Comparator threshold voltage self-calibration circuit in superregenerative receiver

Abstract

The invention relates to a comparator threshold voltage self-calibration circuit in a superregenerative receiver. The comparator threshold voltage self-calibration circuit comprises a comparator and a self-calibration loop, the self-calibration loop comprises a low-pass filter, a pulse width detection unit, a pulse width judgment unit, a digital processing unit and a DAC (Digital-to-Analog Converter); comparing the oscillation envelope input signal A with a threshold voltage signal B by using a comparator to generate a pulse signal C; the pulse signal C is input into a low-pass filter to generate a pulse output signal D; the pulse width detection unit performs enabling counting on the signal D and outputs a numerical signal E in direct proportion to the pulse width of the signal D; the numerical value signal E is input into a pulse width judgment unit, the magnitude of the numerical value E is judged and classified, and an enable signal F is generated; the signal F is input to the data processing unit; the data processing unit identifies the signal F and generates a numerical signal G; the numerical value G is input into the digital-to-analog converter to generate a new threshold voltage signal B; according to the invention, the self-calibration of the threshold voltage of the comparator in the super-regenerator is realized, so that the sensitivity of the receiver is improved.

Description

technical field [0001] The invention relates to the technical field of wireless circuits, in particular to a comparator threshold voltage self-calibration circuit in a super regenerative receiver. Background technique [0002] How to effectively set the threshold voltage of the comparator in the super-regenerative receiver is one of the keys to improve the sensitivity of the super-regenerative receiver. The current public technology fixes the threshold voltage of the comparator in the super-regenerative receiver to an optimal value. The structure of the conventional super-regenerative receiver using the threshold voltage self-calibration circuit is as follows: image 3 As shown, its workflow is as follows Figure 4 shown. Through research, it is found that the optimal value will change with external factors such as temperature and process, thus affecting the sensitivity of the receiver. Contents of the invention [0003] In view of this, the purpose of the present invent...

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Problems solved by technology

Through research, it is found that the optimal value will change with external factors such as temperature and process, thus affecting the sensitivity of the receiver

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