An ultra-wide range Bi-directional transceiver with adaptive power control using background replica VCO gain calibration

A novel transceiver with adaptive power control (APC) using a process and frequency monitor (PFM) based on a new adaptive power optimization concept is proposed. The PFM employs gain calibration with a replica VCO and operates in the background. A test chip, employing adaptive amplitude scaling (AAS), adaptive bias scaling (ABS), and adaptive supply-voltage scaling (AVS), achieved adaptive power over a wide frequency-range (0.05-3.4Gbps). At 100Mbps the measured power with APC was reduced by 75% compared to conventional architecture without APC.