A method and system for on-chip transmitter wide temperature range amam and ampm distortion measurement

By generating a stepped signal in the on-chip transmitter and combining it with a temperature sensor and a programmable resistor network, the problem of AMAM and AMPM distortion measurement over a wide temperature range is solved, achieving accurate distortion data acquisition and temperature adaptive compensation, thus improving the linearity and quality of the communication system.

CN122449331APending Publication Date: 2026-07-24AIC SEMICON LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
AIC SEMICON LTD
Filing Date
2026-06-25
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies cannot accurately measure AMAM and AMPM distortion of on-chip transmitters over a wide temperature range, resulting in poor pre-distortion compensation and difficulty in guaranteeing communication quality.

Method used

A stepped signal is generated using digital circuitry. AMAM and AMPM distortion data are acquired through a transmit and feedback link and measured at multiple temperature points. The power amplifier temperature is monitored and controlled in real time using temperature sensors and a programmable resistor network. A temperature-adaptive digital predistortion lookup table is generated for compensation.

Benefits of technology

It enables rapid and accurate measurements over a wide temperature range, provides comprehensive distortion profiles, and significantly improves transmitter linearity and communication quality.

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Abstract

The application discloses a kind of on-chip transmitter wide temperature range AMAM and AMPM distortion measurement method and system.The method comprises: digital circuit generates the ladder signal containing multiple amplitude steps as test excitation;Signal is amplified after being transmitted link, and is coupled from power amplifier output end Feedback back to digital circuit;By analyzing the amplitude and phase relationship of input and feedback signal, calculate AMAM and AMPM distortion;While integrating resistance controllable resistance network and temperature sensor near power amplifier, achieve the purpose of accurately controlling chip temperature and real-time monitoring temperature;When temperature reaches multiple preset points, the above measurement process is triggered respectively, so as to obtain the distortion characteristics of transmitter in wide temperature range.The application can quickly and accurately obtain the AMAM and AMPM distortion data of on-chip transmitter under wide working temperature, provide basis for temperature adaptive digital pre-distortion, significantly improve the linearity and reliability of communication system.
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