Residual Sideband Calibration via Interleaved Oscillator Mixing
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Solution Overview
Problem
Modern wireless communication devices face challenges in achieving accurate and flexible residual sideband (RSB) calibration due to local oscillator and signal path mismatches, which degrade the signal-to-noise ratio (SNR) and are inflexible in different calibration circumstances.
Innovation Solution
An integrated circuit (IC) with multiple oscillator systems and signal paths, including a mixer and a tone generator, generates oscillating signals and tone signals for RSB calibration, allowing for improved calibration accuracy and flexibility through time or frequency interleaved calibration modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard RSB calibration methods are used, then calibration can be performed, but calibration accuracy is insufficient and flexibility is limited
Solution Approach 1:
The patent implements dynamic calibration by allowing the system to switch between time-interleaved and frequency-interleaved calibration modes based on operational requirements. The calibration process is made adaptive through dynamic selection of calibration signals and interleaving strategies, enabling the system to optimize between accuracy and flexibility depending on the specific scenario.
Solution Approach 2:
The patent changes calibration parameters by introducing multiple oscillator systems with different frequencies and implementing variable interleaving factors. The system can adjust calibration frequencies, time intervals, and signal characteristics to achieve optimal calibration accuracy while maintaining flexibility across different operating conditions.
2Measurement precision
If multiple oscillator systems are used for calibration, then calibration accuracy and flexibility improve, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing oscillator systems that serve dual purposes: primary oscillators for normal operation and secondary oscillators for calibration. The same mixer and signal path infrastructure is used for both calibration and operational modes, reducing overall system complexity while enabling accurate RSB calibration through multiple frequency sources.
Solution Approach 2:
The patent introduces intermediate calibration signals generated by secondary oscillators that mediate between the primary oscillators and the mixing process. These intermediary signals enable precise measurement and calibration of I/Q mismatches without requiring complete system redesign, thus improving accuracy while managing complexity.
3Adaptability or versatility
If traditional calibration approaches are used, then the process is simple, but it is inflexible in different calibration circumstances
Solution Approach 1:
The patent implements dynamic calibration by allowing the system to switch between time-interleaved and frequency-interleaved calibration modes based on operational requirements. The calibration process is made adaptive through dynamic selection of calibration signals and interleaving strategies, enabling the system to optimize between accuracy and flexibility depending on the specific scenario.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces spur tones and electromagnetic coupling, enhancing RSB calibration accuracy and efficiency while allowing for simultaneous calibration of multiple receiver chains, thereby improving the overall performance of wireless communication devices.
Implementation Method 1
the mixer of the first one of the plurality of signal paths coupled to the tone generator of the another one of the plurality of signal paths and configured to generate a mixed signal for RSB calibration based on the tone signal from the tone generator of the another one of the plurality of signal paths and the oscillating signal from the oscillator system coupled to the first one of the plurality of signal paths
Data Source
AI summary
Aspects of the present disclosure provide an integrated circuit (IC). The IC comprises oscillator systems each configured to generate a respective oscillating signal. The IC comprises signal paths each coupled to a respective one of the plurality of oscillator systems, a first one of the plurality of signal paths comprises a mixer, and another one comprises a tone generator. The tone generator is configured to generate a tone signal based on the oscillating signal from the corresponding oscillator system. The mixer is coupled to the tone generator of said another one of said plurality of signal paths and is configured to generate a mixed signal for RSB calibration based on the tone signal from the tone generator of said another one of the plurality of signal paths and the oscillating signal from the oscillator system coupled to said first one of said plurality of signal paths.