Sharing operational amplifier between two stages of pipelined ADC and/or two channels of signal processing circuitry
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United States of America Patent
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Dec 12, 2006
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app pub date -
Aug 26, 2005
filing date -
Aug 26, 2005
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Abstract
A mechanism for discharging parasitic capacitance at an input of an operational amplifier, which is shared between two stages of a pipelined analog-to-digital converter and/or two channels of signal processing circuitry, before the amplifier configuration of the stages/channels is switched. The discharging act occurs when a short reset pulse is generated between two clock phases. The short reset pulse is applied to a switch connected to the operational amplifier input. When the reset pulse closes the switch, a discharge path is created and any parasitic capacitance at the operational amplifier input is discharged through the path. The discharging of the parasitic capacitance substantially mitigates the memory effect and the problems associated with the memory effect.
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