Radio Frequency Integrated Circuit Design - Webs

398 Radio Frequency Integrated Circuit Design
Figure 10.54 Feedback linearization techniques.
including techniques to remove envelope variations. The interested reader is
referred to [7].
10.22 CMOS Power Amplifier Example
Recently, a number of CMOS power amplifiers have been published [9–16].
While CMOS is not likely to be the technology of choice for standalone power
amplifiers, they are of interest in single-chip radios. Examples of CMOS power
amplifiers include one that had an output power of over 2W in the 2.4-GHz
region [15].
In Figure 10.55, a CMOS power amplifier in a 0.8-�m process at 900
MHz is shown [16]. This was designed for a standard that had constant amplitude
waveforms, so linearity was of less importance. The cascode input stage operates
Figure 10.55 Power amplifier example.