A 65 Nm Cmos Feedforward Transimpedance Amplifier For Optical Fibers Communications

A series of inductor loads may not be the best design criterion for improvement in circuit performance. in this work, the best compromise so far for the trade-off in power consumption, input referred noise current spectral density, with wide bandwidth, high transimpedance gain and low dc supply voltage is reported. a simulated 65 nm cmos feedforward transimpedance amplifier is introduced with a series of single pmos loads instead of a series of inductor loads. a bandwidth of 20.16 ghz with a transimpedance gain of 51.16 dbω, an input referred noise current spectral density of 34.3 p a⁄√hz, a power consumption of 1.052 mw and with a 1v dc supply voltage are presented. in addition, an active inductor load (instead of inductor load) is introduced within the 65 nm cmos feedforward transimpedance amplifier. a bandwidth of 3.75 ghz with a transimpedance gain of 42.7 dbω, an input referred noise current spectral density of 21.4 p a⁄√hz, a power consumption of 0.66 mw and with a 1v dc supply voltage are reported. this 65 nm cmos feedforward design process provides enough voltage headrom for gate-to-source terminals in amplifying transistors due to less dc voltage drop across pmos loads. as a result, this design process consumes the lowest possible power consumption especially with the single pmos loads as well as with the active inductor load.