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Dual switched capacitor circuit applied to pipelined analogue-to-digital converter

A technology of switched capacitor circuit and capacitor circuit, applied in the direction of analog-to-digital converter, etc., can solve the problems of current consumption, signal-to-noise ratio loss, etc.

Active Publication Date: 2013-02-13
ESPRESSIF SYST SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional multi-bit pipelined analog-to-digital converters require an operational amplifier for sample-and-hold, which introduces additional signal-to-noise ratio loss and current consumption

Method used

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  • Dual switched capacitor circuit applied to pipelined analogue-to-digital converter
  • Dual switched capacitor circuit applied to pipelined analogue-to-digital converter
  • Dual switched capacitor circuit applied to pipelined analogue-to-digital converter

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Embodiment Construction

[0026] based on the following figure 1 with figure 2 , specify the preferred embodiment of the present invention:

[0027] Such as figure 1 Shown is a circuit diagram of a dual-set switched capacitor circuit suitable for a pipelined analog-to-digital converter. The dual-set switched capacitor circuit suitable for a pipelined analog-to-digital converter includes an operational amplifier 4, a sub-digital-analog converter 1, and two sets of Switched capacitor circuits 301 and 302 , two sets of dynamic element matching circuits 101 and 102 , and two sets of registers 201 and 202 .

[0028] An input terminal of the sub-DAC 1 inputs an analog input signal Vin and a total clock signal ph, and an output terminal outputs a digital output signal Dout.

[0029] The input end of the first dynamic element matching circuit 101 is connected to the output end of the sub-DAC 1 .

[0030] The input end of the second dynamic element matching circuit 102 is connected to the output end of the...

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Abstract

The invention discloses a dual switched capacitor circuit applied to a pipelined analogue-to-digital converter. The dual switched capacitor circuit comprises an operational amplifier, a sub digital-to-analogue converter, two groups of switched capacitor circuits, two groups of dynamic element matching circuits and two groups of registers. The two groups of switched capacitor circuits are used for alternate sampling and operation, so that the use of a sampling and holding operational amplifier can be avoided, performance can be improved, and current consumption also can be reduced.

Description

technical field [0001] The invention relates to a double-group switching capacitor circuit suitable for a pipelined analog-to-digital converter. Background technique [0002] Traditional multi-bit pipelined analog-to-digital converters require an operational amplifier to implement sample-and-hold, which introduces additional SNR loss and current consumption. Contents of the invention [0003] The invention provides a dual-group switched capacitor circuit suitable for a pipelined analog-to-digital converter, which avoids the use of a sample-and-hold operational amplifier, improves performance and reduces current consumption. [0004] In order to achieve the above object, the present invention provides a dual-group switched capacitor circuit suitable for a pipelined analog-to-digital converter, the dual-group switched capacitor circuit includes an operational amplifier, a sub-digital-to-analog converter, a first switched capacitor circuit and a second switch a capacitor cir...

Claims

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Application Information

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IPC IPC(8): H03M1/12
Inventor 张瑞安王强
Owner ESPRESSIF SYST SHANGHAI