A 135-183 GHz Frequency Sixtupler in 250 nm InP DHBT Process
A technique to design a broadband two-stage frequency tripler is proposed. The 1st and the 2nd harmonics obtained from the first stage are mixed in the second stage, getting the 3rd harmonic. Between the two stages, there is a two-pole filter which manipulates the amplitude of the 1st and the 2nd harmonics, to get the 3rd harmonic having equal amplitude over a large bandwidth. Together with a frequency doubler and an amplifier, this frequency tripler is used in a frequency sixtupler which is implemented in 250 nm InP DHBT. For Pin= 6.3 dBm, the sixtupler has an output power between 0 dBm to 4.6 dBm in the output frequency range from 135 GHz to 183 GHz. It exhibits up to 13 dBc rejection ratio of the undesired 4th, 5th, and 7th harmonics. The sixtupler consumes a dc power of 100 mW, and achieves a peak power efficiency of 2.5%.