High-sampling-rate broadband track and hold circuit

A technology of tracking and holding and high sampling rate, which is applied in the electronic field, can solve problems such as instability, achieve high sampling rate, realize matching characteristics, and ensure stability

Active Publication Date: 2017-09-22
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above-mentioned problems in the prior art, the GaAs HBT-based high-sampling-rate broadband track-and-hold circuit solves the instability caused by the traditional switch emitter follower (SEF) structure driving a large capacitor, and aims to improve the track-and-hold circuit sampling rate and bandwidth

Method used

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] Combine below figure 1 The unit of the present invention is described in detail.

[0024] The present invention includes an input buffer unit IB, a tracking / hold switch T / H, a holding capacitor CH and an output buffer unit OB. The input buffer unit IB is used to separate the signal source from the sampling part, and adjust the signal amplitude according to the output requirements to To provide a consistent signal gain, the first output of the input buf...

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Abstract

The invention discloses a high-sampling-rate broadband track and hold circuit and relates to the technical field of electrons. The track and hold circuit comprises an input buffer unit IB, a track/hold switch T/H, a holding capacitor CH and an output buffer unit OB. A full-differential circuit structure is introduced to realize good common-mode noise suppression ability; through the input and output buffers having emitter degeneration resistors, linearity of the track and hold circuit is improved; an improved switch emitter follower having a Schottky diode is adopted as a track and hold switch, so that circuit stability is improved; and the track and hold circuit is designed by utilizing a GaAs HBT device having high cut-off frequency and good base-emitter match, thereby solving the defects of low sampling rate and narrow bandwidth of an existing sampling and hold circuit.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a high sampling rate broadband tracking and holding circuit. Background technique [0002] A track-and-hold amplifier can track or maintain the level value of an input analog signal, and is often used as a key front-end component of an analog-to-digital converter (ADC). A track-and-hold amplifier is composed of a sampling switch with a hold capacitor. In track mode, its output tracks the input signal. When the track-hold switch is turned on, its output remains constant. To accurately digitize the signal, most analog-to-digital converters require a track-and-hold amplifier at the input. The introduction of the track-and-hold amplifier improves the dynamic performance of the analog-to-digital converter, and it suppresses the decline of the spurious-free dynamic range index caused by the clock aperture jitter. Especially in the ultra-high-speed analog-to-digital converter, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
CPCH03K19/017545
Inventor 吕红亮李少军杨施政张义门张玉明武岳
Owner XIDIAN UNIV
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