A Novel mm-Wave Analog Phase Shifter Employing Closed-Loop Error-Feedback Self-Tuning I/Q Generation

A novel wideband analog phase shifter employing a self-tuning
$I/Q$
generation technique is proposed in this letter. It is fabricated using the 65-nm TSMC CMOS process and occupies a core-area of only 0.12 mm
²
as well as consuming only 11.2 mW from a 1 -V power supply. Employing a self-tuning
$I/Q$
generator in an error feedback control loop, a single-stage polyphase filter (
RC
-PPF) is used for
$I/Q$
generation by changing the gate voltage of triode-regime NMOS resistors. This self-tuning loop reduces
$I/Q$
amplitude imbalance and phase error under 0.3 dB and 1.1, respectively, within a 5-GHz bandwidth. The total rms gain and phase errors of the phase shifter are below 0.4 dB and 1.6, respectively, within the range 25–30 GHz. The
$I/Q$
generator circuit consumes a dc bias-current of only 2 mA. The tunable insertion loss varies by around 7 dB, and the 1 -dB compression point IP1 dB is in the range −7.5 ± 2.6 dBm near the center frequency. The proposed phase shifter can be a good fit for RADAR within the K- and Ka-bands, as well as for future 5G applications.