An A/D converter adopting mixed type dual-layer folding circuit

An analog-to-digital converter and hybrid technology, applied in the direction of analog/digital conversion, DC-coupled DC amplifier, code conversion, etc., can solve the problems of high power consumption and affecting the high-frequency performance of folding circuits, etc.

Inactive Publication Date: 2008-07-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from Figure 3 that the higher the folding factor is, the more current sources are required and the more power consumption is consumed, and since the folding circuit generally adopt

Method used

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  • An A/D converter adopting mixed type dual-layer folding circuit
  • An A/D converter adopting mixed type dual-layer folding circuit
  • An A/D converter adopting mixed type dual-layer folding circuit

Examples

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Embodiment Construction

[0020] Further describe the present invention below in conjunction with accompanying drawing.

[0021] The analog-to-digital converter 40 consists of a single sample-and-hold circuit 41, a reference resistor string 42, a pre-amplification circuit 43, a resistance offset averaging and 2-time interpolation circuit 44, a rough analog-to-digital converter 45, a folding circuit 46, and 8-time interpolation of resistance The circuit 47, the comparator 48, and the encoding circuit 49 are formed through circuit connection, and its circuit block diagram is shown in Fig. 4 . The sample-and-hold circuit 41 receives the analog input signal, and the pre-amplification circuit 43 receives the output signal of the sample-and-hold circuit 41 and the incremental reference voltage generated by the reference resistor string 42 as input, and outputs W sets of differential signals, which are averaged by resistance offset and interpolated twice The circuit 44 obtains K (K=W×2) sets of differential s...

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PUM

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Abstract

The invention belongs to the integrated circuit technical field, in particular to a mixed type double-layer folding circuit analog-to-digital converter. The invention consists of a single sample-hold circuit, a reference resistance string, premagnification, resistance offset averaging and twice interpolating circuit, a rough analog-to-digital converter, a folding circuit, an resistance eight-time interpolating circuit, a comparator and a code circuit, etc.; wherein, the folding circuit consists of an amplifying circuit and an outputting circuit and makes improvement of high-speed and low-dissipation to the amplifying circuit which comprises double-layer amplifying units which are same with the number being M and leads 3 multiplied by M pairs of differential input voltage to be amplified. In the invention, the consumption of the circuit is reduced greatly and the speed is raised greatly.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an analog-to-digital converter with a folded interpolation structure. Background technique [0002] As a bottleneck in mixed-signal SoCs, high-speed analog-to-digital converters consume significant die area, power consumption, and design time. At the same time, high-speed medium-resolution analog-to-digital converters are widely used in high-speed data communications, liquid crystal display drivers, digital oscilloscopes, and hard disk drive circuits. Among many kinds of analog-to-digital converter circuit structures, the folded structure has the advantages of high speed, small area and easy compatibility with digital technology. [0003] Compared with the all-parallel analog-to-digital converter, the folding analog-to-digital converter greatly reduces the number of comparators due to the use of folding circuits, and the reduced number is related to the f...

Claims

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Application Information

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IPC IPC(8): H03M1/54H03F3/45
Inventor 任俊彦姚炳昆李宁许俊林俪毛静文
Owner FUDAN UNIV
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