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50 Ohms "Real Resistive" impedance a Misnomer?

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July 18th 03, 04:55 PM

Richard Clark

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On 18 Jul 2003 04:50:07 -0700, (Tom Bruhns) wrote:

In precision instrumentation systems, the output is commonly levelled
or monitored through a levelling splitter (not to be confused with a
power divider), so that a virtual zero-impedance point can be
established, with a 50-ohm (or other Zo) resistor from that point to
each output. And network analyzers are commonly calibrated with
precision loads so that the imperfections in their outputs and
reflectometers and cabling can be backed out by the calibration
software.

Cheers,
Tom

Hi Tom,

H.W. Bode describes these characteristics through "Noise" Gain. It is
that portion of the "Open Loop" gain (or GBWP) that is returned to the
input.

The amount of "Noise" Gain is directly responsible for the significant
benefits (control over) of:
Input Impedance;
Output Impedance;
Noise (within the system);
Linearity (distortion);
Phase Response;
Gain variation;
Stability;
Frequency Response.

73's
Richard Clark, KB7QHC

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