Reference voltage circuit
By combining dynamic element matching switching network and chopper signal, the connection of mismatched devices in the bandgap reference module is periodically switched, which is converted into high-frequency noise and filtered out, thus solving the problem of insufficient accuracy of bandgap reference source and realizing high-precision and temperature-stable reference voltage output.
CN121657809BActive Publication Date: 2026-06-16SILEAD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SILEAD
- Filing Date
- 2026-01-30
- Publication Date
- 2026-06-16
Smart Images
Figure CN121657809B_ABST
Abstract
The present disclosure provides a kind of reference voltage circuit, it is related to the field of semiconductor technology.Therein, reference voltage circuit includes: band gap reference module and feedback module, feedback module is configured to feedback voltage balance signal to band gap reference module, to make band gap reference module based on voltage balance signal and export initial reference voltage;Dynamic element matching switch network is configured to periodically switch the connection relationship of mismatch device in band gap reference module based on the dynamic switching signal accessed;Feedback module is further configured to access chopper signal, and the misadjustment of feedback module is modulated to high frequency band;Low-pass filter module is configured to access initial reference voltage, and low-pass filter is carried out to initial reference voltage.Through the technical scheme of the present disclosure, the output accuracy and temperature stability of reference voltage can be improved, which is conducive to meeting the application requirements of high-precision circuit.
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