Patent ID: 8593224

Claim:
A temperature compensated bias circuit of a radio frequency transistor having a control terminal, a first current carrying terminal, and a second current carrying terminal, comprising: an output providing a temperature compensated bias to a radio frequency transistor; a first transistor having a control terminal, a first current carrying terminal receiving power from a first regulated voltage source, and a second current carrying terminal coupled to the output; a second transistor having a control terminal coupled to the second current carrying terminal of the first transistor and the output, a first current carrying terminal receiving power from a second regulated voltage source, and a second current carrying terminal coupled to a ground; and a diode at an intermediate position between the second regulated voltage source and the first current carrying terminal of the second transistor, the diode determining current through the first current carrying terminal of the second transistor, and the current through the first current carrying terminal of the second transistor determines a first voltage difference between the control terminal of the second transistor and the second current carrying terminal of the second transistor.