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Signal common-mode level and amplitude adjustment method and circuit

A common mode level, amplitude adjustment technology, applied in the direction of pulse amplitude modulation and so on

Inactive Publication Date: 2015-04-08
AVIC NO 631 RES INST
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Problems solved by technology

[0003] In order to prevent erroneous judgment caused by signal common-mode level shift and reduce the bit error rate of the receiver, the invention provides a method and circuit for adjusting the common-mode level and amplitude of the input signal, which can solve the common-mode level of the analog signal. And the problem of signal amplitude adjustment

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  • Signal common-mode level and amplitude adjustment method and circuit
  • Signal common-mode level and amplitude adjustment method and circuit
  • Signal common-mode level and amplitude adjustment method and circuit

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Embodiment Construction

[0024] The technical solutions of the present invention are clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are all Belong to the protection scope of the present invention.

[0025] Such as figure 1 As shown, a signal common-mode level and amplitude adjustment circuit includes an active integrator circuit and a signal amplitude adjustment circuit; the signal amplitude adjustment circuit is used to adjust the AC signal to be adjusted according to the preset resistance ratio After the amplitude adjustment, the output signal Vout is obtained as the input signal of the active integrator circuit; the active integrator circuit is used to integrate the output signal Vout ...

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Abstract

The invention provides a signal common-mode level and amplitude adjustment method and circuit. The signal common-mode level and amplitude adjustment circuit comprises an active integrator circuit and a signal amplitude adjustment circuit, wherein the signal amplitude adjustment circuit is used for carrying out amplitude adjustment on alternating-current signals needing to be adjusted according to preset resistance proportion and then obtaining an output signal Vout used as an input signal of the active integrator circuit; the active integrator circuit is used for carrying out integral processing on the output signal Vout according to a reference voltage Vref, and obtaining a common-mode voltage which is used as an input signal of the signal amplitude adjustment circuit again. The signal common-mode level and amplitude adjustment method and circuit provided by the invention have the advantages that the purposes of preventing wrong judgment caused by offset of the signal common-mode level and reducing the error rate of a receiver are achieved, and the problem of the simulated-signal common-mode level and amplitude adjustment can be solved.

Description

technical field [0001] The invention provides a method and a circuit for adjusting the common-mode level and signal amplitude of input signals. The invention can be used in applications such as analog signal processing and bus receivers. Background technique [0002] When the signal is transmitted through the transmission line, due to the low-pass characteristics of the transmission medium and the influence of non-ideal factors such as inter-symbol interference (ISI), the common-mode level of the signal received by the receiver will shift. When the common-mode level of the signal shifts, it will cause the decision circuit to make a wrong decision, thus resulting in a reception error. In order to prevent erroneous judgments caused by signal common-mode level shift and reduce the bit error rate of the receiver, the receiver must adjust the common-mode level and signal amplitude of the input signal. Contents of the invention [0003] In order to prevent erroneous judgment c...

Claims

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Application Information

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IPC IPC(8): H03K7/02
Inventor 王晋邵刚唐龙飞刘颖龙强蔡叶芳
Owner AVIC NO 631 RES INST
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