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Circuit capable of adjusting parasitic direct-current bias of channel amplifier and adjusting method

A technology for DC biasing and regulating circuits, applied in the direction of improving amplifiers to reduce temperature/supply voltage variations, improving amplifiers to reduce noise effects, and improving amplifier input/output impedance, etc., can solve the deterioration of channel SNR indicators, signal measurement Reduce the range and other problems, to achieve the effect of ensuring the input impedance index, reducing the impact, and reducing the signal measurement range

Active Publication Date: 2020-12-04
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the signal measurement range becomes smaller and the signal-to-noise ratio index of the channel deteriorates in the prior art, the first object of the present invention is to provide a circuit that can adjust the parasitic DC bias of the channel amplifier

Method used

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  • Circuit capable of adjusting parasitic direct-current bias of channel amplifier and adjusting method
  • Circuit capable of adjusting parasitic direct-current bias of channel amplifier and adjusting method

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Embodiment 1

[0029] combine figure 2 , a circuit that can adjust the parasitic DC bias of the channel amplifier, including the amplifier and the parasitic DC bias automatic adjustment control device, the power supply terminal on the amplifier is connected with a power supply voltage adjustment circuit, and the two input terminals of the amplifier are signal input terminal and The DC offset adjustment terminal, the signal input terminal is connected with the input signal, the DC offset adjustment terminal is connected with a DC voltage adjustment circuit, and the signal input terminal is also connected with a matching resistor, an input impedance monitoring device and a DC bias monitoring device.

[0030] The two output terminals of the amplifier are differential signal output terminals, and an output differential DC bias monitoring device is connected to the two differential signal output terminals.

[0031] The power supply voltage regulating circuit, the direct current voltage regulatin...

Embodiment 2

[0040] A method for adjusting a circuit with an adjustable channel amplifier parasitic DC bias, using a circuit with an adjustable channel amplifier parasitic DC bias described in Embodiment 1, comprising the following steps:

[0041] Step 1: The parasitic DC bias automatic adjustment control device adjusts the DC voltage at the DC offset adjustment end through the DC voltage adjustment circuit, so that the bias voltages at the two differential signal output ends of the amplifier are equal;

[0042] The bias voltage of the two differential signal output terminals is monitored in real time by the output differential DC bias monitoring device, and sent to the parasitic DC bias automatic adjustment control device for judgment;

[0043] Step 2: The parasitic DC bias automatic adjustment control device adjusts the power supply voltage adjustment circuit so that the DC bias voltage at the signal input terminal is close to 0 volts. When the power supply voltage adjustment circuit is a...

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PUM

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Abstract

The invention provides a circuit capable of adjusting parasitic direct-current bias of a channel amplifier and an adjusting method. A power supply end on the amplifier is connected with a power supplyvoltage adjusting circuit, two input ends of the amplifier are respectively a signal input end and a direct-current offset adjusting end, and the direct-current offset adjusting end is connected witha direct-current voltage adjusting circuit. And the signal input end is also connected with a matching resistor, an input impedance monitoring device and a direct-current bias monitoring device. Theamplifier is provided with differential signal output ends, and the two differential signal output ends are connected with an output differential direct-current bias monitoring device. The power supply voltage adjusting circuit, the direct-current voltage adjusting circuit, the input impedance monitoring device, the direct-current bias monitoring device and the output differential direct-current bias monitoring device are electrically connected with a parasitic direct-current bias automatic adjusting control device. Parasitic direct-current bias of the channel amplifier can be adjusted to be close to zero volt, the influence of parasitic direct-current bias of a signal channel on direct-current characteristics of a test signal is reduced, and meanwhile, an input impedance index can be ensured.

Description

technical field [0001] The invention relates to the field of adjusting the parasitic DC bias of an amplifier in an oscilloscope, in particular to a circuit and an adjusting method for adjusting the parasitic DC bias of a channel amplifier. Background technique [0002] The oscilloscope analog signal conditioning circuit has functions such as signal amplification, attenuation, and DC offset adjustment. In order to improve the oscilloscope’s DC offset adjustment range index and reduce channel noise, the DC offset adjustment function is usually placed in the first-stage amplifier circuit. Due to the inconsistency of the manufacturing process and the inherent DC offset error in the design, a parasitic DC offset will be generated inside the amplifier circuit, and this parasitic DC offset will be fed back to the signal input port. If the parasitic DC offset is not processed , will cause the signal processing circuit composed of the amplifier to be in the open circuit state (the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F1/56H03F1/30
CPCH03F1/26H03F1/56H03F1/30
Inventor 杨江涛吕增强邵成华吴恒奎
Owner CHINA ELECTRONIS TECH INSTR CO LTD