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Low noise switch capacitor circuit having embedded amplifier

A low-noise switching and capacitive circuit technology, applied in differential amplifiers, DC-coupled DC amplifiers, electrical components, etc., to achieve the effect of reducing area and power consumption, and reducing chip area and power consumption

Active Publication Date: 2009-02-11
海芯科技(厦门)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the switched capacitor integrated circuit technology, there is no related report about placing the active amplifier directly in the switched capacitor circuit

Method used

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  • Low noise switch capacitor circuit having embedded amplifier
  • Low noise switch capacitor circuit having embedded amplifier
  • Low noise switch capacitor circuit having embedded amplifier

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Embodiment Construction

[0024] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0025] see image 3 , the present invention is provided with switched capacitor circuit and active amplifier A, and switched capacitor circuit is provided with the 1st switch 1, the 2nd switch 2, electric capacity C1 and operational amplifier OP1, the 1st switch 1 and the 2nd switch 2 can combine arbitrarily according to need . The input end of the active amplifier A is connected to the first switch 1 , the output end of the active amplifier A is connected to the capacitor C1 , and the capacitor C1 is connected to the negative input end of the operational amplifier OP1 through the second switch 2 . Wherein, the second switch 2 can also be omitted as required, so that the capacitor C1 is directly connected to the negative input terminal of the operational amplifier OP1. The output terminal of the operational amplifier OP1 can be connected with the ne...

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PUM

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Abstract

A low-noise switched-capacitor circuit with a built-in amplifier relates to a switched-capacitor circuit. The low-noise switched-capacitor circuit comprises a switched-capacitor circuit and an active amplifier, wherein the switched-capacitor circuit includes a switch, a capacitor and an amplifier; the input terminal of the active amplifier is connected with the switch; the output terminal of the active amplifier is connected with the capacitor; and the capacitor is connected with the negative input terminal of an operational amplifier. The low-noise switched-capacitor circuit can be used for a switched-capacitor amplifier, a switched-capacitor integrator and other switched-capacitor circuits of other types to meet the requirement for low noise of the system and simultaneously reduce the occupied chip areas and the power consumptions of the capacitor and the operational amplifier. The low-noise switched-capacitor circuit can maximally reduce the desired chip area and the power consumption for the switched-capacitor circuit during low-noise operation, so that the noise index of the switched-capacitor circuit is not restricted by sampling noise, i.e. KT / C noise, of the capacitor.

Description

technical field [0001] The invention relates to a switched capacitor circuit, in particular to a low-noise switched capacitor circuit with a built-in amplifier. It can be applied to various types of switched capacitor circuits including switched capacitor amplifiers, switched capacitor integrators and others. Background technique [0002] The traditional switched capacitor circuit adopts the combination of capacitor ratio and switch, and achieves the purpose of signal processing through the operation of the charge on the capacitor. Due to the sampling noise of the switched capacitor itself, that is, KT / C thermal noise, the capacitance value C required by the low-noise switched capacitor circuit is very large. This not only causes the chip area to increase proportionally with the increase in system noise requirements, but also increases the power consumption of the required operational amplifier and the occupied chip area in order to drive large capacitors. In addition, if ...

Claims

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Application Information

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IPC IPC(8): H03H19/00H03F3/45
Inventor 许肖锋
Owner 海芯科技(厦门)有限公司
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