A novel multistage active frequency multiplier

A new frequency multiplier, consisting in cascaded single-ended frequency doublers, is proposed as a promising constituent for Ka-band signal sources. Impedance matching at each interstage harmonic frequency is performed directly between transistors by means of a single transmission line. This multiplier translates a low-GHz input signal (∼ 0 dBm), with a conversion gain, into an output as a local oscillator, resulting in eliminated drive amplifiers. The validity of this topology is demonstrated by two, and three-stage multipliers to 14.25 GHz and 28.5 GHz, respectively, developed using medium power (H)FETs.