Bias circuit linearization and dynamic power control
First Claim
1. A circuit for biasing an amplifier transistor comprising a control terminal, a current-sink terminal, and a current-source terminal, the circuit comprising:
- a bias transistor including a control terminal, current-sink terminal, and a current-source terminal;
a first DC input port connected to the current sink terminal of the bias transistor;
a first resonator element operatively coupled to the current-sink terminal of the bias transistor and ground;
a second DC input port connected to the control terminal of the bias transistor;
a diode element operatively coupled to the control terminal of the bias transistor and ground;
a second resonator element operatively coupled to the control terminal of the bias transistor and ground; and
a resistive element operatively coupled to the current source terminal of the bias transistor and the control terminal of the amplifier transistor.
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Accused Products
Abstract
A transistor bias circuit is provided that is capable of biasing an amplifier transistor having a control terminal, a current-sink terminal, and a current-source terminal in order to control inter-modulation and linearize the output corresponding to radio frequency and microwave frequency ranges. Additionally, an embodiment of the present circuit is capable of dynamic power control. The transistor bias circuit according to the present invention utilizes a leakage current to alter the electrical characteristics of the amplifier transistor. The bias circuit comprises a bias transistor having a control terminal, a current-sink terminal, and a current-source terminal. Additionally, at least one DC input port, at least one resonator element, a diode element, and a resistive element is provided.
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Citations
16 Claims
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1. A circuit for biasing an amplifier transistor comprising a control terminal, a current-sink terminal, and a current-source terminal, the circuit comprising:
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a bias transistor including a control terminal, current-sink terminal, and a current-source terminal;
a first DC input port connected to the current sink terminal of the bias transistor;
a first resonator element operatively coupled to the current-sink terminal of the bias transistor and ground;
a second DC input port connected to the control terminal of the bias transistor;
a diode element operatively coupled to the control terminal of the bias transistor and ground;
a second resonator element operatively coupled to the control terminal of the bias transistor and ground; and
a resistive element operatively coupled to the current source terminal of the bias transistor and the control terminal of the amplifier transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit for biasing an amplifier transistor including a control terminal, current-sink terminal, and current-source terminal wherein the circuit is suitably adapted to utilize a bias circuitry surrounding the amplifier transistor to provide intermodulation cancellation and dynamic power control, the circuit comprising:
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means for applying an original input signal to an input port;
means for controlling flow of a leakage signal of the original input signal into the bias circuitry;
means for altering the electrical characteristics of the leakage signal to create an altered input signal; and
means for applying the altered input signal to the base of the amplifier transistor. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method, comprising:
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applying an original signal;
regulating a flow of a leakage signal of the original signal to a bias circuit;
controlling an impedance of the bias circuit to cancel intermodulation of the leakage signal;
creating an altered signal by shifting a bias point of the leakage signal;
combining the original signal and the altered signal; and
amplifying the combined signal.
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Specification