This book describes design techniques for wideband quadrature LO
generation for software defined radio transceivers, with frequencies
spanning 4GHz to around 80GHz. The authors discuss several techniques
that can be used to reduce the cost and/or power consumption of one of
the key component of the RF front-end, the quadrature local oscillator.
The discussion includes simple and useful insights into quadrature VCOs,
along with numerous examples of practical techniques.