High Linearity Transimpedance Amplifier In 0.18-Mu M Cmos Technology For 20-Gb/S Pam-4 Receivers

In this paper, a high-linearity transimpedance amplifier (TIA) with automatic gain control (AGC) was designed in 0.18-mu m CMOS Technology. For 700-mu A input current amplitude, the total harmonic distortion (THD) of the TIA can be below 5%. The bandwidth of the TIA is 7.29-GHz, and its input referred current density is about 23.6-pA/root Hz. The TIA can be used in 20-Gb/s four-level pulse amplitude modulation (PAM-4) optical receivers. The power dissipation of the chip is 37.8-mW, and the chip area is 0.307-mm(2).