Local oscillator clock shaping for pre-distortion
AssigneeAnalog Devices, Inc.
InventorsChristopher Mayer, Tao Yu, Gregory Patrick Davis
Life of this patent
Estimating the term…
Abstract
Apparatus and methods for pre-distorting a radio frequency transmit signal based on local oscillator clock shaping are disclosed. In certain embodiments, one or more clock signals generated by a local oscillator and used for mixing in a transceiver are shaped to account for non-linearity of a power amplifier that amplifies the radio frequency transmit signal. Such pre-distortion can be performed in addition to or alternatively to performing digital pre-distortion on a digital representation of the radio frequency transmit signal.
Claims20
A radio frequency communication system comprising:
- a power amplifier configured to amplify a radio frequency transmit signal;
- and
- a transceiver configured to output the radio frequency transmit signal, wherein the transceiver includes at least one mixer configured to generate the radio frequency transmit signal based on providing frequency upconversion to at least one baseband transmit signal, and a local oscillator configured to pre-distort the radio frequency transmit signal to compensate for a non-linearity of the power amplifier by providing one or more shaped clock signals to the at least one mixer.
A transceiver comprising:
- a digital transmit circuit configured to generate at least one baseband transmit signal;
- at least one mixer configured to generate a radio frequency transmit signal based on providing frequency upconversion to the at least one baseband transmit signal;
- and
- a local oscillator configured to pre-distort the radio frequency transmit signal by providing one or more shaped clock signals to the at least one mixer.
A method of pre-distortion in a transceiver, the method comprising:
- generating at least one baseband transmit signal using a digital transmit circuit;
- generating a radio frequency transmit signal based on mixing the at least one baseband transmit signal using at least one mixer;
- and
- pre-distorting the radio frequency transmit signal by providing one or more shaped clock signals from a local oscillator to the at least one mixer.
Dependencies are inferred from the claim text.