Author(s): Zhou, GL (Zhou, Gaolei); Mao, XR (Mao, Xurui); Heng, W (Heng, Wei); Xie, S (Xie, Sheng); Cai, HC (Cai, Haocheng)

Source: MICROELECTRONICS JOURNAL Volume: 113 Article Number: 105047 DOI: 10.1016/j.mejo.2021.105047 Published: JUL 2021

Abstract: In this paper, a 25 Gbps inductorless optical receiver analog front-end is presented. The inverter-based modified Cherry-Hooper amplifier is proposed and adopted as main stage of the optical receiver to extend the bandwidth by alleviating Miller capacitance. The optimization of shunt-feedback transimpedance amplifier is implemented by improving the gain bandwidth product of main amplifier. In multi-stage limiting amplifier, the staggered active feedback technique is used to boost the deteriorated bandwidth. Fabricated in a 55 nm CMOS technology, the whole chip occupies an area of 770 mu m x 800 mu m, and core area is only 100 mu m x 400 mu m. The measured 3-dB bandwidth reaches 21.7 GHz, sufficient for 25-Gbps operation. For an input voltage of 3 mV(p-p), the chip achieves a BER = 10(-12) at 25-Gbps PRBS7, and 320 mV differential output voltage is delivered. From the supply voltage of 1.2 V, the test chip consumes the power of 56 mW and exhibits the power efficiency of 2.3 pJ/s.

Accession Number: WOS:000660449800001

ISSN: 0026-2692

eISSN: 1879-2391

Full Text: https://www.sciencedirect.com/science/article/pii/S0026269221000586?via%3Dihub