CHAPTER 7

Wideband Transconductance Amplifier Design

This chapter is devoted to simplified design with wideband transconductance amplifiers (WTAs). These ICs are similar to OTAs and current-feedback amplifiers (CFAs) in that internal characteristics (such as gain) can be controlled by external components. However, unlike OTAs and CFAs, the WTA does not require any feedback components to produce accurate gain. Without any negative feedback, there is no closed-loop phase shift. As discussed in Chapter 3, the phase shift from output back to input is the primary cause of oscillation in conventional high-speed amplifiers. The output of a WTA is a current that is proportional to the applied differential input. This provides inherent short-circuit ...

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