Abstract:This paper describes the results of an experimental study of operating GaAs Power Heterojunction Bipolar Transistors (HBTs) in Class C bias mode over C-X frequency Bands. We find that the power-added efficiency (PAE) improves and power gain decreases in Class C when compared to Class AB bias. At 6 GHz, the PAE increased by greater than 12% percentage points (from 72% in Class AB to 84.5% in Class C) with concurrent loss of 4.3 dB in power gain. At 9 GHz, the PAE increased by only 8.1% in Class C mode compared … Show more
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