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Track and hold circuit, and receiving device

A track-and-hold and circuit technology, which is applied to control the components of the amplifier, electrical components, transmission systems, etc., can solve problems such as distortion, feedback noise, affecting the signal-to-noise ratio and distortion rate of the baseband signal, and improve the distortion problem. , The effect of accurate output voltage signal

Active Publication Date: 2011-08-03
MEDIATEK INC
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AI Technical Summary

Problems solved by technology

However, when the track-and-hold circuit tracks and holds the down-converted IF signal, since the track-and-hold circuit completes the track-and-hold operation by controlling a plurality of switches therein, the charge injection generated by the plurality of switches may cause wireless Kick-back noise occurs in the front-end stage and the back-end stage of the receiving system, so it may eventually affect the signal-to-noise ratio and the signal-to-distortion ratio (SNR) of the base-band signal generated by the back-end stage. -noise ratio and distortion ratio)
In addition, the charge injection generated by the plurality of switches may partially distort the tracking signal and the corresponding digital signal, which in turn affects the receiving performance of the wireless receiving system

Method used

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  • Track and hold circuit, and receiving device
  • Track and hold circuit, and receiving device
  • Track and hold circuit, and receiving device

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Embodiment Construction

[0012] Certain terms are used throughout the specification and claims to refer to particular elements. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same element. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Includes" mentioned throughout the specification and claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described herein that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0013] figure 1 is a schematic diagram of t...

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Abstract

The present invention provides a track and hold circuit, and a receiving device. The track and hold circuit includes: a gain control circuit arranged to provide a gain value upon an input signal according to a set of control signals, wherein the gain control circuit includes a first resistor-based network and a second resistor-based network; an operational amplifier coupled to the gain control circuit and arranged to generate an output signal according to the input signal and the gain value; and a first capacitor coupled to the operational amplifier and arranged to hold the output signal between a first input terminal and a first output terminal of the operational amplifier, wherein when the operational circuit is operating, a first terminal of the first capacitor is consistently coupled to the first input terminal of the operational amplifier, and a second terminal of the first capacitor is consistently coupled to the first output terminal of the operational amplifier. The track and hold circuit, and the receiving device can improve distortion caused by feeding charge so as to more accurately generate and output voltage signals.

Description

technical field [0001] The present invention relates to a tracking and holding circuit and a receiving device, in particular to a tracking and holding circuit and a receiving device which can improve feedback noise and signal distortion. Background technique [0002] In a wireless receiving system, a track-and-hold circuit is used to track a down-converted intermediate frequency (IF) signal and maintain the tracked signal value for a predetermined time interval. Subsequently, an analog-to-digital converter (analog-to-digital converter, referred to as ADC hereinafter) converts the tracked signal into a corresponding digital signal. The corresponding digital signal is used to determine whether the voltage level of the blocker signal received by the wireless receiving system is within a predetermined voltage range. if the digital signal indicates that the voltage level of the received blocking signal is outside a predetermined voltage range, then using an adjustment mechanism ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20H04B1/10
CPCH03G3/3052H03G1/0088
Inventor 蔡鸿杰林育信罗启伦陈忠伟
Owner MEDIATEK INC
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