A Wideband RF Feedback Loop including High Energy-Efficiency Invertor Structures for Silicon-based Optoelectronic Oscillator

This paper proposes an ultra-wideband RF feedback loop including high energy-efficiency invertor structures, which is tailored for silicon-based optoelectronic oscillator (OEO). The proposed RF feedback loop is composed of a wideband transimpedance amplifier, an analog phase shifter and a driver amplifier, which can provide required gain and phase of OEO. The loop achieves a trans-impedance gain of over 75 dBΩ, a tunable phase shift of 360°, an output swing of 0.5-4.5 V and a power consumption of only 143 mW. Furthermore, based on the proposed RF feedback loop, the OEO with a frequency tuning range of 4 GHz to 12 GHz is realized.