US 11,962,338 B2 · Equalization filter calibration in a transceiver circuit

Abstract

Equalization filter calibration in a wideband transmission circuit is provided. The transceiver circuit generates a radio frequency (RF) signal(s) from a time-variant modulation vector and a power amplifier circuit(s) amplifies the RF signal(s) based on a modulated voltage. The transceiver circuit is configured to apply an equalization filter to the time-variant modulation vector to thereby compensate for a voltage distortion filter created at the output stage of the power amplifier circuit(s). In embodiments disclosed herein, a calibration circuit can be configured to calibrate the equalization filter across multiple frequencies within a modulation bandwidth of the power amplifier circuit to generate a gain offset lookup table (LUT) and a delay LUT. As a result, the equalization filter can be dynamically adapted to reduce undesired instantaneous excessive compression and/or spectrum regrowth resulting from the voltage distortion filter across the modulation bandwidth of the power amplifier circuit.

Claims18

Dependent claims

A transceiver circuit comprising:

a memory circuit;
and
a calibration circuit coupled to a power amplifier circuit and configured to:
determine and store a plurality of gain offset entries in a gain offset lookup table (LUT) in the memory circuit to correlate a plurality of calibrated frequencies comprising a center frequency and multiple non-center frequencies within a modulation bandwidth of the power amplifier circuit with a plurality of gain offsets, respectively, wherein each of the plurality of gain offsets is determined relative to a reference frequency within the modulation bandwidth;
and
determine and store a plurality of delay offset entries in a delay offset LUT in the memory circuit to correlate the plurality of calibrated frequencies with a plurality of delay factors, respectively.

3 more elements

A method for calibrating an equalization filter in a transceiver circuit comprising:

determining and storing a plurality of gain offset entries in a gain offset lookup table (LUT) to correlate a plurality of calibrated frequencies comprising a center frequency and multiple non-center frequencies within a modulation bandwidth with a plurality of gain offsets, respectively, wherein each of the plurality of gain offsets is determined relative to a reference frequency within the modulation bandwidth;
and
determining and storing a plurality of delay offset entries in a delay offset LUT to correlate the plurality of calibrated frequencies with a plurality of delay factors, respectively.

Dependencies are inferred from the claim text.

Equalization filter calibration in a transceiver circuit

Life of this patent

Equalization filter calibration in a transceiver circuit

Life of this patent

Abstract

Claims18