Local Oscillator Duty Ratio Tuning for Multi-Distortion Calibration
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Solution Overview
Problem
In cellular transmitter designs, multiple calibration processes are required to correct impairments like image distortion, counter-intermodulation distortion, and harmonics distortion, which are time-consuming and costly, especially due to the need for precise measurement receivers.
Innovation Solution
The method involves setting a local oscillator duty ratio based on measured image distortion levels, allowing for a single calibration measurement that corrects multiple impairments, reducing circuit complexity and time, and potentially lowering costs by avoiding complex circuit designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple calibration processes are performed to correct various impairments, then distortion correction accuracy is improved, but calibration time and manufacturing cost increase
Solution Approach 1:
The patent combines multiple calibration processes into a single calibration procedure by measuring image distortion level as a proxy indicator that correlates with multiple types of distortions (image distortion, counter-intermodulation distortion, harmonics distortion). By adjusting the local oscillator duty ratio based on this single measurement, the system simultaneously corrects multiple impairments that would otherwise require separate calibration steps, thereby reducing calibration time while maintaining comprehensive distortion correction.
Solution Approach 2:
The patent makes the image distortion measurement serve multiple calibration functions. The measured image distortion level is used to determine duty ratio adjustments that correct not only image distortion but also counter-intermodulation distortion and harmonics distortion. This multi-functional approach allows a single calibration measurement to address multiple impairment types, reducing the number of separate calibration processes needed.
2Measurement precision
If precise measurement receiver is designed to measure very low levels of distortions, then measurement precision is improved, but circuit complexity and cost increase
Solution Approach 1:
The patent introduces image distortion level as an intermediary measurement that serves as a proxy for multiple distortion types. Instead of directly measuring very low levels of counter-intermodulation distortion or harmonics distortion which would require high-precision complex receivers, the system measures image distortion level which is easier to detect and correlates with the other distortion types. This intermediary measurement simplifies the receiver design while still enabling comprehensive distortion correction.
Solution Approach 2:
The patent uses a simpler, less expensive measurement approach by relying on image distortion measurement rather than requiring high-precision receivers capable of measuring very low-level distortions. The image distortion measurement serves as a sufficient proxy that allows the use of less complex circuitry, reducing manufacturing cost while maintaining effective calibration capability.
3Manufacturing precision
If multiple calibration processes are performed, then comprehensive distortion correction is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple calibration processes into a single cost-effective procedure. By using image distortion level measurement to drive duty ratio adjustments that correct multiple distortion types simultaneously, the system eliminates the need for multiple separate calibration processes, reducing manufacturing cost while maintaining comprehensive distortion correction capability.
Solution Approach 2:
The patent creates a universal calibration approach where a single image distortion measurement and subsequent duty ratio adjustment process serves multiple correction functions. This multi-functional calibration method addresses image distortion, counter-intermodulation distortion, and harmonics distortion through one unified process, reducing the complexity and cost of manufacturing compared to implementing multiple separate calibration processes.
Data Source
AI summary
An apparatus and method are provided for setting a local oscillator duty ratio based on an image distortion level. A first signal is transmitted utilizing a first X-phase path of a transmitter. Further, an image distortion level is measured in connection with the first signal. Based on the measurement, a duty ratio of a local oscillator is set, for reducing a distortion in connection with a transmission of a second signal utilizing a second Y-phase path of the transmitter.