Constant current biasing circuit for linear power amplifiers
AssigneeSkyworks Solutions, Inc.
InventorsPaul Andrys, Mark Bloom, Hugh J. Finlay, David Ripley, Terry Shie, Kevin Hoheisel
Life of this patent
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Abstract
A constant current bias approach that receives an input bias voltage and maintains a temperature independent constant current bias in a linear amplifier device. Integrated sense circuitry protects against unacceptable input voltages to guarantee bias stability. Fabrication in multiple semiconductor technologies and assembly into a single package allows for optimum cost and performance of DC bias and RF amplifier sections.
Claims26
A constant current bias circuit associated with a linear power amplifier comprising:
- an at least one resistor;
- a capacitor coupled to the least one resistor;
- a bias voltage input terminal for receipt of a bias voltage connected to the at least one resistor;
- and
- an at least one transistor connected to the at least one resistor by an electrical path resulting in a constant bias current when the bias voltage is present.
A constant current bias circuit associated with a linear power amplifier comprising:
- an at least one resistor;
- a capacitor coupled to the at least one resistor,
- means for receiving a bias voltage connected to the at least one resistor;
- and
- an at least one transistor connected to the at least one resistor by an electrical path resulting in a constant bias current when the bias voltage is present.
A method for constant current biasing, associated with a linear power amplifier, the method comprising:
- receiving an input bias voltage;
- determining if the input bias voltage is below a predetermined threshold;
- and
- generating a bias current Ibias by at least one resistor being connected by an electrical path to at least one transistor being in receipt of the input bias voltage.
Dependencies are inferred from the claim text.