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Voltage-controlled continuously adjustable attenuation circuit

An attenuation circuit and resistance technology, applied in the field of voltage-controlled continuously adjustable attenuation circuits, can solve the problems of overloading the power amplifier circuit, power supply drop, etc., and achieve the effect of simple circuit, high stability and good linearity.

Active Publication Date: 2017-02-01
JIANGSU LINYANG ENERGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the background technology, the present invention provides a voltage-controlled continuously adjustable attenuation circuit, which aims to solve the problem of power supply drop caused by overload of the power amplifier circuit when the power of the existing linear power supply is constant.

Method used

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  • Voltage-controlled continuously adjustable attenuation circuit
  • Voltage-controlled continuously adjustable attenuation circuit
  • Voltage-controlled continuously adjustable attenuation circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1, a voltage-controlled continuously adjustable attenuation circuit includes a monitoring power supply VCC, and it also includes a reverse fixed-value amplifier and an attenuation circuit. The monitoring power supply VCC is connected to a reverse fixed-value amplifier, and the reverse fixed-value amplifier The output terminal of the attenuation circuit is controlled by a sampling resistor, and the input signal terminal Vi of the voltage-controlled continuously adjustable attenuation circuit is connected to the output signal terminal Vo after passing through the attenuation circuit; the attenuation circuit includes a MOS transistor Q1 and attenuation resistors R1, R2, and R3, wherein : After the input signal terminal Vi is connected to the attenuation resistor R1, on the one hand, it is grounded after passing through the attenuation resistor R2, and on the other hand, it is connected to the drain of the MOS transistor Q1 through the attenuation resistor R3; the ...

Embodiment 2

[0019] Embodiment 2, a voltage-controlled continuously adjustable attenuation circuit as described in Embodiment 1, the reverse fixed-value amplifier includes sampling resistors R4, R5, triode Q2, collector resistor R6, emitter resistor R7, bias Resistors R9 and R10, wherein: the monitoring power supply VCC is connected to the collector of the triode Q2 through the collector resistor R6, and the collector of the triode Q2 is connected to the ground after the sampling resistors R5 and R4 are connected in series; the emitter of the triode Q2 passes through the emitter The resistor R7 is grounded; the monitoring power supply VCC is connected in series with the bias resistors R9 and R10 and grounded, and the connection terminals of the bias resistors R9 and R10 are connected to the base of the triode Q2.

Embodiment 3

[0020] Embodiment 3, a voltage-controlled continuously adjustable attenuation circuit as described in Embodiment 2, the inverting fixed-value amplifier further includes a Zener diode DZ1, and the Zener diode DZ1 is connected in series between the base of the transistor Q2 and the between bias resistor R9. Under non-wide temperature requirements, this function can be accomplished by changing the ratio of the sampling resistor without using the Zener diode DZ1.

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PUM

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Abstract

The invention discloses a voltage-controlled continuous adjustable attenuation circuit comprising a monitoring power supply VCC, and also comprising a reverse fixed value amplifier and an attenuation circuit, wherein the monitoring power supply VCC is connected with the reverse fixed value amplifier, an output end of the reverse fixed value amplifier controls the attenuation circuit via a sampling resistor, and an input signal end Vi of the voltage-controlled continuous adjustable attenuation circuit is connected with an output signal end Vo via the attenuation circuit. An MOS tube Q1 is an attenuation adjusting device, linear change of resistance is achieved by changing circulation current between a source and a drain of the MOS tube, and thus voltage-controlled continuously adjustable attenuation is achieved. The voltage-controlled continuously adjustable attenuation circuit aims at solving the problem that as the output of a power amplification circuit changes, the circuit is turned off due to too low power supply voltage, and thus continuousness of communication is influenced, and the circuit is simple, the stability is high and the application range is wide.

Description

technical field [0001] The invention relates to a voltage-controlled continuously adjustable attenuation circuit, which is applied to reduce the change of the power supply voltage when the load becomes larger, in particular to a voltage-controlled continuously adjustable attenuation circuit used in a low-voltage meter terminal communication amplifying circuit circuit. Background technique [0002] When the low-voltage meter terminal uses a linear transformer, its overload will cause the output of the transformer to be too low. But the same transformer takes into account that it will not be overloaded 90% of the time - this specification is usually used, but because of the 10% probability of overloading, it may cause the entire system to not work properly. Such as figure 1 As shown, the general solution to this is the load series current limiting resistor, but in this way, the current limiting resistor will work in all cases, so that the output amplitude is also reduced und...

Claims

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Application Information

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IPC IPC(8): H03F1/30
Inventor 张一禾马华超黄碧海宋春雨
Owner JIANGSU LINYANG ENERGY CO LTD