Voltage detector and communication circuit

A technology of voltage detectors and circuits, applied in the direction of measuring current/voltage, instruments, measuring devices, etc.

A technology of voltage detectors and circuits, applied in the direction of measuring current/voltage, instruments, measuring devices, etc.

CN109976436BActive Publication Date: 2021-03-23REALTEK SEMICON CORP
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  • Voltage detector and communication circuit
  • Voltage detector and communication circuit
  • Voltage detector and communication circuit

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Embodiment Construction

[0070] The invention includes a voltage detector and a communication circuit. Compared with the prior art, the invention can detect a lower input voltage, so as to adjust circuit parameters in real time, so as to avoid excessive input voltage from damaging subsequent circuits. figure 2 Show the beneficial effect of the present invention, figure 2 in, V IN is the voltage of the input signal, V OUT is the output signal voltage, V THis the threshold voltage, when V IN greater than the voltage V 2 when V OUT will be greater than V TH , which points out that V IN may be too high, at this time the circuit parameters can be adjusted accordingly to reduce V IN . compared to the prior art figure 1 , figure 2 The voltage V 2 less than the voltage V 1 , which means that the present invention can detect lower input voltages.

[0071] image 3 An embodiment of the voltage detector of the present invention is shown. Such as image 3 As shown, the voltage detector 300 incl...

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Abstract

The invention discloses a voltage detector and a communication circuit. Compared with the prior art, the voltage detector can detect a lower input voltage. The result of the detection of the voltage detector of the invention can be used as a basis for adjusting circuit parameters, so that a condition that an excessively high input voltage damages a later-stage circuit can be avoided. According toan embodiment of the invention, the voltage detector includes an alternating current coupling circuit, a feedback amplifying circuit and an auxiliary circuit; the alternating current coupling circuitis used for generating a first input voltage and a second input voltage according to an input voltage; the feedback amplifying circuit is used for outputting shunt current according to source and sinkcurrent and determining an output voltage according to the first input voltage and the quantity of the shunt current; and the auxiliary circuit for determining the quantity of the source and sink current according to the second input voltage, wherein the source and sink current contains the shunt current. The output voltage increases with the rise of the first input voltage, and additionally increases as the shunt current increases, and therefore, the slope of the change of the ratio of the output voltage to the input voltage is larger, and testing can be benefitted.

Description

technical field [0001] The present invention relates to a voltage detector and a communication circuit, in particular to a voltage detector and a communication circuit capable of detecting low input voltage. Background technique [0002] Generally, a wireless communication circuit will amplify a received signal according to a gain (such as the gain of a low noise amplifier (LNA)) to generate an input signal for subsequent circuit processing. However, if the input signal is too large, the input signal may Damage to the subsequent circuit, therefore, in order to avoid the above problems, the wireless communication circuit usually includes a voltage detector to detect whether the voltage of the input signal exceeds a threshold voltage, if the detection result is yes, the wireless communication circuit will reduce the gain . [0003] figure 1 Displays the voltage of the input signal above V IN , output signal voltage V OUT , and the threshold voltage V TH Relationship. Suc...

Claims

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Application Information

Patent Timeline
23 Mar 2021
Publication
CN109976436B
IPC
G05F3/26; G01R19/165
CPC
G01R19/165; G05F3/26
Inventors
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