RF Power Supply Pulse Conversion With Single-Line Level Control
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Solution Overview
Problem
Conventional high-frequency power supplies experience jitter, overshoot, and undershoot in RF pulse signals due to parasitic capacitances and the need for separate control lines for pulse conversion and output level control, leading to increased components and potential time lags.
Innovation Solution
A high-frequency power supply that integrates pulse conversion and output level control into a single pulse conversion/variable gain amplification unit, utilizing a single control line to transmit control signals, thereby eliminating the need for separate modulation and level adjustment units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate modulation unit and level adjustment unit are used for pulse conversion and output level control, then functional completeness is achieved, but device complexity increases and time lags occur between control operations
Solution Approach 1:
The patent combines the modulation unit and level adjustment unit into a single integrated unit that performs both pulse conversion and output level control functions. This merging eliminates the need for separate control lines and reduces the number of components while maintaining full functional capability through a unified control mechanism
Solution Approach 2:
The integrated unit is designed to perform multiple functions simultaneously - both pulse conversion and output level control - through a single control line. This multi-functional design reduces device complexity while preserving adaptability by handling diverse control operations within one unified structure
2Speed
If DC bias circuit is switched at high speed for pulse conversion, then response speed is improved, but parasitic capacitances cause transient phenomena leading to jitter and overshoot/undershoot
Solution Approach 1:
The patent applies preliminary anti-action by using a sloping waveform in the control signal to counteract the adverse effects of parasitic capacitances before they can cause significant distortion. The gradual slope of the control signal prevents abrupt transitions that would otherwise excite parasitic resonances and cause jitter or overshoot, thereby maintaining signal stability while still achieving responsive pulse conversion
Data Source
AI summary
A high-frequency power supply (10) uses one pulse conversion/variable gain amplification unit (23) to perform two processing steps which are converting an RF signal into pulses and controlling an output level, and uses one control signal (27) to perform the pulse conversion and the output level control by the pulse conversion/variable gain amplification unit (23), thereby obviating the need for a modulation unit, which is a factor in the generation of jitter, overshoot, and undershoot, and reducing the number of control lines (29) for sending the control signal (27) to one control line. Due to this configuration, the jitter, overshoot, and undershoot generated in an RF pulse signal can be prevented, and the RF-signal pulse conversion and output level control are performed simultaneously using one control line (29).