cmos Voltage Step down/Step up detecting circuit in IC

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andrew_matiga

Joined: 21 Aug 2006
Posts: 89
Helped: 6
Location: Taipei, Taiwan

09 Sep 2008 11:24 downstep voltage

can somebody explain how a cmos voltage step-up/step-down detecting device works? thanks a alot = )

electronrancher

Joined: 24 Mar 2002
Posts: 505
Helped: 34

10 Sep 2008 1:44 simple voltage step up ic

I have never heard this term" step-up/down detecting".

Are you sure you don't mean step-up/down converter?

You can link to an example, then we will explain.

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andrew_matiga

Joined: 21 Aug 2006
Posts: 89
Helped: 6
Location: Taipei, Taiwan

10 Sep 2008 2:03 step-up/down circuit

I was actually reading some patents and i found this one: http://www.google.com/patents?id=smYVAAAAEBAJ&dq=Apparatus+for+capacitor+coupling+accelerator

I was looking at the invention's first embodiment. Please see figure 3 and 4(a and b).
Actually, its not only the detecting circuit that I was confused about but the whole cmos circuit itself. I dont understand how it was able to attain the waveforms in fig 4b. It was explained in the "summary of the invention" number 25 page 13, but I still dont get it why or how, basing on the circuit. Can you help me? thanks = )[/img]

jecyhale

Joined: 19 Feb 2008
Posts: 447
Helped: 47
Location: China

18 Sep 2008 8:48 Re: cmos Voltage Step down/Step up detecting circuit in IC

andrew_matiga wrote:

can somebody explain how a cmos voltage step-up/step-down detecting device works? thanks a alot = )

easy, use a fast responsed comparator and a delayed (slow responsed) 0dB buffer.

When voltage step-up, comparator will ouput '1', or else '0', then latch the data quickly.