Power amplifier with switchable load
First Claim
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1. A power amplifier comprising:
- a first amplifier that includes an output electrode;
a second amplifier that includes an output electrode; and
a switchable load that includes a first electrode coupled to the output electrode of the first amplifier and a second electrode that is coupled to the output electrode of the second amplifier;
wherein the switchable load is controlled by a signal that selectively presents a first impedance to the first amplifier when the first amplifier is operational, and the second amplifier is not utilized, and presents a second impedance to the second amplifier when the second amplifier is operational, and the first amplifier is not utilized;
wherein the switchable load also includes a short preservation mechanism that preserves a second harmonic short.
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Abstract
Power amplifier with switchable load. A first amplifier that includes an output electrode is provided. A second amplifier that includes an output electrode is also provided. A switchable load that receives a control signal selectively presents a first impedance to the first amplifier when the first amplifier is operational, and the second amplifier is not utilized, and presents a second impedance to the second amplifier when the second amplifier is operational, and the first amplifier is not utilized based on the control signal.
25 Citations
19 Claims
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1. A power amplifier comprising:
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a first amplifier that includes an output electrode; a second amplifier that includes an output electrode; and a switchable load that includes a first electrode coupled to the output electrode of the first amplifier and a second electrode that is coupled to the output electrode of the second amplifier;
wherein the switchable load is controlled by a signal that selectively presents a first impedance to the first amplifier when the first amplifier is operational, and the second amplifier is not utilized, and presents a second impedance to the second amplifier when the second amplifier is operational, and the first amplifier is not utilized;
wherein the switchable load also includes a short preservation mechanism that preserves a second harmonic short. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A switchable load apparatus comprising:
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a quarter-wave transmission line that includes a first electrode for coupling to an output electrode of a first amplifier and a second electrode for coupling to an output electrode of second amplifier; a capacitor that includes a first electrode coupled to the second electrode of the quarter-wave transmission line and a second electrode; and a switch that includes a first electrode that is coupled to the second electrode of the capacitor and a second electrode that is coupled to a first predetermined signal and a third electrode for receiving a control signal;
wherein the switch selectively couples the first electrode of the switch to the first predetermined signal. - View Dependent Claims (19)
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Specification