Ghost Tweaker
Member level 5
agc loop design
Hi everyone,
I'm designing an AGC/VGA for a wireless receiver. The signal is already downconverted fron 2GHz to 420kHz and its level is around -70dBm at the VGA input. I know the theory of loop design and VGA/AGC you learn at university. I have realized the AGC/VGA in discrete components and many problems happen. Indeed it is supposed to provide from 0dB to 96dB gain. However I can't have a claen signal for inputs of -80dBm! The gain control is very dirty to me also... I also do not have filtering in the previous stages yet...
Does someone have a good article about this stuff or already experienced with this? My AGC is an opamp/diode rectifier followed by an integrator.
Thanks for your help
Ghost
Hi everyone,
I'm designing an AGC/VGA for a wireless receiver. The signal is already downconverted fron 2GHz to 420kHz and its level is around -70dBm at the VGA input. I know the theory of loop design and VGA/AGC you learn at university. I have realized the AGC/VGA in discrete components and many problems happen. Indeed it is supposed to provide from 0dB to 96dB gain. However I can't have a claen signal for inputs of -80dBm! The gain control is very dirty to me also... I also do not have filtering in the previous stages yet...
Does someone have a good article about this stuff or already experienced with this? My AGC is an opamp/diode rectifier followed by an integrator.
Thanks for your help
Ghost