This paper presents the analysis of CMOS re-configurable multi-standard radio receivers biasing targeting the bias circuit optimum design taking into account the RF design specifics, in order to immunize the receiver’s building blocks key parameters to process and temperature variation effects. A constant – gmR current reference accomplishes the task by generating a bias current that tracks with process and temperature. The biasing block circuit implementation is described for both the high frequency and the baseband parts of a multi-standard receiver and an analysis on the tracking accuracy is presented.

Keywords: Software defined radio, Direct conversion receiver, Low noise amplifier, Negative feedback amplifier, Constant-gm biasing.