Quadrature Signal Correction Circuit for Duty-Cycle and Phase Errors
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Solution Overview
Problem
Existing quadrature signal correction circuits fail to accurately correct duty-cycle and phase errors simultaneously, leading to increased power consumption, additional circuit area, and potential errors due to separate detectors and collision between correction circuits.
Innovation Solution
A single quadrature signal error detector and compensator simultaneously detect and correct duty-cycle and phase errors using NAND operations and error amplifiers, preventing collision and reducing circuit area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate duty cycle error correction circuit and quadrature error correction circuit are used, then correction accuracy is improved, but circuit area and power consumption increase
Solution Approach 1:
The patent combines the duty cycle error correction circuit and quadrature error correction circuit into a single integrated correction apparatus. This merging eliminates the need for separate correction circuits while maintaining correction accuracy, thereby reducing circuit area and power consumption.
Solution Approach 2:
The correction apparatus is designed to perform multiple functions simultaneously: it detects and corrects both duty cycle errors and quadrature phase errors using a unified error detection and correction mechanism. This multi-functionality allows a single circuit to replace what would traditionally require separate dedicated circuits.
2Measurement precision
If separate duty cycle error correction circuit and quadrature error correction circuit are used, then correction accuracy is improved, but power consumption increases
Solution Approach 1:
The patent merges the duty cycle error correction and quadrature error correction functions into a single integrated circuit, eliminating redundant power consumption associated with operating separate correction circuits. The unified design shares common resources such as error detectors and control logic, reducing overall power usage.
Solution Approach 2:
The correction apparatus performs both duty cycle correction and quadrature phase correction using a single multi-functional circuit, thereby reducing the total power consumption compared to running two separate dedicated correction circuits simultaneously.
3Ease of operation
If duty cycle error is corrected first and then quadrature error is corrected, then correction sequence is established, but duty cycle error may be corrupted again during quadrature error correction
Solution Approach 1:
The patent implements simultaneous error detection and correction for both duty cycle and quadrature phase errors, rather than sequential correction. By detecting both errors at the same time and correcting them together, the system avoids the problem of duty cycle error corruption that occurs during sequential correction processes.
Solution Approach 2:
The correction apparatus uses a feedback mechanism that continuously monitors both duty cycle and quadrature phase errors and adjusts the correction signals accordingly. This closed-loop feedback ensures that corrections are stable and do not corrupt previously corrected parameters.
4Measurement precision
If respective error detectors are used for duty cycle correction and phase correction, then detection accuracy is improved, but circuit area and power consumption increase
Solution Approach 1:
The patent combines the error detection functions for duty cycle and quadrature phase into a single error detector that can simultaneously detect both types of errors. This unified detection approach eliminates the need for separate error detectors, reducing circuit area while maintaining detection accuracy through multi-functional design.
Solution Approach 2:
The error detector is designed as a universal detection unit capable of detecting both duty cycle errors and quadrature phase errors using the same detection infrastructure, thereby reducing the total circuit area required compared to having separate dedicated detectors for each error type.
Data Source
AI summary
An apparatus for correcting duty-cycle and phase errors of quadrature signals, which is capable of simultaneously detecting a quadrature error and a duty cycle error of the quadrature signals at one observation point and correcting the quadrature error and the duty cycle error, and a method therefor are disclosed. The apparatus for correcting duty-cycle and phase errors of quadrature signals according to an embodiment of the present disclosure includes a quadrature signal error detector configured to detect errors of quadrature signals including an I signal, which is an in-phase signal, and a Q signal, which is a quadrature phase signal; and a quadrature signal error compensator configured to compensate for duty cycles and phases of the quadrature signals depending on the errors of the quadrature signals.