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A discrete and continuous hybrid high-precision single-bit digital-to-analog conversion circuit

A digital-to-analog conversion circuit, high-precision technology, applied in the direction of digital-to-analog converter, analog/digital conversion, code conversion, etc., can solve the problems of time length sensitivity, in-band noise, etc., achieve temperature insensitivity, good linearity, Effect of clock duty cycle insensitivity

Active Publication Date: 2022-03-11
SUZHOU NOVOSENSE MICROELECTRONICS CO LTD
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  • Description
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Problems solved by technology

However, this structure is sensitive to clock jitter and the time length of x(t)=1 or 0. Clock jitter will introduce in-band noise. If the time length of a single x(t)=1 is different from the time of a single x(t)=0, will introduce an offset voltage

Method used

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  • A discrete and continuous hybrid high-precision single-bit digital-to-analog conversion circuit
  • A discrete and continuous hybrid high-precision single-bit digital-to-analog conversion circuit
  • A discrete and continuous hybrid high-precision single-bit digital-to-analog conversion circuit

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Embodiment Construction

[0024] The preferred implementation of the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings to help those skilled in the art understand the technical solution of the present invention. In this application, "group" is used to represent multiple electronic devices of the same type, such as a sampling capacitor group. multiple sampling capacitors.

[0025] image 3 Shown is a schematic diagram of the frame structure of the digital-to-analog conversion circuit, which shows the signal input and output process and the signal processing module, omitting its internal circuit details and the fine structure between different modules.

[0026] image 3 The digital-to-analog conversion circuit shown in the figure includes the first-stage integrator SCI and the second-stage integrator RCI. The input terminal SCIin of the first-stage integrator SCI is connected to the output terminal Dout of the digital signal inpu...

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Abstract

The invention discloses a discrete and continuous hybrid high-precision single-bit digital-to-analog conversion circuit, which includes a first-stage integrator and a second-stage integrator, and the output terminal of the first-stage integrator is connected to the second-stage integrator. The input end of the integrator is connected, the first-stage integrator is a discrete SC integrator, and the second-stage integrator is a continuous RC integrator; the input end of the first-stage integrator is connected to a digital signal input circuit , the output terminal of the second-stage integrator is an analog signal output terminal. The present invention combines the advantages of the time-discrete SC integrator and the time-continuous RC integrator, and solves the problem of the voltage swing of the SC integrator and the noise introduced by the clock jitter of the RC integrator. At the same time, the SC or RC integrator does not need to be used additional circuitry to compensate.

Description

technical field [0001] The invention belongs to the field of analog-digital hybrid circuits, in particular to a discrete and continuous hybrid high-precision single-bit digital-to-analog conversion circuit. Background technique [0002] An isolation amplifier is usually composed of two parts: a modulation circuit and a demodulation circuit. The modulation circuit converts the analog signal into a modulated signal and transmits it through the isolation band to the secondary side, and the demodulation circuit on the secondary side converts the modulated signal into an analog signal to realize an amplifier with isolation capability. The most common structure of the modulation circuit and demodulation circuit is a single-bit (sigma-delta) analog-to-digital converter (ADC) and a single-bit digital-to-analog converter (DAC), which has good linearity and low noise , Strong anti-interference ability. Among them, there are two types of single-bit digital-to-analog converters: discr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
CPCH03M1/661
Inventor 秦文辉盛云
Owner SUZHOU NOVOSENSE MICROELECTRONICS CO LTD
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