From: Ralph McDiarmid [mailto:[email protected]]
Sent: Wednesday, March 14, 2007 1:36 PM
To: [email protected]
Subject: RE: spectrum analyser detection methods
I have two questions for the group concerning detection circuits used on
spectrum analyzers:
1. With no other changes to gain, bandwidth or transducer factors, would an
AVG detector provide a lower noise floor than a QP detector?
2. Which of these two detectors has the longer time-constant (charge &
discharge)
Thank you,
Ralph McDiarmid, AScT
Compliance Engineering Group
Xantrex Technology Inc.
Ralph:
AVERAGE will yield a lower noise floor and has a longer time constant.
BTW, AVERAGE is a little slippery. It may be created by a long time-constant
detection circuit, or it might be a digital average. And you want the average
of the linear units, not the average of the logarithmic units.
Ed Price
<mailto:[email protected]> [email protected]
NARTE Certified EMC Engineer & Technician
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (FAX)
Military & Avionics EMC Is Our Specialty
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