Published online by Cambridge University Press: 05 March 2013
This chapter reviews the DC, high-frequency, and noise characteristics of field-effect and heterojunction bipolar transistors and discusses the figures of merit and design methodology of high-frequency passive devices such as inductors, transformers, transmission lines, and fixed and variable capacitors (varactors).
Definition of an active device
We define as active an electronic device whose power gain is larger than 1 or 0dB. The power gain is made possible by the conversion of DC power into time-varying power [1].
As illustrated in Figure 4.1, high-frequency active devices can be divided into two large families: field-effect and bipolar devices. In the field-effect category, we include the MOSFET and its derivatives (LDMOS, SOI, FinFET, nanowire FET) and the high electron mobility transistor (HEMT) with its pseudomorphic (p-HEMT) and metamorphic (m-HEMT) derivatives. MOSFETs are currently fabricated in silicon with some silicon-germanium present in the source and drain regions of p-MOSFETs in advanced technology nodes. Commercial HEMTs are realized in several III-V material systems, the most popular being GaAs/InGaAs, InP/InGaAs, and AlGaN/GaN.
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