A logarithmic detector
By introducing a DC feedback compensation unit and a temperature compensation module into the logarithmic detector, the problems of low output signal accuracy and trailing phenomenon are solved, the signal response speed and temperature stability are improved, and higher signal accuracy and consistency are achieved.
CN122178848APending Publication Date: 2026-06-09INST OF MICROELECTRONICS CHINESE ACAD OF SCI LTD
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Patent Information
- Application Number
- CN202610176469.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-06
- Publication Date
- 2026-06-09
AI Technical Summary
Technical Problem
Existing logarithmic detectors have low output signal accuracy and suffer from DC offset and tailing phenomena, which affect signal response speed and temperature stability.
Method used
The DC feedback compensation unit in the feedback loop module is used to perform negative feedback on the differential input signal to reduce the DC offset caused by the gain effect of the limiting amplifier, and the voltage signal is temperature compensated by the temperature compensation module to improve the accuracy of the output signal.
Benefits of technology
It significantly improves the output signal accuracy of the logarithmic detector, solves the problems of DC offset and tailing, and improves the signal response speed and temperature stability.
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Figure CN122178848A_ABST
Abstract
The application relates to the technical field of signal processing, and discloses a logarithmic detector, which comprises at least one feedback loop module, multiple rectification modules, a filtering module, a buffer module, a temperature compensation module and a band gap reference module; the feedback loop module is used for amplifying an input differential input signal to obtain an amplified differential signal; the rectification module is used for converting the differential input signal and the amplified differential signal to output a current signal; the buffer module is used for performing level shifting on a filtered voltage signal to output a detection voltage; the temperature compensation module is used for performing temperature compensation on the detection voltage to output an output signal; one feedback loop module comprises one pre-stage limiting amplification unit, two limiting amplification units and a direct current feedback compensation unit. The direct current feedback compensation unit performs negative feedback on the differential input signal, reduces direct current distortion, and improves the precision of the output signal; the temperature compensation module performs temperature compensation on the voltage signal, and improves the precision of the output signal.
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