Abstract
A K band balanced frequency doubler using InGaP HBTs is presented, which features high conversion gain, wide bandwidth and high rejection of fundamental signal. To obtain the balanced signal, a differential amplifier with a base-collector feedback resistor is utilized. The push-pull doubler operates in a near class B region for good efficiency. This circuit has a conversion gain of 6 dB over the output frequencies from 14 GHz to 24 GHz. The fundamental frequency suppression is better than 17 dB. The MMIC chip size is 0.6 /spl times/ 0.7 mm/sup 2/.
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