RF Switch Bias Voltage Generation from Control Signals
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Solution Overview
Problem
Silicon-based RF switches require special biasing circuitry and voltages for high power operations, which increases costs and complexity, unlike pHEMT devices that can operate without auxiliary biasing due to their leakage current characteristics.
Innovation Solution
A voltage generating unit within the RF switch that uses control signals to derive power voltages for inverting circuits, allowing the RF switch to operate in high power scenarios without external biasing, by employing silicon-based transistors and internal voltage generation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silicon-based transistors are used in RF switches, then cost and manufacturing complexity are reduced, but external biasing voltages are required for high power operations
Solution Approach 1:
The patent combines the voltage generation function with the control signal input by deriving power voltages from control signals through internal voltage drop circuits. This merging eliminates the need for separate external biasing circuitry while maintaining high power operation capability with silicon-based transistors.
Solution Approach 2:
The RF switch generates its own power voltages internally using control signals as input, eliminating dependence on external biasing sources. The control signals serve dual purposes: controlling switch operation and providing power for high power scenarios through internal voltage generation.
2Reliability
If external biasing voltages are provided for high power operation, then RF switch performance is maintained, but additional pins and external power sources are required
Solution Approach 1:
The control signals are given multiple functions: they control the switching operation and simultaneously serve as the source for generating power voltages needed for high power operation. This multi-functionality reduces the number of required pins and external connections.
Solution Approach 2:
Voltage drop circuits act as intermediaries that convert control signals into the necessary power voltages for high power operation. These intermediary circuits enable the transfer of energy from control signals to the RF switch components without requiring direct external biasing connections.
3Device complexity
If pHEMT devices are used, then auxiliary biasing is not needed due to leakage current characteristics, but device cost and integration complexity increase
Solution Approach 1:
The patent changes the operating parameters of silicon-based transistors by providing dynamically generated power voltages that adapt to control signal levels. This enables silicon devices to achieve high power operation without requiring the special leakage current characteristics of pHEMT devices, making them easier to manufacture and integrate.
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
Enables silicon-based RF switches to operate effectively in high power scenarios without external biasing voltages, simplifying design and reducing costs by generating necessary voltages from control signals, thus eliminating the need for additional pins and external power sources.
Implementation Method 1
The first and second inputs are coupled to the first output through respective first and second voltage drop circuits, and a first power voltage and a second power voltage based on the first and second control signals are derived from the first output
Data Source
AI summary
An power voltage generating unit for a radio frequency switch includes a first input and a second input respectively configured to receive a first control signal and a second control signal, wherein the first control signal and the second control signal are configured to control which one of a plurality of paths in the radio frequency switch is enabled, and at least one output, configured to output an auxiliary voltage, derived from at least one of the first control signal or the second control signal, that is used to operate the radio frequency switch. The power voltage may be a voltage used to power an inverting circuit used to enable a selected branch as an isolation branch or shunt branch.