Modulated Wideband Converter Calibration Using Multitone Signals
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Solution Overview
Problem
Current calibration methods for modulated wideband converters are inefficient due to reliance on single tone calibration signals, which are time-consuming and prone to phase shift errors, making precise parameter calibration challenging.
Innovation Solution
A calibration device and method using a multitone signal with tones in multiple frequency bands, centered at integer multiples of the repetition frequency, to calibrate the converter's parameters by shifting initial phases and maintaining maximum amplitude within rated ranges, allowing for precise frequency component detection and reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single tone calibration signals are used, then the calibration process is simple to implement, but the calibration time is excessive and phase shift errors occur
Solution Approach 1:
The patent combines multiple single-tone calibration signals into a single multitone calibration signal that contains multiple frequency components. This merging approach allows simultaneous calibration of multiple parameters in one operation, dramatically reducing calibration time while maintaining implementation simplicity through unified signal generation and processing
2Ease of manufacture
If single tone calibration signals are used, then the signal generation is simple, but phase shift errors and random jitter influence calibration precision
Solution Approach 1:
The patent segments the calibration process by using a multitone signal with distinct frequency components, where each tone can be independently analyzed. This segmentation allows precise measurement of phase shifts and jitter effects for each frequency component separately, improving overall calibration precision while keeping signal generation manageable through standard multitone synthesis techniques
3Measurement precision
If multitone signal with multiple frequency bands is used, then frequency component detection precision is improved, but signal processing complexity increases
Solution Approach 1:
The patent employs periodic signal patterns in the multitone calibration signal, where each frequency component repeats at known intervals. This periodic structure enables efficient detection and separation of frequency components using correlation techniques and Fourier analysis, achieving high detection precision while managing processing complexity through exploitation of signal periodicity
Data Source
AI summary
There is provided a calibration device including: a calibration signal supply unit configured to supply, as a calibration input signal, a multitone signal having tones in a plurality of frequency bands to a converter configured to multiply an input signal by each of a plurality of signal patterns and limit a band to obtain each of a plurality of bandpass signals, and reconstruct an output signal in accordance with an input signal from the plurality of bandpass signals; a calibration bandpass signal acquisition unit configured to acquire a plurality of calibration bandpass signals obtained by the converter in response to the multitone signal; and a calibration processing unit configured to calibrate a parameter for the reconstruction in the converter based on the plurality of calibration bandpass signals.