A 52.5GHz-66GHz High Conversion Gain Frequency Tripler using $.13\mu \text{m SiGe}$ HBT process

A 52.5GHz-66GHz frequency tripler using
$0.13\mu\mathrm{m}$
SiGe HBT process is presented, which adopts a single balanced structure, with a high conversion gain up to 14.3dB. A maximum saturated output power
$(\mathrm{P}_{\text{sat}})$
up to 12.3dBm@57GHz is measured, with a 3-dB bandwidth of 13.5GHz (22.7
^%
relative bandwidth). A folded marchand balun is applied to transform single-end signals into differential ones, with an amplitude difference less than 0.5dB and a phase difference within
$180\pm 6$
degrees. A gain enhancing technique is also adopted. The chip size is
$620\mu\mathrm{m}\times 200\mu\mathrm{m}$
without pads and
$880\mu\mathrm{m}\times520\mu\mathrm{m}$
altogether.