RF Switch Gate Bootstrapping for High-Voltage Leakage Control
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Solution Overview
Problem
High voltage radio-frequency (RF) switches face challenges in handling voltages exceeding 80 V peak in cellular user equipment and 100 V in cellular base station equipment, with existing solutions compromising performance due to leakage currents and limited voltage handling capabilities.
Innovation Solution
The implementation of a radio-frequency switch device with a compensation network to manage leakage currents and a bootstrapping network that establishes low impedance paths during OFF mode and high impedance paths during ON mode, enhancing voltage handling capabilities by optimizing biasing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high voltage handling capability is improved by using stacked MOSFET devices, then voltage handling reaches values exceeding 100 V, but leakage currents increase and compromise performance
Solution Approach 1:
A compensation network is introduced as an intermediary between the body terminal of the first transistor and the second source/drain terminal. This network includes a compensation transistor that actively counteracts leakage currents by providing a compensating current flow, thereby eliminating the harmful effect of leakage without reducing the high voltage handling capability of the stacked MOSFET structure.
Solution Approach 2:
The compensation network operates with feedback mechanisms where the compensation transistor is biased to detect and counteract leakage currents in real-time. The biasing arrangements ensure that the compensation transistor adjusts its operation based on the leakage conditions, maintaining optimal performance across varying voltage levels while preserving the high voltage handling capability.
2Strength
If voltage handling capability is improved to exceed 100 V, then high voltage applications are enabled, but device performance is compromised due to leakage
Solution Approach 1:
The compensation network acts as an intermediary system that isolates the main switch transistors from the harmful effects of leakage currents. By introducing the compensation transistor and associated biasing networks, the system maintains reliable device performance at high voltages exceeding 100 V without the performance degradation that would otherwise occur due to leakage.
Solution Approach 2:
The invention changes the electrical parameters of the system by introducing adjustable biasing voltages and currents through the compensation network. The biasing arrangements allow dynamic adjustment of the compensation transistor's operating point, enabling the device to maintain optimal performance across a wide range of high voltage conditions while suppressing leakage effects.
3Reliability
If leakage compensation is implemented, then performance at high voltages is maintained, but device complexity increases
Solution Approach 1:
The compensation function is segmented into distinct functional blocks: the compensation transistor, the biasing networks, and the connection topology. This segmentation allows each component to be optimized independently and facilitates modular design, making the complex leakage compensation function manageable and implementable without overwhelming system complexity.
Solution Approach 2:
The compensation network is designed with multi-functionality to reduce overall device complexity. The same compensation transistor and biasing arrangements serve multiple purposes: suppressing leakage currents, maintaining performance consistency, and enabling high voltage operation. This universal approach eliminates the need for separate circuits for each function, thereby reducing the net increase in device complexity.
Data Source
AI summary
A radio frequency switch device includes a first transistor and a second transistor; a compensation network coupled between a body terminal of the first transistor and a source/drain terminal of the second transistor; and a bootstrapping network having a first terminal coupled to a first bias terminal, a second terminal coupled to a gate terminal of the first transistor, and a third terminal coupled to the body terminal of the first transistor, wherein the bootstrapping network establishes a low impedance path between the gate terminal and the body terminal of the first transistor in response to a first voltage value of the first bias terminal, and wherein the bootstrapping network establishes a high impedance path between the gate terminal and the body terminal of the first transistor in response to a second voltage value of the first bias terminal.