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Second-order feedforward Sigma-Delta modulator based on successive comparison quantizer

A successive comparison, modulator technology, applied in instruments, signal transmission systems, electrical components, etc., can solve problems such as the loss of additional circuit power consumption

Inactive Publication Date: 2012-07-04
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The increase of additional circuits inevitably brings about the loss of power consumption

Method used

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  • Second-order feedforward Sigma-Delta modulator based on successive comparison quantizer
  • Second-order feedforward Sigma-Delta modulator based on successive comparison quantizer
  • Second-order feedforward Sigma-Delta modulator based on successive comparison quantizer

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Embodiment Construction

[0052] The embodiment of the present invention proposes a feed-forward second-order low-pass Sigma-Delta modulator based on a 4-bit asynchronous successive comparison quantizer using a multi-input sampling switched capacitor array adder, Figure 5 It is a modulator realized by the differential structure described by the schematic diagram of the single-ended circuit structure. The circuit includes two integrated circuits based on the switched capacitor structure of the prior art, wherein the operational amplifier in the first-order integrator adopts the chopper-stabilized operational amplifier 50 structure to realize; the second adder unit 6, one based on the prior art 4-bit asynchronous successive comparison quantizer 51, a 4-bit binary code is converted into 15-bit temperature code digital logic module 52 based on the prior art, a 4-bit feedback digital-to-analog converter 53 based on the unit capacitance structure of the prior art . its timing as Figure 6 shown. The feed...

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Abstract

The invention discloses a second-order feedforward Sigma-Delta modulator based on a successive comparison quantizer. The Sigma-Delta modulator comprises two integrators (1) based on a switched capacitor structure in the prior art, one multi-bit successive comparison quantizer (2), one digital circuit (3) transforming into a temperature code from a binary code based on the data weighed average algorithm, one feedback digital to analog converter (4) based on a capacitor, a first adder unit (5) for computing difference between an input signal and an output signal of the feedback digital to analog converter, and a second adder unit (6) which is directly formed by a multi-input sampling switched capacitor array of the successive comparator on a feedforward path, wherein the adder unit replaces the existing extra analog adder functional circuit or a digital adder functional circuit. The obtained Sigma-Delta modulator of the invention has the advantages of ultra-low power consumption and high resolution ratio.

Description

technical field [0001] The invention relates to a Sigma-Delta analog-to-digital converter, which belongs to the field of integrated circuits. Background technique [0002] With the widespread demand for consumer handheld electronic devices and the professional application of medical human body sensing detection systems, the demand for high-precision, low-power, and low-cost analog-to-digital converters has become increasingly widespread. However, with the continuous update of the integrated circuit technology and the decrease of the power supply voltage and the decrease of the intrinsic gain of the transistor, the difficulty of analog circuit design is increased. Therefore, we need to adopt innovative low-power design ideas at low voltage to meet the requirements of the system. For the design of low power consumption, high precision, low-cost analog-to-digital converters, it has become a trend to adopt feed-forward Sigma-Delta structured analog-to-digital converters. The k...

Claims

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Application Information

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IPC IPC(8): H03M1/38
Inventor 郎伟林平分万培元
Owner BEIJING UNIV OF TECH
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