Cantor Colburn LLP
Circuit for generating differential reference voltages, circuit for detecting signal peak, and electronic device
A circuit for generating differential reference voltages, a circuit for detecting a signal peak, and an electronic device. In the circuit for generating reference voltages, a common-mode extraction circuit receives a first differential signal and a second differential signal, extracts a common-mode level from the first differential signal and the second differential signal, and applies the common-mode level to a non-inverting input terminal of a first operational amplifier. The first operational amplifier, a main control switch, a first voltage dividing resistor, a second voltage dividing resistor, and a first direct current power source constitute a feedback loop, to generate differential reference voltages matching with the common-mode level. Adjusting a current provided by the first direct current power source can change the differential reference voltages, obtaining a reference for to-be-detected amplitude of the signals. Signal amplitude is detected with high precision, and detection reliability of a peak detecting circuit is improved.
LONTIUM SEMICONDUCTOR CORPORATION
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Cheng Yu Haiyan Xiangyu Jiaxi
Tao Chen Wei Ji Fu