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Voltage amplitude limiter for current supply switch in high-speed A/D converter

A digital-to-analog converter, voltage limiting technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve the problem of not being able to give a control signal curve, not ideal for burr elimination, etc. , to improve overall performance, improve SNR, and reduce glitches

Active Publication Date: 2006-09-06
HANGZHOU VANGO TECH
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Problems solved by technology

[0010] The technical problem to be solved in the present invention is that in the prior art, in the high-speed digital converter, because the switch parasitic capacitance produces burrs on the output curve of the converter, several circuit structures for eliminating the burrs cannot ideally eliminate the burrs. Or cannot give a control signal curve with a steep edge

Method used

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  • Voltage amplitude limiter for current supply switch in high-speed A/D converter
  • Voltage amplitude limiter for current supply switch in high-speed A/D converter
  • Voltage amplitude limiter for current supply switch in high-speed A/D converter

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Embodiment Construction

[0020] Figure 1-3 Indicates a prior art circuit.

[0021] refer to Figure 4 , represents the limiter circuit described in the technical solution of the present invention, which is used for the voltage limiter of the current source switch in the high-speed digital-to-analog converter. Inverter structure, another NMOS tube inserted in this type of inverter and a standard inverter. attached by Figure 5 with attached Image 6 The different curves shown show that when the input of the DAC is a sinusoidal digital signal, the output signal waveform with glitches before limiting is shown in the attached Figure 5 shown, while attached Image 6 It is the output waveform after clipping, and the glitch has been eliminated.

[0022] refer to Figure 7 , a specific structural diagram of applying the solution of the present invention to a current source switching circuit in a high-speed digital-to-analog converter.

[0023] In the figure, the input terminal IN of the voltage limi...

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Abstract

Current supply switch voltage clipper used in high-speed digital analog converter, belonging to electric installation field, is composed of eke-inverter consisting of connected PMOS tube and one NMOS tube, and another NMOS inserted in this eke-inverter and one standard inverter. The present invention can effectively reduce output signal burr and improve output signal SNR, raising high-speed digital analog converter total performance.

Description

technical field [0001] The invention belongs to the field of electrical devices, in particular to a voltage limiter device applied to a current source switch in a high-speed digital-to-analog converter (DAC), and belongs to the category of CMOS integrated circuits. Background technique [0002] A current-switching DAC is a type of digital-to-analog converter. High-speed digital-to-analog converters mostly use this structure. The principle of this digital-to-analog converter is to turn on the switches of the corresponding number of unit current sources according to the size of the input digital value, and aggregate these currents to a resistor to complete the current-voltage conversion, thereby completing the digital-to-analog conversion. convert. First, the input binary code passes through the decoder, and the decoder decodes the binary code into thermometer code and original code in a certain decoding method. These codes are used to control the switching of the correspon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/525
Inventor 钟书鹏谭年熊廖青
Owner HANGZHOU VANGO TECH
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