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If there is insufficient signal swing at the output the value of feedback resistor RF needs to be increased. That will also increase noise and may make the circuit unstable. A more sensitive diode could also be tried, but those usually have higher capacitance and may also make the circuit unstable. Perhaps the signal is too small because the AC response of the circuit is inadequate. This is discussed on the following slide.
PTM Published on: 2013-06-11