October 2017
Intermediate to advanced
592 pages
20h 47m
English
Content preview from Analysis and Design of Transimpedance Amplifiers for Optical Receivers
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Chapter 8Advanced Transimpedance Amplifier Design II
In the following, we explore ways to reduce the noise by replacing the noisy feedback resistor of the shunt-feedback TIA with a capacitive, optical, or active-feedback device. Then, we discuss the current-mode TIA in which the voltage amplifier is replace by a current amplifier. After that, we look at photodetector bootstrapping, a technique to reduce the detector's effective capacitance. Finally, we turn to TIAs for specialized applications, such as burst-mode receivers and analog receivers.
8.1 TIA with Nonresistive Feedback
Capacitive-Feedback TIA with Differentiator
In medium- and low-speed applications, a large portion of the TIA's input-referred noise current originates from the feedback resistor(s) (cf. Section 6.3). In principle, we can get rid of this noise by replacing the feedback resistor with a noise-free feedback capacitor. But unfortunately, this replacement turns the TIA into an integrator, which severely distorts the signal waveforms.
One solution to this problem is to follow the integrator with a differentiator, as shown in Fig. 8.1(a), thus equalizing the frequency response [1, 2]. Assuming large voltage gains for 
and 
, the low-frequency transimpedance of this circuit is [1]
and its input-referred noise ...
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