Ip2 calibration methods and techniques

Abstract

Some embodiments of the present disclosure relate to improved techniques for performing IP2 calibration in receivers having two complementary data paths (e.g., i-data path and q-data path). In these techniques, one of the two data paths (e.g., the i-data path) is used to generate a reference signal for the other data path (e.g., the q-data path), and / or vice versa. The other data path then performs calibration using the reference signal. Compared to previous techniques (which required separate, dedicated circuitry for generating a reference signal), the inventive techniques reduce the amount of circuitry and correspondingly reduce the manufacturing costs and power consumption. This is because the inventive techniques use the existing circuitry in complementary fashion during calibration (e.g., during calibration an i-data path generates a reference signal for a q-data path, and vice versa).

Description

Technical field [0001] The present disclosure relates to wireless communication transceivers, and particularly to linearity improvement techniques for receiving high-quality signals in the presence of strong interference signals. Background technique [0002] Among the various linearity requirements, it is expected that the receiver will have a high second-order intermodulation intercept point (IP2), which represents the second-order nonlinearity responsible for the generation of second-order intermodulation distortion (IMD2). Compensation or calibration techniques can be used to improve the IP2 characteristics of the receiver. Although calibration technology has certain advantages over compensation technology, until now, it has been difficult to provide the best control signal (such as tuning code) in a cost-effective and power-efficient manner. This is largely because the previous implementation has required a separate dedicated circuit in order to generate the reference signa...

AI Technical Summary

Problems solved by technology

While calibration techniques have some advantages over compensation techniques, until now it has been difficult to provide optimal control signals (such as tuning codes) in a cost-effective and power-efficient manner

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