CPC G05F 3/262 (2013.01) [G05F 3/242 (2013.01); H03M 1/66 (2013.01); H03M 1/742 (2013.01)] | 20 Claims |
1. A controllable temperature coefficient bias circuit comprising a variable with temperature circuit having:
(a) a reference circuit having an output and a control port;
(b) a current control circuit including a first current control element having a first temperature coefficient coupled to the control port of the reference circuit and a second current control element having a second temperature coefficient, different from the first temperature coefficient, coupled to the control port of the reference circuit and coupled in parallel with the first current control element; and
(c) a current digital-to-analog circuit coupled to the output of the reference circuit and configured to output a current level that is selectively proportional to the output of the reference circuit.
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