A 90-${hbox {dB}}Omega$ 10-Gb/s Optical Receiver Analog Front-End in a 0.18-$mu{hbox {m}}$ CMOS Technology

摘要

A 10-Gb/s 90-dB$Omega$ optical receiver analog front-end (AFE), including a transimpedance amplifier (TIA), an automatic gain control circuit, and a postamplifier (PA), is fabricated using a 0.18-$mu{hbox {m}}$ CMOS technology. In contrast with a conventional limiting amplifier architecture, the PA is consisted of a voltage amplifier followed by a slicer. By means of the TIA and the PA codesign, the receiver front-end provides a $-$3-dB bandwidth of 7.86 GHz and a gain bandwidth product (GBW) of 248.5 THz-$Omega$. The tiny photocurrent received by the AFE is amplified to a differential voltage swing of 900 ${hbox {mV}}_{rm pp}$ when driving 50-$Omega$ output loads. The measured input sensitivity of the optical receiver is $-$13 dBm at a bit-error rate of $10^{-12}$ with a $2^{31}-1$ pseudorandom test pattern. The optical receiver AFE dissipates a total power of 199 mW from a 1.8-V supply, among which 35 mW is consumed by the output buffer. The chip size is $1300 mu{hbox {m}}times 1796 mu{hbox {m}}$.