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PVT-insensitive common-mode charge control device for charge-coupled pipeline analog-to-digital converters

An analog-to-digital converter, charge-coupled technology, applied in analog-to-digital conversion, code conversion, instruments, etc., can solve the problem that the error cannot be eliminated, and achieve the effect of accurately adjusting the common mode charge

Active Publication Date: 2017-12-22
58TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] It can be seen that V Ni The error caused by (t1) cannot be eliminated during the common-mode charge transfer, and the error is directly transmitted to the subsequent circuit, so the error must be effectively controlled

Method used

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  • PVT-insensitive common-mode charge control device for charge-coupled pipeline analog-to-digital converters
  • PVT-insensitive common-mode charge control device for charge-coupled pipeline analog-to-digital converters
  • PVT-insensitive common-mode charge control device for charge-coupled pipeline analog-to-digital converters

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and examples.

[0028] image 3 Shown is a structural block diagram of the PVT insensitive common-mode charge control circuit provided by the present invention, which includes two output common-mode adjustable charge transfer circuits 31 and 32, a scale detection and adjustment circuit 33, and a shutdown voltage replication circuit 34, 35 in the figure is the relevant common-mode charge control circuit of the next-stage pipeline circuit. image 3The connection relationship of the shown circuit is as follows: the output signals of the OUT terminals of the output common-mode adjustable charge transfer circuits 31 and 32 are all detected by the common-mode detection and adjustment circuit 33, and are compared and processed with the Vref voltage under the control of the control clock, and Connect the output feedback signal Vfb to the P control terminals of the circ...

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Abstract

The invention relates to a circuit device used for controlling common mode charges in a charge coupling assembly line analog-digital converter. The circuit device comprises two output common mode adjusting charge transmission circuits (BBD), a common mode detection adjusting circuit and a voltage turning-off copy circuit. According to the aim of the circuit device, a common mode charge problem caused by an existing charge transmission technology is restrained, and the purpose of adjusting common mode charges precisely is achieved through two adjusting modes. According to the first adjusting mode, the large-signal characteristic of a cascade amplifier is changed by adjusting voltage of a substrate of an input tube of the cascade amplifier, and therefore on-off point voltage of a whole BBD is changed. According to the second mode, the large-signal characteristic of the cascade amplifier is changed by changing grid voltage of a parallel-connection tube M4, and the on-off point voltage of the whole BBD can be changed. The two modes are respectively used for dealing with errors of the two common mode charges.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a circuit device that can be used to control common-mode charges inside a charge-coupled pipeline analog-to-digital converter. technical background [0002] In the charge-coupled pipeline analog-to-digital converter, the charge packets sampled by the charge-coupled sample-and-hold circuit will be sent to subsequent stages of charge-coupled sub-stage pipeline circuits for step-by-step comparison and quantization processing. For a charge-coupled pipeline ADC implemented with a fully differential structure, signal processing is carried out synchronously on two signal states, the positive and negative signal processing paths are complementary and symmetrical with the common mode signal as the center, and finally processed by two signal channels The difference between the results is used as the final processing result. The input voltage signal is first convert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/38
Inventor 于宗光陈珍海钱宏文季惠才封晴
Owner 58TH RES INST OF CETC
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