RF Switch Negative Voltage Generator With Dynamic Clock Boost
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Solution Overview
Problem
Existing RF switch negative voltage generators cannot provide a high-frequency clock while maintaining low power consumption, leading to increased current consumption and reduced performance in RF switch switching and isolation.
Innovation Solution
A low-power consumption negative voltage generator design incorporating a monostable trigger, voltage controlled oscillator, non-overlapping clock circuit, and charge pump, where the clock frequency is increased during transient states and reduced to initial levels after stabilization, optimizing power usage and switching speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a high-frequency clock is used to speed up RF switch switching, then the switching speed is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic clock frequency adjustment by using a monostable trigger to detect channel switching events and activate a voltage-controlled oscillator only during transient states. This dynamic approach allows the system to use high-frequency clocks temporarily during switching operations while maintaining low-frequency operation during stable states, thereby improving switching speed when needed while minimizing overall power consumption.
Solution Approach 2:
The patent employs periodic high-frequency clock pulses triggered only during channel switching events rather than continuous operation. The monostable trigger generates transient pulses that activate the voltage-controlled oscillator periodically only when channel switching is detected, allowing the charge pump to operate at high frequency temporarily to speed up switching while consuming minimal power during stable operation periods.
2Reliability
If a constant negative voltage generator is used to improve linearity and isolation, then the RF switch performance is improved, but the power consumption cannot be reduced
Solution Approach 1:
The patent transforms the constant negative voltage generator into a dynamic system by introducing a monostable trigger and voltage-controlled oscillator. The negative voltage is now generated dynamically based on channel switching events rather than continuously, maintaining the improved linearity and isolation performance during switching operations while significantly reducing power consumption during stable states when switching is not required.
Data Source
AI summary
Disclosed is a low-power negative voltage generator for RF switches, which is provided with a monostable trigger and a voltage-controlled oscillator before a non-overlapping clock circuit and a charge pump. The monostable trigger can change from a stable state to a transient state when a switch channel selection signal jumps; the clock frequency of the voltage controlled oscillator will be increased during the transient state of the monostable trigger, and after the monostable trigger returns to a stable state, its clock frequency will be reduced to the initial state, thereby ensuring that the circuit power consumption is reduced while the transient characteristic is high.