Back to results
US 7,023,270 B2Granted
High efficiency power amplifier
OwnerJunghyun Kim, Daehee Lee +2inventors
InventorsJunghyun Kim, Daehee Lee, Sanghwa Jung, Youngwoo Kwon
Life of this patent
Estimating the term…
Abstract
A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in RF applications such as mobile telephones. In the low power mode, the power consumption of the amplifier is reduced, which will increase operation time, especially important for battery-operated devices. In one implementation, the amplifier includes a number of impedance matching network units, impedance transformer, and a power stage.
Claims9
A circuit comprising:
- a primary path that includes, in series, a first impedance matching sub-circuit, a power amplifier, and a second impedance matching sub-circuit;
- a secondary path, in parallel with the primary path, comprising an impedance transformer;
- and
- a means for coupling a control signal to the power amplifier to selectively enable the primary or secondary path to present a lower impedance respective to the other path;
- whereby an inputted signal is always present in both paths and when the primary path is of lower impedance the signal is magnified and when the secondary path is of lower impedance the signal is not magnified.
2 more elements
Dependencies are inferred from the claim text.