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US 6,888,409 B1Granted
High efficiency RF power amplifier
AssigneeIntel Corporation
InventorStewart S. Taylor
Life of this patent
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Abstract
A radio frequency (RF) power amplification system uses multiple DC power sources to achieve efficient operation. In at least one embodiment, linear operation is maintained by appropriately selecting a reference voltage at which a secondary power source is activated.
Claims23
A radio frequency (RF) amplification system, comprising:
- a power amplifier having:
- an output node to carry an RF output signal;
- and
- a power node coupled to said output node through a component having a relatively high impedance at RF frequencies of said RF output signal;
- a switch circuit to controllably couple said power node to a first power source having a first potential;
- and
- a regulator circuit to prevent a negative envelope of said RF output signal on said output node from going substantially below a predetermined voltage level during operation of said RF amplification system by controllably coupling said power node to a second power source having a second potential in response to said negative envelope.
4 more elements
A wireless transmitter, comprising:
- a power amplifier having:
- an output node to carry an RF output signal;
- and
- a power node coupled to said output node through a component having a relatively high impedance at RF frequencies of said RF output signal;
- an antenna to receive said RF output signal from said output node and to wirelessly transmit said RF output signal;
- a switch circuit to controllably couple said power node to a first power source having a first potential;
- and
- a regulator circuit to prevent a negative envelope of said RF output signal on said output node from going substantially below a predetermined voltage level during operation of said wireless transmitter by controllably coupling said power node to a second power source having a second potential in response to said negative envelope.
5 more elements
The wireless transmitter of claim-20, wherein:
- said regulator circuit includes an control amplifier to compare said negative envelope to said predetermined voltage level.
Dependencies are inferred from the claim text.