When a mechanical switch is activated, it often causes a phenomenon known as "switch bounce" or "jitter." In certain control circuits, this can lead to errors or instability, making it essential to eliminate such issues. One effective solution is the use of a single-pulse generator circuit, which helps remove the jitter from mechanical switches and ensures clean, reliable signal transitions.
Figure: Single-pulse generator circuit
During the power-up phase, the R and C components reset IC1, setting Q1 and Q2 to 0. The J-K flip-flop IC1 is configured as a 2-bit shift register. When the switch K is set to position 'a', gate C outputs a '1'. Upon receiving a CP pulse, Q1 becomes 1, and J1 is also set to 1. If the switch K experiences jitter, but remains in the 'a' position, the output of gate C remains at '1'. When the next CP pulse arrives, Q2 becomes 1, and J2 is also set to 1. The state changes of Q1 and -Q2 occur within one CP pulse cycle. After passing through NAND gate 2A, a single pulse is generated. The resulting waveform is illustrated in the figure below.
Figure: Single-pulse generator waveform
This circuit is particularly useful in digital systems where precise timing and stable signals are crucial. By filtering out the unwanted oscillations caused by mechanical switches, the single-pulse generator ensures accurate and consistent operation of the system. Whether in industrial automation, embedded systems, or digital control applications, this simple yet effective design plays a key role in improving overall performance and reliability.
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