Transmitter with improved power efficiency
First Claim
1. A power amplifier (PA) line-up comprising:
- a driver having a driver output;
a PA having a PA input and a PA output;
a first matching circuit having a first matching circuit output coupled to the PA input and having a first matching circuit input, the first matching circuit configured to receive a signal from the driver output and impedance match the signal to the PA input and the driver output;
a second matching circuit having a second matching circuit input coupled to the PA output, a third matching circuit input, and a second matching circuit output configured to be coupled to a filter input, the second matching circuit configured to impedance match the signal to the filter input and at least one of the PA output and the driver output;
a first transmission line coupled to the third matching circuit input; and
a first switch coupled to the driver output, the first switch having a first switch output configured to selectively couple the driver to one of the second matching circuit via the first transmission line and the first matching circuit based upon a pre-determined output power level for the signal.
21 Assignments
0 Petitions
Accused Products
Abstract
A power amplifier (PA) line-up (210) and a method (500) for more efficiently utilizing battery power are disclosed. PA line-up (210) includes a driver (220), a matching circuit (214), and a PA (230) coupled to a matching circuit (216), wherein matching circuit (216) is configured to be coupled to a filter (260). PA line-up (210) includes a transmission line (260) coupled to matching circuit (216) and a switch (262) configured to selectively couple driver (220) to either matching circuit (214) or matching circuit (216) such that signal (205) is capable of by-passing PA (230) when signal (205) does not need to be amplified by PA (230). Furthermore, PA line-up (210) may include a second transmission line (250) so that signal (205) is capable of by-passing a driver (220) and a PA (230) when signal (205) does not need to be amplified by driver (220) and PA (230).
26 Citations
22 Claims
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1. A power amplifier (PA) line-up comprising:
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a driver having a driver output; a PA having a PA input and a PA output; a first matching circuit having a first matching circuit output coupled to the PA input and having a first matching circuit input, the first matching circuit configured to receive a signal from the driver output and impedance match the signal to the PA input and the driver output; a second matching circuit having a second matching circuit input coupled to the PA output, a third matching circuit input, and a second matching circuit output configured to be coupled to a filter input, the second matching circuit configured to impedance match the signal to the filter input and at least one of the PA output and the driver output; a first transmission line coupled to the third matching circuit input; and a first switch coupled to the driver output, the first switch having a first switch output configured to selectively couple the driver to one of the second matching circuit via the first transmission line and the first matching circuit based upon a pre-determined output power level for the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power amplifier (PA) line-up comprising:
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a pre-driver having a pre-driver output; a driver having a driver input and a driver output; a first matching circuit having a first matching circuit output coupled to the driver input and having a first matching circuit input, the first matching circuit configured to receive a signal from the pre-driver output and impedance match the signal to the first driver input and the pre-driver output; a PA having a PA input and a PA output; a second matching circuit having a second matching circuit input coupled to the driver output and having a second matching circuit output coupled to the PA input, the second matching circuit configured to receive the signal from the driver output and impedance match the signal to the driver output and the PA input; a third matching circuit having a third matching circuit input coupled to the PA output, a fourth matching circuit input, and a third matching circuit output configured to be coupled to a filter input, the third matching circuit configured to impedance match the signal to the filter input and at least one of the PA output and the pre-driver output; a transmission line coupled to the fourth matching circuit input; and a first switch having a first switch input coupled to the pre-driver output, wherein the first switch is configured to selectively couple the pre-driver to one of the third matching circuit via the transmission line and the first matching circuit based upon a pre-determined output power level for the signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification