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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
Subject: Re: mitigating charge injection in switched capacitor systems...
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Date: Fri, 13 Dec 2002 17:00:37 -0000
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Ken Smith wrote:
> In article ,
> Josh Model wrote:
>> From my understanding, at least one cause of charge injection is the
>> source-gate capacitance of a FET switch, and a sort of fast
>> switching time
> Yes. what happens is: a charge is capacitively coupled in from the
> gate to the source when the gate moves. The channel then becomes a
> very high resistance and traps this charge as the source of the FET.
> If you are making your own gate driver for the fet, you can control
> the shape of the switching wave form to reduce this effect quite a
Vary dubious if the load is also a capacitor. It wont matter what the
ramp time of the control voltage is. Its a capacitor divider.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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