Re: NEC-LIST: NOISE FIGURE MEASUREMENTS

Zvi:

To answer your questions:
1) No
2) Yes
3) Can't answer without more information on the impedances involved and the
values of C and R.

I think you are going at this the wrong way, but without knowing your
intent, I can't be more helpful.

Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
585 442 3909
j.schanker_at_ieee.org

"Zvi Frank" <Zvi.Frank_at_mti-group.co.il> writes:
> Hallo All,
> I have a question concerning measurement of the Noise figure
> of a high impedance amplifier. First is this measurement accurate using
> a standard HP Agilent NF meter. Does the device under test have to be
> matched to 50 ohms. Second If I now add a passive circuit before the DUT
> to simulate the antenna impedance , is this an accurate measurement ?
> Why does the noise figure increase radically although I only add a small
> capacitance and small resistance in series.?
> Any comments or ideas on this subject will appreciated .
> Thank you,
> Zvi frank
>
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