Terahertz wave readout circuit

By designing a terahertz wave reading circuit including a detector model, an integral amplification module, an integral signal sampling module and an analog-to-digital conversion module, the problem of difficulty in detecting weak terahertz wave signals is solved, high sensitivity and low noise signal detection is achieved, and TOF three-dimensional imaging technology is supported.

CN113985442BActive Publication Date: 2025-03-25INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202111258853.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-10-27
Publication Date
2025-03-25
Estimated Expiration
2041-10-27

AI Technical Summary

Technical Problem

The prior art is difficult to effectively detect and capture weak terahertz wave signals, are easily disturbed by noise, and the signal change frequency is high and difficult to deal with.

Method used

A terahertz wave readout circuit is designed, including a detector model, an integral amplification module, an integral signal sampling module and an analog-to-digital conversion module. Through the integral amplification and sampling conversion technology, the simulated terahertz photocurrent signal is converted into a digital signal to achieve accurate detection of weak terahertz waves.

Benefits of technology

It realizes high sensitivity and low noise detection of weak terahertz wave signals, improves the signal-to-noise ratio, and can effectively support the application of TOF three-dimensional imaging technology.

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Abstract

The present invention provides a terahertz wave readout circuit, comprising: a detector model (A), which is used to simulate an input terahertz modulated photocurrent signal to obtain a first analog signal, and demodulate and sample the first analog signal to obtain a sampling signal; an integral amplification module (B), which is used to integrate and amplify the sampling signal to obtain an amplified signal; an integral signal sampling module (C), which is used to collect the terahertz signal value of the amplified signal within an integration period to obtain a sampling integral signal; an analog-to-digital conversion module (D), which is used to convert the sampling integral signal into a digital signal; wherein the sampling signal has a phase offset with the simulated terahertz photocurrent signal. The readout circuit disclosed in the present invention can effectively detect and amplify weak terahertz wave signals, and realizes accurate detection of weak terahertz waves in TOF imaging.
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