Apparatus and method for reduced sample rate class S RF power amplifier
AssigneeSamsung Electronics Co., Ltd.
InventorsErnesto Jeckeln, Breck Lovinggood, Michael Brobston
Life of this patent
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Abstract
A Class S RF power amplifier for use in a radio frequency (RF) transmitter. The Class S power amplifier comprises a delta-sigma modulator that receives an analog modulated RF carrier and generates a pulse-width modulated binary signal. The Class S power amplifier also comprises a switch mode power amplifier that receives the pulse-width modulated binary signal generated by the delta-sigma modulator and generates an output carrier signal that switches between a fully on state and a fully off state. The sampling rate of the delta-sigma modulator is less than four times the frequency of the output carrier signal generated by the switch mode power amplifier.
Claims24
For use in a radio frequency (RF) transmitter, a Class S RF power amplifier comprising:
- a delta-sigma modulator capable of receiving an analog modulated RF carrier and generating a pulse-width modulated binary signal;
- and
- a switch mode power amplifier capable of receiving the pulse-width modulated binary signal generated by the delta-sigma modulator and generating an output carrier signal that switches between a fully ON state and a fully OFF state, wherein a sampling rate of the delta-sigma modulator is less than four times the frequency of the output carrier signal generated by the switch mode power amplifier.
For use in a wireless network capable of communicating with a plurality of subscriber stations, a base station including a radio frequency (RF) power amplifier, the RF power amplifier comprising:
- a delta-sigma modulator capable of receiving an analog modulated RF carrier and generating a pulse-width modulated binary signal;
- and
- a switch mode power amplifier capable of receiving the pulse-width modulated binary signal generated by the delta-sigma modulator and generating an output carrier signal that switches between a fully ON state and a fully OFF state, wherein a sampling rate of the delta-sigma modulator is less than four times the frequency of the output carrier signal generated by the switch mode power amplifier.
A wireless network comprising a plurality of base stations capable of communicating with a plurality of subscriber stations, wherein each of the base stations comprises:
- a radio frequency (RF) power amplifier comprising:
- a delta-sigma modulator capable of receiving an analog modulated RF carrier and generating a pulse-width modulated binary signal;
- and
- a switch mode power amplifier capable of receiving the pulse-width modulated binary signal generated by the delta-sigma modulator and generating an output carrier signal that switches between a fully ON state and a fully OFF state, wherein a sampling rate of the delta-sigma modulator is less than four times the frequency of the output carrier signal generated by the switch mode power amplifier.
A method of operating a radio frequency (RF) transmitter comprising the steps of:
- receiving an analog modulated RF carrier in a delta-sigma modulator;
- generating in delta-sigma modulator a pulse-width modulated binary signal;
- receiving the pulse-width modulated binary signal in a switch mode power amplifier;
- and
- generating in the switch mode power amplifier an output carrier signal that switches between a fully ON state and a fully OFF state, wherein a sampling rate of the delta-sigma modulator is less than four times the frequency of the output carrier signal generated by the switch mode power amplifier.
Dependencies are inferred from the claim text.