AN INSTANTANEOUS RESPONSE CMOS OPTICAL RECEIVER IC WITH WIDE DYNAMIC-RANGE AND EXTREMELY HIGH-SENSITIVITY USING FEEDFORWARD AUTO-BIAS ADJUSTMENT

An instantaneous response CMOS optical receiver IC is described with wide input dynamic range and high sensitivity, In a TCM (time compression multiplexing)-TDMA (time division multiple access) fiber-optic subscriber system, a receiver should be able to handle burst-data packets with different amplitude. This requires quick response and a wide dynamic range, Instantaneous response is achieved with a new feedforward auto-bias adjustment technique, In addition, multistaged offset compensation provides a wide dynamic range without any external elements and adjustments, Using these design techniques, an optical receiver IC was fabricated in a standard 0.8-mu m CMOS technology, The receiver has a wide dynamic range of more than 25 dB for burst mode optical input at 29 Mb/s, It has high transimpedance gain of 150 dB Omega and high sensitivity of -42 dBm with stable operation for FET threshold voltage and power supply voltage fluctuation.