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A Wide Input Swing Flash ADC Circuit Based on Time Domain Comparator

A time domain comparator and wide input technology, applied in the field of electronic information, can solve the problems of low precision, low power consumption and low cost, and achieve the effect of reducing power consumption, low power consumption design, and high conversion speed

Active Publication Date: 2017-02-22
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing ADC circuit "difficult to meet high speed, medium and low precision, low power consumption and low cost at the same time", the present invention proposes a new Flash ADC circuit, which is realized based on 1.8V power supply voltage 0.18-μm CMOS process A 5-bit FlashADC circuit with an input swing of 0.4V-1.4V and a conversion rate of 500MHz

Method used

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  • A Wide Input Swing Flash ADC Circuit Based on Time Domain Comparator
  • A Wide Input Swing Flash ADC Circuit Based on Time Domain Comparator
  • A Wide Input Swing Flash ADC Circuit Based on Time Domain Comparator

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Embodiment Construction

[0023] Novel Flash ADC circuit of the present invention such as figure 1 As shown, it includes: a basic sample and hold circuit, a reference level generation circuit composed of 30 resistor ladders, 16 N-type time-domain comparators, 15 P-type time-domain comparators, and an encoding circuit Encoder. The input signal is sampled and held by S / H, and the sampled input signal V in respectively and 31 reference levels V ref0 -V ref31 Constitute 31 sets of input signals, for the convenience of description, the following is V in and V ref0 As an example, explain the working principle of the N-type time-domain comparator.

[0024] N-type unity gain level adjustment circuit DS_N to Vin and V ref0 The voltage value is adjusted, and DS_N is guaranteed not to change V in and V ref0 Under the condition of relative size relationship, the voltage value is properly shifted, so that the shifted level V i and V r0 The voltage value satisfies the input range of the N-type delay unit DN...

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Abstract

The invention relates to a Flash ADC (Analog to Digital Converter) circuit and particularly relates to a wide-input-amplitude Flash ADC circuit based on time domain comparators. Specifically, a voltage comparator circuit in a traditional Flash ADC is substituted by a novel time domain comparator circuit so that the power consumption of the whole Flash ADC circuit is reduced. N-type and P-type time domain comparators are adopted at the same time and a unit gain level adjustment circuit is added to traditional time domain comparators so that the technologies ensure a larger input amplitude. The wide-input-amplitude Flash ADC circuit based on the time domain comparators has an input amplitude of 0.4V-1.4V, a conversion speed of 500Mhz, a 5-bit quantization precision, a power consumption of 2.9mW and a lower area cost. The wide-input-amplitude Flash ADC circuit solves a problem that the prior ADCs are unable to satisfy wide input amplitude, high speed, low power consumption, low cost and lower precision at the same time. Moreover, the Flash ADC can also be used as a sub-module of an ADC of other types such as an assembly-line-type ADC or a multi-step ADC and the like so that the Flash ADC is high in practical value.

Description

technical field [0001] The invention relates to a Flash ADC (flash analog-to-digital converter) circuit, in particular to a wide-swing Flash ADC circuit based on a time-domain comparator, belonging to the technical field of electronic information. Specifically, the voltage comparator circuit in the traditional Flash ADC is replaced by a new time-domain comparator circuit to reduce the power consumption of the entire Flash ADC circuit; at the same time, N-type and P-type time-domain comparators are used, and are traditional The time-domain comparator is added with unity gain level adjustment circuit, these techniques guarantee larger input swing. Background technique [0002] The digital electronic system with modern computer as the core has high-speed, high-efficiency, and massive information processing capabilities, and it gradually replaces the early analog electronic system to become the core of the contemporary information field. The external analog signal can only be r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/36
Inventor 宫礼星盖伟新
Owner PEKING UNIV