The collectors of transistors are connected via respective resistances to a power supply terminal receiving a power supply voltage. The emitters of the transistors are connected to a ground terminal via respective resistances. A shunt resistance, a FET, and a shunt resistance are connected in series...http://www.google.fr/patents/US7215196?utm_source=gb-gplus-shareBrevet US7215196 - Variable impedance circuit, variable gain differential amplifier, multiplier, high-frequency circuit and differential distributed amplifier
Variable impedance circuit, variable gain differential amplifier, multiplier ...
