H03F3/45125 - CPC Classification

Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements; Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit Complementary PI types having parallel inputs and being supplied in parallel

• H03F3/4513 » {Non-folded cascode stages} 0
• H03F3/45134 » {Folded cascode stages} 1