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Input signal amplitude detection circuit with adjustable output signal range and method thereof

A technology of amplitude detection and output signal, which is applied in the field of input signal amplitude detection circuit, can solve the problems that the output signal range of the signal amplitude detection circuit cannot be adjusted, and cannot meet the signal amplitude detection indication of the ADC circuit, etc., so as to improve the detection range of the input signal and improve the The effect of linearity

Pending Publication Date: 2021-12-14
FENGHUO COMM SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the output signal range of the signal amplitude detection circuit in the prior art is not adjustable, and cannot meet the requirements of ADC circuits with different sampling ranges to realize the signal amplitude detection indication

Method used

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  • Input signal amplitude detection circuit with adjustable output signal range and method thereof
  • Input signal amplitude detection circuit with adjustable output signal range and method thereof
  • Input signal amplitude detection circuit with adjustable output signal range and method thereof

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Embodiment 1

[0058] Embodiment 1 of the present invention provides an input signal amplitude detection circuit with adjustable output signal range, wherein the traditional error amplifier can refer to image 3 . And the embodiment of the present invention realizes as Figure 5 As shown, including the differential signal amplitude detection circuit and error amplifier, specifically:

[0059] The error amplifier circuit consists of resistors R 0 , R 01 ~R 0n and MOS switch sw 01 ~ sw 0n The first switched resistor array consisting of resistors R f , R f1 ~R fn and MOS switch sw f1 ~ sw fn A second switch resistor array formed, and an operational amplifier;

[0060] Wherein, the first switched resistor array is connected in series with the input negative pole or the input positive pole of the operational amplifier, or a set of the first switched resistor array is connected in series with the input positive pole and the input negative pole of the operational amplifier respectively; ...

Embodiment 2

[0087] The embodiment of the present invention takes Figure 7 The differential signal amplitude detection circuit used in the present invention shown in figure 2 A source follower is added on the basis of , the function of this follower is to eliminate the V in formula ① th Influenced by the MOS tube V th Designed to be the same as the differential pair. The next step is to elaborate on its elimination of V th The principle and mechanism of the influence.

[0088] After the differential input signal passes through the signal amplitude detection circuit, two signals are output: the common mode output voltage V cm0 and differential mode output voltage V dm . in,

[0089]

[0090] V dm That is formula ①, from formula ①, V dm The result is simultaneously with the common mode component and differential mode components related, if the input signal amplitude is single-ended as V amp , ideally:

[0091] V in =V cm0 -V amp

[0092] V ip =V cm0 +V amp

[0093...

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Abstract

The invention relates to the technical field of analog integrated circuits, and provides an input signal amplitude detection circuit with an adjustable output signal range and a method thereof. An error amplifier circuit is composed of a first switch resistor array, a second switch resistor array and an operational amplifier. If the input positive electrode and / or the input negative electrode of an corresponding error amplifier are / is connected with the first switch resistor array in series, the corresponding first switch resistor array is located between the output port of a differential signal amplitude detection circuit and the input port of the error amplifier. According to the invention, through the resistor array with switch control, the output signal range of the signal amplitude detection circuit can be adjusted, so ADC circuits with different sampling ranges can be connected later to realize signal amplitude detection indication.

Description

【Technical field】 [0001] The invention relates to the technical field of analog integrated circuits, in particular to an input signal amplitude detection circuit with an adjustable output signal range and a method thereof. 【Background technique】 [0002] In the optical communication system, in order to ensure the reliability of optical signal transmission and reception, it is necessary to monitor the received optical power of the optical module. Monitoring the received optical power can make the received optical signal strength meet the receiving requirements and avoid excessive or excessive optical power. Small enough to cause bit errors, and even affect the life of the receiving optical module, making the input signal amplitude detection circuit a common circuit in optical communication transceiver chips. [0003] The traditional signal amplitude detection circuit usually uses a peak detection circuit to detect the differential mode voltage at the input terminal and output...

Claims

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Application Information

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IPC IPC(8): G01R31/28G01R19/25H04B10/40
CPCG01R31/2843G01R19/2503H04B10/40
Inventor 程妮
Owner FENGHUO COMM SCI & TECH CO LTD
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