akrcal
Member level 1
Hello All,
I have two questions:
(a) What is delayed AGC and how it is diffferent from simple AGC. What kind of AGC is generally used in BPSK/QPSK RF receivers. Simple AGC or delayed? I need some good reference material or schematic diagram of Delayed AGC circuit.
(b) While measuring Noise figure of a receiver, is it necessary to deactivate the AGC loop? When I am measuring noise figure of receiver with AGC in operation then noise figure value from the noise figure meter is coming out very large(around 20-25dB) but when AGC is not in operation then the noise figure is coming out to be around 4dB. Where is the problem? Can anyone help in this regard?
Regards,
Akrcal
I have two questions:
(a) What is delayed AGC and how it is diffferent from simple AGC. What kind of AGC is generally used in BPSK/QPSK RF receivers. Simple AGC or delayed? I need some good reference material or schematic diagram of Delayed AGC circuit.
(b) While measuring Noise figure of a receiver, is it necessary to deactivate the AGC loop? When I am measuring noise figure of receiver with AGC in operation then noise figure value from the noise figure meter is coming out very large(around 20-25dB) but when AGC is not in operation then the noise figure is coming out to be around 4dB. Where is the problem? Can anyone help in this regard?
Regards,
Akrcal