Calibration of an adaptive signal conditioning system

Abstract

The invention provides robust and non-invasive calibration of an adaptive signal conditioning system having a signal conditioning block in the signal path to a signal conversion system, and a feedback path with a number of feedback components for enabling adaptation, by means of a parameter adaptation block, of the parameters used in the signal conditioning. In order to calibrate the feedback path, a well-defined reference signal is inserted into the feedback path, and an appropriate calibration coefficient is then determined by a coefficient calibrator in response to the received reference signal. The calibration coefficient is provided to a compensator, which effectively compensates for changes in the transfer characteristics of the feedback path due to factors such as variations in ambient temperature and component aging. Accordingly, the feedback signal transferred over the calibrated feedback path will be an accurate representation of the output signal of the signal conversion system, thus allowing accurate adaptive signal conditioning.

Description

technical field [0001] The present invention generally relates to an adaptive signal conditioning system and methods of calibrating such a system, as well as schemes for implementing adaptive signal conditioning techniques in power amplifier systems and multiband transmitter systems. Background technique [0002] Adaptive signal conditioning systems are found in all fields of electronics and communications, and are typically used to condition an input signal to a signal conversion system such as an amplifier chain or any other suitable system. Adaptive regulation to continuously provide the desired output signal for the entire system. [0003] Predistortion Distortion is a signal conditioning technique. For example in power amplifier and transmitter systems, as shown in references 1-9. The main purpose of predistortion is to compensate for the distortion caused by a power amplifier or similar system by pre-distorting the input signal to the power amplifier, taking advantag...

AI Technical Summary

Problems solved by technology

However, power detectors must also be calibrated for all known variables of interest such as power, temperature, and frequency

Although the power detector compensation is relatively small compared to the complete transmission path, it shows that this compensation still suffers from the same disadvantages as the previously described compensation, including aging uncertainty and the need for time

Images