Wide-input-range linear voltage-to-time conversion method and wide-input-range linear VTC

A linear voltage, wide input technology, applied in the field of linear voltage-time converters with wide input range, can solve the problems that the linearity is difficult to be further improved, and the transmission characteristics of voltage-time converters are limited by devices, etc., to achieve good linearity, large Effect of input range

Inactive Publication Date: 2014-02-05
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the linearity of the voltage-to-time converters mentioned in the prior art is limited by the transfer characteristics of the device, and it is difficult to further improve the linearity

Method used

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  • Wide-input-range linear voltage-to-time conversion method and wide-input-range linear VTC

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Embodiment Construction

[0020] In order to increase the input range of the traditional VTC and keep the output linear in a larger range, the present invention provides a time amplifier circuit, which is described below for details:

[0021] For the circuit structure of a wide input range linear voltage-to-time converter (VTC), see figure 1 , the realization circuit includes: two sampling switches Sh, two discharging switches Sd, two sampling capacitors CH(L) and Cref, two current sources I and two comparators Com1 and Com2.

[0022] One end of the first sampling switch Sh is connected to the analog input VH (L), and the other end is connected to one end of the sampling capacitor CH (L) and one end of the first discharge switch Sd. The other end of the sampling capacitor CH(L) is grounded. The other end of the first discharge switch Sd is connected to the inflow end of the first current source I and the negative end of the first comparator Com1. The outgoing terminal of the first current source I is...

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Abstract

The invention relates to the field of analog integrated circuit design of microelectronics, in particular to a wide-input-range linear voltage-to-time conversion method and a wide-input-range linear VTC, wherein the wide-input-range linear voltage-to-time conversion method and the wide-input-range linear VTC aim to enlarge the input range of a traditional VTC and enable the VTC to keep the linear characteristic within the large input range. According to the technical scheme, the wide-input-range linear VTC comprises two sampling switches Sh, two discharge switches Sd, two sampling capacitors CH or CL and Cref, two current sources I and two comparators Com1 and Com2, wherein H represents the word of high, and L represents the word of low. The two sampling switches Sh are turned on, and two sets of input analog voltage signals are sampled through the sampling capacitors CH or CL and Cref; then the sampling switches Sh are turned off, the discharge switches Sd are turned on, and accordingly the sampling capacitors CH or CL and Cref are discharged within the specified time; the comparators Com1 and Com2 detect voltage at the two ends of each capacitor and compare the voltage with a comparison signal. The wide-input-range linear voltage-to-time conversion method and the wide-input-range linear VTC are mainly applied to the analog integrated circuit design.

Description

technical field [0001] The invention relates to the field of analog integrated circuit design of microelectronics, in particular to a linear voltage-time converter with a wide input range. technical background [0002] Voltage to time converter (Voltage to time converter, VTC) is an important device of time domain ADC. The VTC converts the voltage signal into a time signal, and the converted time is digitally quantified by the subsequent circuit. Linearity and input range are important indicators to measure VTC performance. [0003] Above-mentioned technology has following shortcoming and deficiency at least: [0004] The input range of the traditionally proposed voltage-to-time converter is only tens to hundreds of millivolts, and the corresponding conversion time is tens of picoseconds, because only in this range can the linear output be guaranteed. In addition, the linearity of the voltage-to-time converters mentioned in the prior art is limited by device transfer char...

Claims

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Application Information

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IPC IPC(8): H03M1/10
Inventor 徐江涛朱昆昆姚素英史再峰高静
Owner TIANJIN UNIV
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