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Voltage amplitude limiting circuit for controlling current supply switch of current steering analog-to-digital converter

A digital-to-analog converter and limiter circuit technology, applied in the direction of digital-to-analog converters, can solve problems such as limiting the output voltage range of digital-to-analog converters, and achieve the effect of reducing glitches and steep rising edges

Active Publication Date: 2012-07-11
NATIONZ TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a new type of current source switching voltage limiting circuit used in the current steering digital-analog converter, so as to increase the output voltage range of the digital-analog converter and overcome the existing lower limiter circuit and The upper limit circuit limits the output voltage range of the digital-to-analog converter

Method used

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  • Voltage amplitude limiting circuit for controlling current supply switch of current steering analog-to-digital converter
  • Voltage amplitude limiting circuit for controlling current supply switch of current steering analog-to-digital converter
  • Voltage amplitude limiting circuit for controlling current supply switch of current steering analog-to-digital converter

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Experimental program
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Effect test

Embodiment 1

[0035] Figure 5 It is the circuit principle diagram of Embodiment 1 of the limiting circuit of the present invention. The limiting circuit is composed of 1 NMOS transistor, 4 PMOS transistors and a standard inverter INV. Wherein, the PMOS transistor MP1 constitutes the resistance unit, the source of the PMOS transistor MP1 is electrically connected to the voltage source VDD of the limiter circuit, the gate of the PMOS transistor MP1 is grounded, and the drain of the PMOS transistor MP1 is connected to the limiter circuit The output terminal OUT is electrically connected. The PMOS transistor MP2 and the PMOS transistor MP3 constitute the third switch unit, wherein the source of the PMOS transistor MP2 is electrically connected to the voltage source VDD of the limiter circuit, the drain of the PMOS transistor MP2 is short-circuited to the source of the PMOS transistor MP3, The gate of the PMOS transistor MP2 is connected to the output terminal of the inverter INV; the drain a...

Embodiment 2

[0048] Embodiment 2 of the present invention adopts the equivalent circuit of Embodiment 1, its principle is basically the same as Embodiment 1, and its circuit structure is as follows Image 6 shown.

[0049] The same as the first embodiment, the first switch unit and the second switch unit in the second embodiment also respectively use the NMOS transistor MN5 and the PMOS transistor MP4, the gate of the PMOS transistor MP4 and the gate of the NMOS transistor MN5 Short-circuited and connected to the input terminal IN of the limiting circuit, the source of the PMOS transistor MP4 and the drain of the NMOS transistor MN5 are short-circuited and electrically connected to the output terminal OUT of the limiting circuit, and the drain of the PMOS transistor MP4 It is short-circuited with the source of the NMOS transistor MN5 and grounded; the input terminal of the inverter INV is electrically connected with the input terminal IN of the limiting circuit.

[0050] The difference fr...

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Abstract

The invention relates to a voltage amplitude limiting circuit for controlling a current supply switch of a current steering analog-to-digital converter (DAC). The voltage amplitude limiting circuit comprises a first switch unit and a second switch unit which are arranged between an output end and a grounding end of the amplitude limiting circuit in parallel, a standard inverter of which the input end is electrically connected with the input end of the amplitude limiting circuit, and a resistance unit and a third switch unit which are arranged between a voltage supply and the output end of the amplitude limiting circuit in parallel, wherein the first switch unit controls the on and off between the output end and the grounding end of the amplitude limiting circuit according to signal voltage of the input end of the amplitude limiting circuit; the second switch unit controls the on and off between the output end and the grounding end of the amplitude limiting circuit according to the signal voltage of the input end of the amplitude limiting circuit; and the third switch unit controls the on and off between the voltage supply and the output end of the amplitude limiting circuit according to the signal voltage of the output end of the standard inverter. By adopting the amplitude limiting circuit provided by the invention, burrs of the output signal of the DAC are reduced; the dynamic performance of the DAC is improved; and an output voltage range of the DAC is increased.

Description

technical field [0001] The invention belongs to the design field of analog integrated circuits, and in particular relates to a voltage limiting circuit used for controlling a current source switch in a current steering type digital-to-analog converter. Background technique [0002] Current steering digital-to-analog converter (Current Steering DAC) is widely used in the field of signal processing and communication because of its fast speed, high precision and strong driving ability. The working principle of the current steering DAC (digital-to-analog converter) is to turn on the corresponding current source switch according to the input digital signal, and after the current is summed, a resistor completes the transformation from current to voltage, thereby realizing the conversion from digital signal to analog signal. [0003] Due to the effect of clock feedthrough, fast transitions of digital signals will generate large glitches at the output of the DAC, which severely limi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
Inventor 庄奕琪汤华莲李鹏赵辉李勇强沈晔
Owner NATIONZ TECH INC
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