Abstract
A frequency doubler for the conversion of an input signal at 30 GHz to an output signal at 60 GHz is presented. The conventional push-push topology is combined with an active balun at the input and with a passive three-line balun at the output. In this way, a power-efficient frequency doubler with a single-ended input and a differential output has been integrated in a 130 nm BiCMOS process. In contrast to the popular Gilbert-cell based frequency doublers, that are often used to generate a differential output signal, the presented circuit consumes only 31 mW of total dc power. An output signal with up to −13 dBm of power at the second harmonic was measured with a maximum conversion gain of 0 dB and a maximum fundamental suppression of 35 dB.
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