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The Transimpedance Amplifier

10 Winter 2019 IEEE SOLID-STATE CIRCUITS MAGAZINE A CirCuit for All SeASonSBehzad RazaviMMany of today s communication sys-tems incorporate a Transimpedance Amplifier (TIA). Although the TIA concept is as old as feedback ampli-fiers [1] , it was in the late 1960s and early 1970s that TIAs found wide-spread usage in optical coupling and optical communication receivers. In a patent filed in 1967, Miller proposes the circuit shown in Figure 1 [2] , which consists of two TIAs for converting a photodiode s current to a differ-ential output voltage. Additionally, these amplifiers have become popu-lar in radio-frequency (RF) receivers in the past 10 years [3]. This article deals with TIA design for optical and RF IdeaA TIA employs negative feedback to create a low input impedance.

It can be shown that the input resis-tance rises to DFR, gR RR 1 mD1 in = + + (7) and the transimpedance gain is given by R. gR Rg R 1 1 T mD Dm F 1 = 1 +-(8) To further ameliorate the voltage head-room problem, we can inject a constant current, I b, into R F to create a volt-age drop of, say, 300 mV [Figure 4(b)], obtaining VI GS11-+ bFRI DDRV ...

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  Sire, Amplifier, Enacts, Transimpedance, Re sistance, Transimpedance amplifiers

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