[SI-LIST] Re: Fwd: About input impedance of a operating receiver
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 08 Apr 2013 03:41:27 -0700
I thought that this was answered already but do not see the replies.
The transistor gates on the die appear capacitive. The package
interconnect is between those gates and the PCB.
Yes impedance is frequency dependent.
You can TDR, or perform S11 measurements on devices to characterize
impedance as seen from the outside.
Steve.
On 4/8/2013 3:23 AM, XingMing Li wrote:
> Hi experts,
> I have some questions about the input impedance of a operating IC (work as
> a reciever). I think most of the recievers are CMOS based, then the input
> of the IC is conneting with the gate, so the impedance is high. However,
> most IC models give out package inductance and load capacitors, does it
> mean that the impedance depands on the frequency?
> Is there any way to measure the input impedance of a operating IC? Thank
> you.
>
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