019-04-12 | 无锡华大国奇科技有限公司 | Double mode isolation control circuit |
| CN114337222A (en) * | 2021-12-28 | 2022-04-12 | 深圳欧陆通电子股份有限公司 | Control circuit and device for server power supply signal |
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| CN1483927A (en) * | 2003-07-27 | 2004-03-24 | 东风汽车公司 | Ignition ejection driving system for single fuel electronic ejection engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109426292A (en) * | 2017-08-29 | 2019-03-05 | 华为技术有限公司 | Multiple feed circuit |
| CN109617381A (en) * | 2019-01-30 | 2019-04-12 | 无锡华大国奇科技有限公司 | Double mode isolation control circuit |
| CN109617381B (en) * | 2019-01-30 | 2024-03-22 | 无锡华大国奇科技有限公司 | Dual mode isolation control circuit |
| CN114337222A (en) * | 2021-12-28 | 2022-04-12 | 深圳欧陆通电子股份有限公司 | Control circuit and device for server power supply signal |
| CN114337222B (en) * | 2021-12-28 | 2024-02-02 | 深圳欧陆通电子股份有限公司 | Control circuit and device for server power supply signal |
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Application publication date: 20140402 |