A 0.18 mu m CMOS linear-in-dB AGC post-amplifier for optical communications

作者：Aznar Francisco^*; Celma Santiago; Calvo Belen

来源：Microelectronics Reliability, 2011, 51(5): 959-964.

DOI：10.1016/j.microrel.2011.02.001

This paper presents a fully integrated 10GBase-LX4 Ethernet receiver front-end automatic gain control amplifier realized in a 0.18 mu m CMOS process. Based on a very compact and reliable inductorless design, the proposed differential post-amplifier, comprises three main digitally programmable gain stages, a DC offset cancellation network and an automatic gain feedback control loop. Experimental results demonstrate a -3 dB cut-off frequency above 2.3 GHz over a -3 to 33 dB linear-in-dB controlled gain range with a sensitivity of 2.0 mV(p-p) with a BER of 10(-12) at 2.5 Gb/s. For the aforementioned standard, 3.125 Gb/s, an input dynamic range above 50 dB is achieved, from 2.5 mV(p-p) to 800 mV(p-p), indicating a BER of 10(-12). The chip core area is 0.3 x 0.3 mm(2) and it consumes 58 mW with a single supply voltage of 1.8 V.

• 出版日期2011-5