Ryo Kitamura

An 84 dB-gain-range and 1 GHz-bandwidth variable gain amplifier using gain flattening capacitors for multi-gigabit radio

A 1 GHz wide-bandwidth digitally-controlled variable gain amplifier (VGA) with 84 dB wide gain range is presented for 60 GHz short range wireless systems. The VGA employs digitally-controlled resistors and gain flattening capacitors (GFCs) which improve in-band gain flatness. The VGA is fabricated in 90 nm CMOS. The measured result shows 84.3 dB gain tuning range from -25.3 dB to 59 dB with a 3 dB bandwidth of 1.0 GHz.

A PVT-variation tolerant fully integrated 60 GHz transceiver for IEEE 802.11ad

A PVT tolerant fully integrated 60 GHz transceiver for IEEE 802.11ad is presented. By introducing a newly proposed self-sensing LDO, the transceiver adjusts bias currents and the LDO output voltage for the PA to minimize the output power variation while relaxing the hot carrier injection (HCI) degradation. The measurement shows excellent robustness against PVT variations, demonstrating only 5 dB output power variation over -20 °C to 85 °C across process corners.