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US 9,520,845 B2Granted
Supply modulation for radio frequency power amplification
AssigneeMicrosoft Technology Licensing, LLC
InventorZhancang Wang
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AssigneeMicrosoft Technology Licensing, LLC
InventorZhancang Wang
Estimating the term…
The subject matter described herein relates to supply modulation for power amplification. In one embodiment, the voltage level of the envelope with a tunable threshold voltage. The high level part of the envelope above the threshold voltage is maintained and amplified, for example, by the linear amplification process. On the other hand, the low level part of the envelope is replaced with the constant low voltage level. In amplification, the shaped low level part can be prompted to the predefined low supply voltage which may be directly output to the RFPA. By eliminating complicated amplification process on the lower level part of the envelope, the efficiency and bandwidth of the supply modulation can be improved and the circuitry can be simplified, without introducing any timing mismatch or delays.
A method comprising:
An apparatus comprising:
A supply modulator comprising:
Dependencies are inferred from the claim text.