Amplifier, a residue amplifier, and an ADC including a residue amplifier

A technology of amplifiers and capacitors, applied in analog-to-digital converters, analog-to-digital conversions, analog-to-analog conversions, etc., can solve problems such as circuits being susceptible to noise

Active Publication Date: 2014-09-10
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such circuits are susceptible to noise, and it is desirable to reduce the noise power being sampled

Method used

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  • Amplifier, a residue amplifier, and an ADC including a residue amplifier
  • Amplifier, a residue amplifier, and an ADC including a residue amplifier
  • Amplifier, a residue amplifier, and an ADC including a residue amplifier

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Embodiment Construction

[0019] figure 1 is a circuit diagram of an amplifier constituting an embodiment of the present invention. The amplifier (generally designated 10) may be used, for example, as a residual amplifier between stages of a pipelined analog-to-digital converter. However, it can also be used in other circuits where a signal needs to be taken onto a sampling capacitor, with the gain-enhanced form of that signal being the output.

[0020] In general, amplifier 10 includes an input node 12 and an output node 14 . The amplifier also includes a gain block 16 having a gain block inverting input 18 , a gain block non-inverting input 20 and a gain block output 22 . The gain block output 22 may be directly connected to the output node 14, as shown, or may be selectively connected to the output node via further circuitry, such as a switch, where it is desired to ensure that the output node 14 may present a high impedance.

[0021] Gain block inverting input 18 is connected to output node 12 t...

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PUM

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Abstract

An amplifier, comprising: an input node; an output node; a gain stage having a gain stage inverting input, a gain stage non-inverting input and a gain stage output; a feedback capacitor connected in a signal path between the gain stage output and the gain stage inverting input; a sampling capacitor connected between the input node and the gain stage non-inverting input, and a controllable impedance in parallel with the feedback capacitor, wherein the controllable impedance is operable to switch between a first impedance state in which it does not affect current flow through the feedback capacitor, and a second impedance state in which it cooperates with the feedback capacitor form a bandwidth limiting circuit.

Description

technical field [0001] The invention relates to an amplifier, a residual amplifier and an ADC comprising a residual amplifier. Background technique [0002] Amplifier circuits are known for use in conjunction with sampling circuits to acquire and hold signals and apply gain to them. Such circuits are susceptible to noise, and it is desirable to reduce the noise power being sampled. This amplifier and sampling circuit combination can also be used to form the difference between two signals. Such an amplifier may be provided in an analog-to-digital converter (ADC) to amplify the residual error passed from one stage of a pipeline ADC to a subsequent stage. Contents of the invention [0003] According to a first aspect of the present invention, there is provided an amplifier comprising: [0004] input node; [0005] output node; [0006] a gain stage having a gain stage inverting input, a gain stage non-inverting input, and a gain stage output; [0007] a feedback capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12H03F3/45
CPCH03F3/45183H03F3/45076H03M3/00H03M1/164
Inventor C·G·莱登C·P·赫里尔D·汉弗斯顿
Owner ANALOG DEVICES INT UNLTD
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