Chapter 7Advanced Transimpedance Amplifier Design I
The basic shunt-feedback TIA from the previous chapter can be enhanced in a number of ways to meet the needs of practical applications. In the following, we discuss shunt-feedback TIAs with post amplifier, differential inputs and outputs, DC input current control, and variable or adaptive transimpedance. Then, we turn to another class of TIAs, the so-called feedforward TIAs, which includes the common-base and common-gate TIA. After that, we analyze the regulated-cascode TIA. Finally, we discuss the application of inductive broadband techniques, ultimately leading to the distributed amplifier front-end.
7.1 TIA with Post Amplifier
In Section 6.2, we discussed the use of a voltage amplifier as part of the shunt-feedback TIA. Now, we discuss the use of a voltage amplifier as a post amplifier, that is, an amplifier that follows the basic TIA as shown in Fig. 7.1. The post amplifier comes in various forms. It can be just an output buffer to drive an off-chip load [1–3], it can be a single-stage amplifier [4–6], or it can be a multistage high-gain amplifier [7–9]. The last case amounts to a TIA with a main amplifier (MA) integrated on the same chip. The combination of a TIA and a limiting amplifier is known as a limiting transimpedance amplifier [10]. In the following, we discuss the trade-offs associated with the design of a TIA with post amplifier.
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