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US 9,634,877 B2Granted
Trim for dual-port frequency modulation
AssigneeSunrise Micro Devices, Inc.
InventorsMario Lafuente, Paul Edward Gorday
Life of this patent
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Abstract
Various methods provide for trimming the gain in a dual-port phase-locked loop (PLL) of a radio transceiver. Use is made of the radio's demodulator to perform modulation accuracy measurements, thereby reducing the cost and complexity of external test equipment.
Claims12
A method for trimming analog gain of a transceiver of a radio, comprising:
- modulating a signal generated by a phase-locked loop of the transceiver in accordance with a test data pattern to generate a modulated signal, where the test data pattern is automatically generated by an automatic data generation function or a processor of a dual-port frequency modulation (FM) modulator of the transceiver;
- generating by the transceiver a modulated intermediate frequency signal from a radio frequency (RF) signal and the modulated signal;
- processing the modulated intermediate frequency signal by a demodulator of the transceiver to determine modulation accuracy of the modulated intermediate frequency signal;
- monitoring the determined modulation accuracy of the modulated intermediate frequency signal and responsive to the determined modulation accuracy falling outside an acceptable range of modulation accuracy, adjusting the analog gain value of the transceiver to bring the modulation accuracy of the modulated intermediate frequency signal within the acceptable range of modulation accuracy;
- and
- further comprising responsive to the dual-port frequency modulation (FM) modulator receiving a data configure signal to select the test data pattern automatically generated by the automatic data generation function and to not select a data pattern provided to the dual-port frequency modulation (FM) modulator:
- the automatic data generation function providing to a pulse shape filter of the dual-port frequency modulation (FM) modulator the automatically generated test data pattern;
- the pulse shape filter shaping the received automatically generated test data pattern;
- and
- providing the pulse-shaped automatically generated test data pattern to the phase-locked loop.
7 more elements
A method for trimming analog gain of a transceiver of a radio, comprising:
- modulating a signal generated by a phase-locked loop of the transceiver to generate a modulated signal;
- generating by the transceiver a modulated intermediate frequency signal from an RF signal and the modulated signal;
- processing the modulated intermediate frequency signal by a demodulator of the transceiver to determine modulation accuracy of the modulated intermediate frequency signal;
- monitoring the determined modulation accuracy of the modulated intermediate frequency signal and responsive to the determined modulation accuracy falling outside an acceptable range of modulation accuracy, adjusting the analog gain value of the transceiver to bring the modulation accuracy of the modulated intermediate frequency signal within the acceptable range of modulation accuracy;
- receiving at a radio frequency (RF) input of the transceiver an un-modulated carrier and producing from the un-modulated carrier the radio frequency (RF) signal;
- mixing the radio frequency (RF) signal and the modulated signal to produce a modulated analog signal;
- and
- processing the modulated analog signal to generate the modulated intermediate frequency signal, where processing the modulated analog signal further comprises:
- amplifying and filtering the modulated analog signal to generate an amplified, filtered analog signal;
- and
- converting the amplified, filtered analog signal from analog to digital to generate the modulated intermediate frequency signal.
8 more elements
Dependencies are inferred from the claim text.