PWM Phase Synchronization for Wide-Range RF Impedance Matching
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Solution Overview
Problem
Conventional tunable impedance matching networks (TMNs) face limitations in achieving accurate impedance matching over wide impedance ranges, particularly in high power applications, due to the need for high bias voltages and limited tuning resolution, which can lead to impractical solutions like large numbers of digital switches for fine-tuning.
Innovation Solution
The development of phase-switched tunable impedance networks (PS-TMNs) and phase-switched impedance modulation amplifiers (PSIMs) using phase-switched variable network reactance elements, which allow for rapid, high-bandwidth, continuous impedance matching without high bias voltages, utilizing phase-shifting elements to dynamically control pulse width and phase of PWM signals for precise impedance modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If digital TMNs are implemented using CMOS switches or PIN diodes, then on-die integration and high power handling are achieved, but tuning resolution is limited and accuracy of impedance matching deteriorates
Solution Approach 1:
The patent segments the impedance matching function into multiple discrete digital reactance elements that can be individually switched. This allows fine-grained control over the total reactance value, improving tuning resolution without requiring analog components. The segmented approach enables accurate impedance matching while maintaining full digital control and on-die integration capability.
2Measurement precision
If analog TMNs are implemented using varactor diodes, then fast and accurate impedance matching is achieved, but high bias voltages are required for high power levels
Solution Approach 1:
The patent replaces the analog varactor diode mechanism (which requires high bias voltages) with a digital switching mechanism using CMOS switches or PIN diodes. This substitution eliminates the need for high bias voltages while maintaining impedance matching functionality through digital control of discrete reactance elements, reducing power consumption and simplifying bias requirements.
3Measurement precision
If the number of digital switches is increased to achieve fine-tuning resolution, then impedance matching accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts the tuning resolution function from the switching mechanism itself by using a small number of switches to select from pre-configured reactance values. This separation allows high tuning resolution to be achieved without proportionally increasing the number of switches, as the resolution is determined by the granularity of the discrete reactance elements rather than the number of switching components.
Data Source
AI summary
Described are concepts, systems, circuits and techniques directed toward methods and apparatus for generating one or more pulse width modulated (PWM) waveforms with the ability to dynamically control pulse width and phase with respect to a reference signal.