Hello I recently studied schematic of SDRZero http://py2wm.qsl.br/SDR/SDRZero-2.html. this sdr receiver include rf amplifier (MMIC variation) between bandpass filter and QSD. author wrote: "An RF amplifier follows, the main reason to use one here is to present resistive impedance to the QSD (quadrature sampling detector)." As I can understand connecting QSD to source with reactive impedance will produce phase/gain imbalance. is this correct? someone research this?
Regards, Andre
