Adaptive bias current generation for switched-capacitor circuits

A technology of switching capacitors and bias currents, applied in the field of electronics, can solve problems such as undesirable

Inactive Publication Date: 2011-06-29
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This in turn may result in biasing active circuits with excessive current at times, which may be undesirable

Method used

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  • Adaptive bias current generation for switched-capacitor circuits
  • Adaptive bias current generation for switched-capacitor circuits
  • Adaptive bias current generation for switched-capacitor circuits

Examples

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Embodiment Construction

[0016] The techniques described herein can be used in switched capacitor circuits for various circuit blocks such as ΣΔADC, ΣΔDAC, filters, sampling decimators, and the like. The techniques can also be used in various applications such as wireless communications, computing, networking, consumer electronics, and the like. The technology can also be used in a variety of devices such as wireless communication devices, cellular phones, personal digital assistants (PDAs), handheld devices, wireless modems, laptop computers, cordless phones, Bluetooth devices, broadcast receivers, consumer electronic devices, etc. For clarity, the following describes the use of the techniques in a wireless communication device (which may be a cellular telephone or some other device).

[0017] figure 1 A block diagram of a design of a wireless communication device 100 is shown. For simplicity, figure 1 Only the receiver part is shown in . Also for simplicity, figure 1 Only one receive chain for...

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PUM

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Abstract

Techniques for adaptively generating bias current for a switched-capacitor circuit are described. The switched-capacitor circuit charges and discharges at least one switching capacitor at a sampling rate and may be a ADC that digitizes an analog signal at the sampling rate and provides digital samples. The switched-capacitor circuit may support multiple modes associated with different sampling rates. A bias circuit generates a bias current for the switched-capacitor circuit to be proportional to the sampling rate for a selected mode, to provide a bandwidth proportional to the sampling rate for an operational transconductance amplifier (OTA) within the switched-capacitor circuit, and to track changes in the switching capacitor(s) due to variations in integrated circuit (IC) process and temperature. The settling time of the switched-capacitor circuit may track with the multiple modes and across IC process and temperature variations.

Description

technical field [0001] The present invention relates generally to electronics and, more particularly, to techniques for generating bias currents for switched capacitor circuits. Background technique [0002] A switched capacitor circuit is a circuit that moves charge between different sampling capacitors in order to achieve the desired signal processing function. Switched capacitor circuits can accurately implement signal processing functions based on ratios of capacitor sizes (rather than absolute capacitor sizes) and sampling rates (both of which can often be obtained with high accuracy). Switched capacitor circuits are widely used to implement various circuit blocks such as sigma-delta analog-to-digital converters (ΣΔADC), sigma-delta digital-to-analog converters (ΣΔDAC), filters, sampling decimation device etc. [0003] Switched capacitor circuits typically include active circuitry, such as an operational transconductance amplifier (OTA), that helps move charge between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03F3/00H03F3/195H03F3/45
CPCH03F2200/447H03F1/303H03F3/45188H03F3/195H03M3/43H03F2200/357H03M3/392H03F3/005H03M3/454H03M3/354H03F2200/451H03F1/30H03F3/45
Inventor 王传扬全孝弘赛福拉·巴扎亚尼
Owner QUALCOMM INC
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