A harmonic-suppressed regenerative divide-by-5 frequency divider for UWB applications

A harmonic-suppressed regenerative divide-by-5 frequency divider is proposed. Incorporating the proposed quadrature-input regenerative divide-by-2 divider (QIRD), the divide-by-5 divider suppresses the output harmonic effectively. The divide-by-5 divider improves the quadrarture phase accuracy at the output. Compared with conventional dividers, the divider achieves an output I/Q phase sequence that is tracked with the input I/Q phase sequence. The design is fabricated in TSMC 0.13-um CMOS and operated at 1.2 V. While locked at 8.6 GHz, the divide-by-5 divider achieves a minimum unwanted sideband rejection of -38 dBc.