A Switched Capacitor Bias Circuit for Reduced Power Consumption in Operational Amplifiers

Abstract

The invention discloses a switched capacitor biasing circuit capable of reducing the power consumption of an operational amplifier. The switched capacitor biasing circuit comprises a P type current source tube biasing unit SCP and an N type current source tube biasing unit SCN. The biasing circuit utilizes the capacitor divider to transmit input signals quickly; the interference caused by the clock feedthrough effect is small; different biasing voltages can be generated without complex front-end bias generation circuit, thus the chip area is saved; and no direct current path is needed, so that no additional power consumption is increased. The switched capacitor biasing circuit can be widely applied to any operational amplification circuit working under certain switching frequency, and help the operational amplifier to achieve relatively low power consumption and quick signal establishment.

Description

technical field [0001] The invention belongs to the technical field of microelectronics and relates to a bias circuit of a high-performance operational amplifier, in particular to a switched capacitor bias circuit capable of effectively reducing the power consumption of the operational amplifier. Background technique [0002] As an intermediate bridge circuit between the analog world and the digital world, the analog-to-digital converter is widely used in wireless communication base stations, medical equipment, military radar and precision guidance systems, etc. With the increasing popularity of portable devices, it is required that the analog-to-digital converter has high speed and high precision, and can obtain lower power consumption at the same time. However, high-performance analog-to-digital converters often come at the expense of higher power consumption in order to obtain higher speed and accuracy. As the core unit and main source of power consumption in the analog-...

AI Technical Summary

Problems solved by technology

[0008] The technical problem of the present invention: overcomes the existing problems of the existing bias switch, and provides a switched capacitor bias circuit that can reduce the power consumption of the operational amplifier. The bias circuit utilizes capacitor voltage division to quickly transmit the input signal; The feed-through effect has little interference; different bias voltages can be generated without complex front-end bias generation circuits, saving chip area; no DC current path, no additional power consumption

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