RF Switch Bias Control Link With Boost-to-Normal Charge Pumping
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Solution Overview
Problem
Existing radio-frequency switch control links in communication systems suffer from poor performance and are slow to generate bias voltages.
Innovation Solution
A radio-frequency switch control link with a bias voltage generation module that includes a first oscillator and charge pump, capable of switching between high and low frequencies and capacitance values to quickly generate bias voltages in boost and normal modes, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing radio-frequency switch control links are used, then the system is simple, but the bias voltage generation speed is slow and performance is poor
Solution Approach 1:
The patent implements dynamic switching between boost mode and normal mode in the control link. The edge detection module detects signal edges and dynamically switches the charge pump between boost mode (for fast bias voltage generation) and normal mode (for steady-state operation), making the system adaptive to different operational requirements and resolving the contradiction between speed and complexity
Solution Approach 2:
The control link is segmented into distinct functional modules: edge detection module, charge pump with dual modes, and mode switching logic. This segmentation allows each module to be optimized independently - the edge detection module handles speed-critical edge detection, while the charge pump handles voltage generation, resolving the contradiction by distributing complexity across specialized segments
2Speed
If boost mode is used for fast bias voltage generation, then the generation speed is fast, but the driving capability may be insufficient without high capacitance
Solution Approach 1:
The charge pump dynamically switches between boost mode (high frequency, fast generation) and normal mode with adjusted capacitance values (driving capability optimization). The system transitions from boost mode for rapid voltage establishment to normal mode for sustained high-driving capability operation, resolving the contradiction between speed and power
Solution Approach 2:
The patent changes operational parameters (frequency and capacitance) of the charge pump based on mode. In boost mode, high frequency enables fast generation; in normal mode, adjusted capacitance values optimize driving capability. This parameter adaptation resolves the contradiction by matching parameters to operational requirements
3Speed
If high frequency operation is used, then the bias voltage generation is fast, but spurs increase and performance degrades
Solution Approach 1:
The patent uses periodic switching between boost mode (high frequency, fast generation) and normal mode (lower frequency, cleaner operation). The edge detection module triggers brief high-frequency bursts for fast response, then transitions to normal mode for cleaner sustained operation, reducing spurs while maintaining fast response capability
Solution Approach 2:
The system dynamically adjusts operating frequency based on operational phase: high frequency during boost mode for fast generation, then transitions to normal mode with adjusted frequency to reduce spurs. This dynamic frequency adaptation resolves the contradiction between speed and harmful emissions
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 enables rapid generation of bias voltages with high driving capability in boost mode and stable operation with reduced spurs in normal mode, enhancing the performance of radio-frequency switch control links.
Implementation Method 1
a bias voltage generation module, which comprises a first oscillator and at least one stage of a charge pump, wherein the charge pump and the first oscillator are both connected to an output end of the edge detection module
Implementation Method 2
the pump capacitor unit is configured to have a first capacitance value in response to the boost-mode signal, and have a second capacitance value in response to the normal-mode signal
Implementation Method 3
the first oscillator is configured to output a first frequency in response to the boost-mode signal, and output a second frequency in response to the normal-mode signal
Data Source
AI summary
A radio-frequency switch control link includes: an edge detection module, configured to output a boost-mode signal in response to a boost control signal and output a normal-mode signal in response to a normal control signal; and a bias voltage generation module, which includes a first oscillator and a charge pump. The first oscillator is configured to output a first frequency in response to the boost-mode signal and output a second frequency in response to the normal-mode signal, wherein the first frequency is greater than the second frequency. A pump capacitor unit in the charge pump is configured to have a first capacitance value in response to the boost-mode signal, and have a second capacitance value in response to the normal-mode signal, wherein the first capacitance value is greater than the second capacitance value.