Switch Control Circuit With Non-Overlapping Enable Timing
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Solution Overview
Problem
Existing switch control circuitry in wireless communication systems faces issues with current surge due to concurrent switching of supply nodes, leading to reduced battery life and potential frequency instability in voltage-controlled oscillators.
Innovation Solution
A circuit comprising flip-flops, a NOR gate, AND gates, and a delay element generates non-overlapping enable signals to control switches, disabling the control mechanism for a specific time period when an enable signal transitions, preventing concurrent switching and reducing current surge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switch control circuitry is used to control multiple switches, then the switching operation is simple and fast, but current surge occurs due to concurrent switching of supply nodes
Solution Approach 1:
The delay element introduces a time advance mechanism that disables the control mechanism before concurrent switching can occur. When an enable signal transitions, the delay element proactively generates a disabled state that prevents subsequent switches from activating during the vulnerable transition period, thereby preventing current surge before it happens.
Solution Approach 2:
The delay element acts as an intermediary between the enable signals and the control mechanism. It mediates the timing relationship between multiple switches by introducing a controlled delay that ensures sequential operation rather than concurrent switching, thus preventing current surge while maintaining circuit control.
2Reliability
If switches are controlled simultaneously without delay, then the control mechanism is simple and responsive, but frequency instability occurs in voltage-controlled oscillators
Solution Approach 1:
The delay element performs preliminary action by preemptively disabling the control mechanism during the critical transition period. This preliminary disabling prevents the oscillator from experiencing frequency instability caused by concurrent switching, while the delay duration is carefully controlled to minimize impact on overall system timing.
3Duration of action of moving object
If concurrent switching of supply nodes is allowed, then battery life is reduced due to current surge, but switching speed is maintained
Solution Approach 1:
The delay element serves as a timing intermediary that sequences switch activation. It maintains acceptable switching speed by enabling switches in rapid succession while preventing simultaneous activation that would cause current surge and battery drain, thus optimizing both battery life and switching performance.
Data Source
AI summary
Certain aspects of the present disclosure are directed to a circuit for switch control. The circuit generally includes a plurality of flip-flops, each of the plurality of flip-flops having an input coupled to a respective one of a plurality of enable signals, a NOR gate having inputs coupled to outputs of the plurality of flip-flops; a plurality of AND gates, each having an input coupled to a respective one of the plurality of enable signals and having another input coupled to an output of the NOR gate, and a delay element coupled between the output of the NOR gate and reset inputs of the plurality of flip-flops.