INTRODUCTION xxii
Figure .2: The Motoral V551 cellular phone. Picture courtesy of A. Upton, R. Vetury, and J.
Shealy, RFMD.
The RF 2722 fulfills the functional requirement of a quad band LNA and mixer. It includes
a VCO and supports very low IF (VLIF) and direct conversion receive (DCR) architectures,
thus eliminating the need for IF SAW and RF interstage filters. The complexity of the circuit
architecture needed and the noise and linearity requirements placed by the LNA and mixer make
the technology of choice SiGe-BiCMOS.
The RF 3146 fulfills the functional requirement of a power amplifier. It includes considerable
power control circuitry and can be driven from the DAC output, thus eliminating the need for
directional couplers, detector diodes, and other power control circuitry. GaAs HBT technology
is chosen for this component in order to achieve the optimum combination of high power, high
PAE, and excellent linearity requirements at the frequency of operation.
The RF 6001 fulfills the functional requirements of a synthesizer and signal processor. To
achieve the optimum combination of low cost, high levels of integration, and low power con-
sumption, Si CMOS technology is chosen for this component.