A signal processing circuit comprises a structure wherein emitters of a plurality of transistors are commonly connected, an inverting amplifier is connected to a base of each of the plurality of transistors, and an absolute value of an input signal supplied to the inverting amplifier is detected. The...http://www.google.fr/patents/US5642070?utm_source=gb-gplus-shareBrevet US5642070 - Signal processing circuit and system for detection of absolute value
Signal processing circuit and system for detection of absolute value
