Power amplifier matching circuit with dvcs
AssigneeCavendish Kinetics, Inc.
InventorRay PARKHURST
Life of this patent
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Abstract
Embodiments disclosed herein generally relate to power amplifier matching circuits used for matching impedance and harmonic control in a device, such as a cellular phone. In one example, a power amplifier matching circuit includes two DVCs, four inductors, a transistor, and a capacitor. Utilizing the two DVCs, the impedance matching ratio and the center frequency of the circuit are capable of adjustment as needed. Moreover, the inclusion of the two DVCs may also prevent harmonic frequencies from undesirably passing through the power amplifier matching circuit to the antenna of a cellular device. The power amplifier matching circuit may be used in conjunction with an amplifier, where the output of the amplifier is proportional to the current in the circuit.
Claims20
A power amplifier matching circuit, comprising:
- a first end of a first inductor electrically coupled with a power source;
- a first end of a first capacitor connected with a second end of the first inductor;
- a transistor connected with a second end of the first capacitor and the second end of the first inductor;
- a first end of a second inductor connected with the second end of the first inductor;
- a first end of a first digital variable capacitor connected with the second end of the second inductor;
- a first end of a second digital variable capacitor connected with the second end of the second inductor;
- a first end of a third inductor connected with a second end of the second digital variable capacitor;
- a second end of the third inductor electrically grounded;
- a second end of the first digital variable capacitor connected with a first end of a fourth inductor;
- and
- a second end of the fourth inductor is electrically grounded, wherein the second end of the first digital variable capacitor and the first end of the fourth inductor are connected with a RF output.
A power amplifier matching circuit, comprising:
- a first end of a first inductor electrically coupled with a power source;
- a first end of a first capacitor connected with a second end of the first inductor;
- a transistor connected with a second end of the first capacitor and the second end of the first inductor;
- and
- a first end of an amplifier connected with the first end and the second end of the first inductor, wherein a second end of the amplifier is connected with a voltage output, and wherein an output of the amplifier is proportional to a current flowing from the first end of the first inductor to the second end of the first inductor.
A power amplifier matching circuit, comprising:
- a first end of a first inductor electrically coupled with a power source;
- a first end of a first capacitor connected with a second end of the first inductor;
- a transistor connected with a second end of the first capacitor and the second end of the first inductor;
- a first end of a second inductor connected with the second end of the first inductor;
- a first end of a first digital variable capacitor connected with a second end of the second inductor;
- a first end of a third inductor connected with a second end of the first digital variable capacitor;
- a second end of the third inductor electrically grounded;
- a first end of a fourth inductor connected with the second end of the second inductor;
- a first end of a second digital variable capacitor connected with a second end of the fourth inductor;
- a first end of a fifth inductor connected with a second end of the second digital variable capacitor;
- a second end of the fifth inductor electrically grounded;
- a first end of a second capacitor connected with a second end of the fourth inductor;
- and
- a second end of the second capacitor connected with a RF output.
Dependencies are inferred from the claim text.