RF Switch Controller Sleep-Mode Regulator With Common Enable
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Solution Overview
Problem
Radio-frequency switch controllers face challenges in managing power consumption and leakage current, particularly when operating over a wide voltage range without an external power down pin, which affects their efficiency and reliability in applications like wireless communication devices.
Innovation Solution
A controller architecture that includes a low-dropout regulator and a mode detector, allowing the regulator to generate reference voltage levels or enter a sleep mode based on a common input signal, with a low power bandgap circuit and error amplifier to minimize leakage current and conserve power, while eliminating the need for a dedicated power down pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a dedicated power down pin is added to the regulator, then power management capability is improved, but device complexity and pin count increase
Solution Approach 1:
The enable pin is designed to perform multiple functions: it can activate the regulator for normal operation, put the regulator into sleep mode for power conservation, and serve as a general enable/disable control. This multi-functionality eliminates the need for a separate dedicated power down pin while maintaining full power management capability.
2Reliability
If the regulator operates continuously to maintain voltage levels, then voltage regulation is ensured, but power consumption increases
Solution Approach 1:
The regulator's operational state is made dynamic rather than static. The regulator can switch between active mode (when voltage regulation is needed) and sleep mode (when power conservation is prioritized). The enable pin controls this dynamic state change, allowing the system to adapt its power consumption based on operational requirements.
3Use of energy by moving object
If the regulator enters sleep mode to conserve power, then power consumption is reduced, but voltage regulation capability is lost
Solution Approach 1:
The system prepares for voltage regulation needs by using the enable pin to pre-activate the regulator before power consumption becomes critical. The enable pin serves as an early warning signal that allows the regulator to transition from sleep mode to active mode in advance, ensuring voltage regulation capability is restored before it is actually needed.
Data Source
AI summary
Circuits and devices related to switch controller. In some embodiments, a radio-frequency module can include a packaging substrate configured to receive a plurality of components, and a switching circuit implemented on the packaging substrate. The radio-frequency module can further include a control circuit configured to control operation of the switching circuit. The control circuit can include a regulator configured to generate a plurality of reference voltage levels for the operation of the switching circuit, or to be in a sleep mode, based on a control signal received through a common input node. The control circuit can further include a mode detector in communication with the regulator and configured to provide a first form of the control signal to the common input node to allow the plurality of reference levels to be generated by the regulator, or a second form of the control signal to the common input node to put the regulator in the sleep mode.