DC Offset Calibration in Wireless Signal Receivers
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Solution Overview
Problem
In wireless communication systems, the inconsistency of DC biases leads to the DC offset phenomenon, which affects signal integrity and limits the dynamic range of receivers, necessitating an efficient calibration method.
Innovation Solution
A signal receiving apparatus and method that utilize an adjustment circuit and calculation circuits to adjust and calibrate DC signals by generating error signals and change rates, enabling quick convergence of DC offset compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC offset calibration is implemented in wireless receiver, then signal integrity and dynamic range are improved, but device complexity increases
Solution Approach 1:
The DC offset calibration function is segmented into independent calculation circuits (first calculation circuit for error signal generation, second calculation circuit for change rate calculation) that can be separately implemented and optimized. This modular approach allows DC calibration to be added without requiring complete system redesign, thus improving signal integrity while controlling the increase in device complexity through targeted, localized circuit additions.
2Speed
If traditional DC offset calibration methods are used, then device complexity is kept low, but convergence speed is slow
Solution Approach 1:
The calibration system performs preliminary actions by pre-calculating error signals and change rates through dedicated calculation circuits before final DC offset compensation is applied. The first calculation circuit generates error signals based on target DC levels, and the second calculation circuit pre-computes change rates, enabling faster convergence when actual calibration is needed without requiring complex real-time computation during signal reception.
3Productivity
If DC offset calibration is implemented, then dynamic range is improved, but loss of time for calibration increases
Solution Approach 1:
The DC offset calibration system maintains continuous useful action through parallel operation of multiple calculation circuits that continuously monitor and adjust DC levels. The first and second calculation circuits operate simultaneously to generate error signals and compute change rates, enabling continuous calibration without interrupting the main signal reception process, thus improving dynamic range while minimizing calibration time loss.
Data Source
AI summary
A signal receiving apparatus, applicable in a wireless system calibrating direct current offset, includes: an adjusting circuit arranged to receive an receiving signal having a first DC (Direct Current) signal, and adjust the first DC signal to generate the receiving signal having a second DC signal according to an adjusting signal; a first arithmetic circuit arranged to generate an error signal according to the second DC signal and a target DC signal; and a second arithmetic circuit arranged to calculate an error signal slope according to the error signal, and update the adjusting signal according to the error signal slope and the error signal.