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Low supply voltage pipelined folded interpolating analog-to-digital converter

An analog-to-digital converter, low power supply voltage technology, applied in the field of folded and interpolated analog-to-digital converters, and can solve problems such as conversion rate limitation of folded and interpolated analog-to-digital converters

Inactive Publication Date: 2010-02-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the power supply voltage decreases, both the folding circuit and the interpolation circuit are not only composed of single-stage circuits, but often adopt a cascaded structure, so the conversion rate of the folding and interpolation analog-to-digital converter will be limited to a certain extent

Method used

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  • Low supply voltage pipelined folded interpolating analog-to-digital converter
  • Low supply voltage pipelined folded interpolating analog-to-digital converter
  • Low supply voltage pipelined folded interpolating analog-to-digital converter

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Embodiment Construction

[0015] Further describe the present invention below in conjunction with accompanying drawing.

[0016] figure 2 It is a schematic diagram of the low-voltage pipelined folding interpolation analog-to-digital converter proposed by the present invention, and its working principle is:

[0017] (1) The analog input signal passes through the track and hold circuit 20 to obtain a hold signal.

[0018] (2) Hold signal and reference voltage The reference level generated by the resistor string 21 is used as the input signal of the coarse pre-amplification circuit 22 and the fine sub-amplification circuit 23, and the output is the difference amplified signal between the hold signal and the reference level.

[0019] (3) The output signal of the coarse sub-preamplifier circuit becomes the input signal of a part of the comparator 28, and the temperature code output is obtained through the comparison of the comparator.

[0020] (4) The output of the fine sub-amplifier circuit is connected...

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Abstract

The invention belongs to the technical field of integrated circuit, in particular to a low supply voltage pipelined folded interpolating analog-to-digital converter. The invention comprises a track and hold circuit, a reference voltage resistance string, a coarse pre-amplifier circuit, a fine pre-amplifier circuit, a first sampling switch, a folded circuit, a second sampling circuit, an interpolating circuit, a comparator and a coding circuit, wherein, the sampling circuit adopts grid voltage bootstrapped switch. The structure of the invention is able to decrease the time delay of analog-to-digital converter key route, effectively raising the conversion rate of the low supply voltage pipelined folded interpolating analog-to-digital converter.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a folding interpolation analog-digital converter suitable for low power supply voltage and ultra-high-speed analog-digital converters. Background technique [0002] The Folding Interpolation ADC is a medium precision, high conversion rate ADC. In some embedded or portable systems or equipment applications, it is required that the analog-to-digital converter can work at a low power supply voltage. However, as the power supply voltage decreases, the gain of the circuit is limited. In order to achieve sufficient gain, the usual method is to cascade more gain stages. It is well known that an unfavorable consequence of cascading more gain stages is increased time delay in the signal path. figure 1 Shown is the structural diagram of a commonly used folded interpolation analog-to-digital converter, which is mainly composed of a tracking and holding circuit 10, ...

Claims

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Application Information

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IPC IPC(8): H03M1/54
Inventor 任俊彦林俪陆焱王明硕
Owner FUDAN UNIV
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