Dynamic Biasing Systems and Methods
First Claim
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1. A dynamic biasing method comprising:
- capacitively coupling to a gate terminal of a first field-effect transistor, a first waveform that is generated at a drain terminal of the first field-effect transistor;
deriving a first feedback signal from the capacitively coupled waveform present at the gate terminal of the first field-effect transistor;
repetitively sampling the first feedback signal and generating therefrom, a first time-varying gate bias signal; and
combining the first time-varying gate bias signal with a first steady-state DC bias voltage to generate a first dynamic gate biasing signal that operates upon the first field-effect transistor for setting a first source-drain voltage in the first field-effect transistor.
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Abstract
Dynamic biasing methods and circuits are described. The described methods generate bias voltages that are continuously varied so as to control stress voltages across transistors used within a cascode stack.
35 Citations
20 Claims
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1. A dynamic biasing method comprising:
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capacitively coupling to a gate terminal of a first field-effect transistor, a first waveform that is generated at a drain terminal of the first field-effect transistor; deriving a first feedback signal from the capacitively coupled waveform present at the gate terminal of the first field-effect transistor; repetitively sampling the first feedback signal and generating therefrom, a first time-varying gate bias signal; and combining the first time-varying gate bias signal with a first steady-state DC bias voltage to generate a first dynamic gate biasing signal that operates upon the first field-effect transistor for setting a first source-drain voltage in the first field-effect transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A dynamic bias circuit comprising:
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a coupling capacitor located between a drain terminal and a gate terminal of a first field effect transistor for coupling to the gate terminal, a first waveform that is generated at the drain terminal of the first field-effect transistor; a first resistor network configured for generating a first feedback signal from the capacitively coupled waveform present at the gate terminal of the first field-effect transistor; a sampling circuit for repetitively sampling the first feedback signal and generating therefrom, a first time-varying gate bias signal; a second resistor network configured for generating a first steady-state DC bias voltage; and an operational amplifier circuit configured for combining the first time-varying gate bias signal with the first steady-state DC bias voltage to generate a first dynamic gate biasing signal that operates upon the first field-effect transistor for setting a first source-drain voltage in the first field-effect transistor.
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- 14. The bias circuit of claim 14, wherein the first field-effect transistor is coupled to a second field-effect transistor to form at least one of an upper or a lower leg of a cascode stack.
Specification