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Sample and Hold Circuit

 
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ccw27



Joined: 13 Oct 2004
Posts: 292
Helped: 8
Post29 Dec 2004 9:55   Sample and Hold Circuit
Suppose all switches are closed during power down mode. What is the problem with this circuit? Also there is still input signal which is going into another circuitry.

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yeewong_su



Joined: 12 Oct 2004
Posts: 126
Helped: 3
Post29 Dec 2004 10:35   Sample and Hold Circuit
Why are you keep all switches closed during power down mode?
we know that the control signal of the switches is diff. no overlapped
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nand_gates



Joined: 19 Jul 2004
Posts: 898
Helped: 117
Post29 Dec 2004 10:42   Re: Sample and Hold Circuit
Input signal will get shorted to GND!!
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ccw27



Joined: 13 Oct 2004
Posts: 292
Helped: 8
Post29 Dec 2004 11:07   Re: Sample and Hold Circuit
So what is usually done in SHA circuit during power down mode?

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gevy



Joined: 17 Nov 2004
Posts: 377
Helped: 41
Location: Russia
Post29 Dec 2004 13:34   Re: Sample and Hold Circuit
If the amplifier is in power down mode, the situation of switches is indifferent,
but output signal is uncertain.
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markty



Joined: 15 Dec 2004
Posts: 60
Helped: 2
Post29 Dec 2004 13:48   Re: Sample and Hold Circuit
nand_gates wrote:
Input signal will get shorted to GND!!


I think you can let the switch all off, or just stay in sample mode and power down the opamp.
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ccw27



Joined: 13 Oct 2004
Posts: 292
Helped: 8
Post30 Dec 2004 3:18   Re: Sample and Hold Circuit
Wouldn't hold mode be better? And does it matter what the output signal is since the ADC is also disabled?

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minxin_zhou



Joined: 17 Nov 2004
Posts: 12
Post30 Dec 2004 16:01   Re: Sample and Hold Circuit
Which situation may this case happen in? It seems the input signal is shorted to ground.
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