A 5-6-GHz bipolar quadrature-phase generator

Abstract

A wide-band fully monolithic quadrature-phase generator is implemented. It consists of a bipolar frequency doubler with differential outputs and a regenerative divider with 5 mVrms maximum sensitivity. Measured residual phase noise is < ±0.5 dB for offsets between 100 Hz and 100 kHz in the 5-6-GHz band, limited by the resolution of the measurement equipment. An electronic phase tuning circuit controls the I/Q phase error to ±15° of tuning range with 0.033°/mV sensitivity. Unwanted harmonics are suppressed by over 40 dB within the working range of the multiplier. The test circuit occupies an active area of 0.26 × 0.11 mm2, and consumes 23 mW from a 2.7-V supply.