Decode Switch Charge Sharing for Faster Low-Power Setup
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Solution Overview
Problem
Conventional decode switches face inefficiencies in power consumption and setup time due to the need to charge multiple capacitances sequentially, leading to slow setup speed and wastage of electric charges.
Innovation Solution
Implementing charge sharing between source and target capacitances, where the source capacitance is charged to a first voltage and then connected to the target capacitance to charge it to a second voltage, reducing power consumption and shortening setup time by allowing partial charge transfer and discharge optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power source charges multiple capacitances sequentially through conventional decode paths, then the voltage assertion is achieved, but the setup time becomes slow
Solution Approach 1:
The source capacitance is pre-charged to the first voltage before the switching operation. This preliminary charging action allows the source capacitance to immediately share charge with the target capacitance when connected, eliminating the need for the power source to charge the target capacitance from zero, thereby significantly reducing setup time
Solution Approach 2:
The source capacitance acts as an intermediary energy storage element between the power source and the target capacitance. Instead of the power source directly charging the target capacitance, the pre-charged source capacitance serves as a mediator that transfers charge to the target, enabling faster voltage assertion
2Loss of time
If the power source charges multiple capacitances simultaneously, then the setup time is reduced, but the power consumption increases
Solution Approach 1:
The source capacitance serves itself by being reused across multiple decode paths. After discharging to a target capacitance, it is recharged by the power source and then shares charge with the next target capacitance. This self-service mechanism allows the same capacitance to serve multiple purposes, reducing overall power consumption compared to charging each target capacitance independently from the power source
3Ease of operation
If the conventional decode switch discharges capacitances to reference voltage, then the switching is completed, but the power consumption increases due to charge squandering
Solution Approach 1:
Instead of discarding the charge in the source capacitance to reference voltage after use, the system recovers the charge by reconnecting the source capacitance to the power source, which then replenishes it for the next switching operation. This recovery process eliminates the energy loss associated with discharging to reference voltage
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
This approach reduces power consumption and accelerates the setup time of decode paths by enabling efficient charge sharing between capacitances, thereby improving the overall performance of the decode switch.
Implementation Method 1
The at least one source capacitance is connected to the target capacitance and the at least one source capacitance charges the target capacitance to a second voltage
Data Source
AI summary
A decode switch and a method for controlling a decode switch are provided. The decode switch includes a power source providing a first voltage, a source capacitance coupled to the power source, and a target capacitance coupled to the power source. The power source charges the source capacitance to the first voltage. The source capacitance is connected to the target capacitance and the source capacitance charges the target capacitance to a second voltage. The power source charges the target capacitance from the second voltage to the first voltage.