Abstract
The small-signal amplifier performance at 40.5 GHz is reported for a GaAs permeable base transistor (PBT) having a base grating of 3200-A periodicity and 1-mm periphery. The device was embedded in a microstrip circuit with appropriate matching networks and biased for optimal small-signal gain with V be = 0.2 V, V ce = 2.0 V, and I ce = 59 mA. The prototype amplifier achieved 11 dB of stable gain at 40.5 GHz. The circuit design was facilitated by the moderate impedance levels and highly unilateral nature of the PBT.
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