The bias control selectively provides for bias of a power amplifier based upon a bandgap voltage generated by the bias control, or by a bias voltage external to the bias control. A controller controls the selection of either the bandgap voltage or external bias voltage. The bias control is fabricated...http://www.google.de/patents/US6617928?utm_source=gb-gplus-sharePatent US6617928 - Configurable power amplifier and bias control
