High-Frequency Switching Circuit Dynamic Substrate Bias Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-frequency switches face challenges in achieving a balance between low intermodulation distortions and low current consumption, particularly in mobile phone applications where different data rate requirements demand varying trade-offs between these parameters.
Innovation Solution
A high-frequency switching circuit that selectively applies two different bias potentials to the substrate of high-frequency switching transistors based on a control signal, allowing for improved intermodulation characteristics while minimizing current consumption by adjusting the substrate bias voltage according to the operational mode of the mobile phone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a high-frequency switch uses a fixed substrate bias potential, then the circuit structure is simple, but it cannot achieve a better trade-off between intermodulation characteristics and current consumption
Solution Approach 1:
The substrate bias potential is changed from a fixed value to a dynamically switchable parameter. The control circuit selectively applies different bias potentials (first bias potential and second bias potential) to the substrate based on the operating mode, enabling the high-frequency switch to adapt its characteristics dynamically between UMTS mode (prioritizing intermodulation performance) and GSM mode (prioritizing current consumption reduction).
Solution Approach 2:
The invention changes the substrate bias potential parameter between two distinct values depending on the operating mode. By switching the bias potential from a first value (optimized for intermodulation characteristics in UMTS mode) to a second value (optimized for current consumption in GSM mode), the system achieves adaptive performance without requiring complex circuit restructuring.
2Reliability
If a high-frequency switch applies a bias potential optimized for low intermodulation distortions, then intermodulation characteristics are improved, but current consumption increases
Solution Approach 1:
The substrate bias potential is dynamically adjusted based on the operating mode requirements. In UMTS mode, the first bias potential is applied to achieve low intermodulation distortions. In GSM mode, the second bias potential is applied to reduce current consumption. This dynamic switching allows the system to optimize for reliability when needed and for energy efficiency when needed.
Solution Approach 2:
The bias potential is switched periodically or conditionally between two states based on the operating mode (UMTS or GSM). The control circuit activates the appropriate bias potential configuration for each mode, enabling periodic optimization between intermodulation performance and current consumption based on system requirements.
3Duration of action of moving object
If a high-frequency switch applies a bias potential optimized for low current consumption, then standby time is extended, but intermodulation characteristics deteriorate
Solution Approach 1:
The substrate bias potential is dynamically switched between two configurations based on the operating mode. When the mobile phone operates in GSM mode, the second bias potential is applied to extend standby time by reducing current consumption. When UMTS mode is activated, the first bias potential is applied to ensure good intermodulation characteristics. This dynamic adaptation allows the system to prioritize standby time when needed and reliability when needed.
Data Source
AI summary
A high-frequency switching circuit includes a high-frequency switching transistor, wherein a high-frequency signal-path extends via a channel-path of the high-frequency switching transistor. The high-frequency switching circuit includes a control circuit and the control circuit is configured to apply at least two different bias potentials to a substrate of the high-frequency switching transistor, depending on a control signal received by the control circuit.