A monolithic silicon wide-band amplifier from DC to 1 GHz

Monolithic integration of a wide-band amplifier with uniform gain from dc to 1 GHz is described. By choosing an essentially simple circuit both for construction and evaluation it is shown that the collective application of microwave transistor diffusions, double layer interconnections, beam leads, air isolation, and microstriplines on ceramic substrates extends the range of operation to beyond 1 GHZ. Gain values of 12 dB flat within 0.5 dB for a two- stage amplifier and nearly 50 dB flat within 1 dB for cascaded amplifiers from low frequencies to 1 GHz are achieved. The direction for further technological improvements is indicated.