Variable gain mixed-frequency amplifier and biological signal acquisition and processing chip and system

Abstract

The invention relates to a variable gain mixed-frequency amplifier and a biological signal acquisition and processing chip and system. The chip comprises the variable gain mixed-frequency amplifier 11, a local oscillation signal generation circuit 12, an energy acquisition unit 13, a first capacitor C1 and a first resistor R1; a biological signal input end Vin of the variable gain mixed-frequency amplifier 11 receives biological signals, a power supply output end VDD of the variable gain mixed-frequency amplifier 11 is electrically connected to the energy acquisition unit 13, a local oscillation signal input end LO of the variable gain mixed-frequency amplifier 11 is electrically connected to the local oscillation signal generation circuit 12, a grounding end GND of the variable gain mixed-frequency amplifier 11 is used for obtaining external ground-supplying signals, and an output end Vout of the variable gain mixed-frequency amplifier 11 is electrically connected to a first end of the first capacitor C1 and a second end of the first capacitor C1 for outputting modulated audio signals; the local oscillation signal generation circuit 12 is used for receiving alternating current signals and supplying local oscillation signals to the variable gain mixed-frequency amplifier 11 after processing; the energy acquisition unit 13 is used for receiving the alternating current signals and supplying direct current power to the variable gain mixed-frequency amplifier 11 after processing.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and in particular relates to a variable gain mixing amplifier, a biological signal acquisition and processing chip and a system. Background technique [0002] As people's demand for health and medical care continues to increase, wearable and implantable medical devices based on Wireless Body Area Network (WBAN) have attracted extensive attention. These medical devices are easy to use, can realize real-time monitoring of human body signals, and send them to smart terminals for data processing, which is of great significance for disease prevention and monitoring. Common biological signals include electrocardiogram (ECG), electroencephalogram (EEG) and electromyography (EMG), etc. These signals are very weak, with typical values ​​in the order of microvolts and millivolts, and the frequency is low. The low noise performance of the system has strict requirements. Chopping modulati...

AI Technical Summary

Problems solved by technology

However, at present, the audio modulation system using chopping modulation technology needs to use traditional low-noise preamplifier and other chips. The redundant circuits in this chip cause the problems of large circuit structure area and high power consumption. Structure, the internal circuit of the chip cannot be changed, so it has a great impact on the expansion of circuit functions

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