Capacitor-based exponential programmable gain amplifier

摘要

A CMOS programmable gain amplifier (10) is disclosed which provides exponential gain using a single gain element (19) which may be implemented in either bipolar or CMOS technology. An embodiment of the present invention includes a first and second sampling impedance (12, 14), a first and second feedback impedance (16, 18) and a gain element (19). The gain element (19) having an inverting input, a non-inverting input and an output. The inverting input connects to the first sampling impedance (12). The non-inverting input connects to the second sampling impedance (14). The first feedback impedance (16) connects between the inverting input and the output. The second feedback impedance (18) connects between the non-inverting input and the output.