System and method for biasing electrical circuits

摘要

A bias system is disclosed including a calibration bus to which a controller, a reference bias source, a master bias source, and first and second slave bias sources are coupled. The controller varies a control code sent over the calibration bus to the master bias source until a particular control code is found that causes the bias signal of the master bias source to equal a desired bias value which is provided by the reference bias source. The controller then sends the particular control code to the first and second slave bias sources to cause the first and second slave bias sources to generate a bias signal having the same desired bias value as the master bias source. Isolation between load circuits coupled to the first and second bias sources is thus enhanced while providing low noise, stable operation.