[SI-LIST] Re: Negative Voltage signal Return Path
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 16 Apr 2012 00:06:41 -0700
I = C*dv/dt.
Steve
On 4/15/2012 11:52 PM, vinod ah wrote:
> Hi All,
> I have one very basic question on how does negative signal return i.e.
> return path of a negative voltage signal. I am working of HD component
> video signal which swings from -0.3V to +1V at the connector. The signal
> comes from an amplifier (which is a single supply op-amp) and ac coupled
> before going to the connector. The amplifier is powered using a positive
> supply, so the design makes sure that output and input of op-amp is having
> positive swing signal. But since we do AC-coupling, we get negative signal
> at the connector. So i am just thinking, whole board is working on
> positive supply and 0 Volts ground, but only at connectors i see a negative
> signal i.e. ground at higher potential than the signal.
>
> So i am feeling that ground is at different potential at connectors when
> compared to other places in board? But this is not possible!!!. So where am
> i missing in understanding the return path of negative swing signal?
>
> Regards
> Vinod A H
>
>
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