Polar transmitter using multi-phase buck converter
AssigneeClairvoyant Technology LLC
InventorThomas J. Frederick
Life of this patent
Estimating the term…
Abstract
A polar transmitter for an RFID reader and a system using the polar transmitter are disclosed. An RFID system according to at least some embodiments of the invention includes a polar transmitter, a receiver to receive responses from RFID tags, and a coupler connected to the polar transmitter, the receiver and one or more antennas. In at least some embodiments, the polar transmitter of the RFID system includes an envelope amplifier with a multi-phase buck converter to provide an envelope signal and a phase modulator connected to a power amplifier to phase modulate the power amplifier using a phase signal. In at least some embodiments, the polar transmitter of the RFID system transmits OPR-ASK signals to reduce AM modulation depth and provide a continuous phase signal for the phase modulator.
Claims20
A radio frequency identification (RFID) system comprising:
- a receiver to receive responses from RFID tags;
- and
- a polar transmitter, the polar transmitter further comprising:
- a power amplifier to produce a transmitter output signal;
- and
- an envelope amplifier connected to the power amplifier to supply an envelope signal to the power amplifier, the envelope amplifier further comprising a multi-phase buck converter.
A method of operating a transmitter for a radio frequency identification (RFID) system, the method comprising:
- producing, using a processor, a sampled data envelope amplifier signal and a sampled data phase signal;
- providing, using the processor, the sampled data envelope amplifier signal to an envelope amplifier including a multi-phase buck converter;
- supplying, using the processor, an envelope signal from the envelope amplifier to a power amplifier;
- and
- phase modulating, using the processor, the power amplifier using the sampled data phase signal to produce a transmitter output signal from the envelope signal.
Apparatus for radio frequency identification (RFID) comprising:
- means for producing a sampled data envelope amplifier signal and a sampled data phase signal;
- means for providing the sampled data envelope amplifier signal to an envelope amplifier including a multi-phase buck converter;
- means for supplying an envelope signal from the envelope amplifier to a power amplifier;
- and
- means for phase modulating the power amplifier using the sampled data phase signal to produce a transmitter output signal from the envelope signal.
A non-transitory storage medium that includes instructions that are executable by a processor for causing the processor to perform operations related to a radio frequency identification (RFID) system, the operations comprising:
- producing a sampled data envelope amplifier signal and a sampled data phase signal;
- providing the sampled data envelope amplifier signal to an envelope amplifier including a multi-phase buck converter;
- supplying an envelope signal from the envelope amplifier to a power amplifier;
- and
- phase modulating the power amplifier using the sampled data phase signal to produce a transmitter output signal from the envelope signal.
Dependencies are inferred from the claim text.