- Joined Feb 24, 2006
The use of timers in digital and microprocessor circuits is common. Precise timing in analog circuits is less common, usually relying on RC circuits and such. In simulations we can use the behavioral current source or the behavioral voltage source along with mathematical functions to simulate precise delays with a simple component. In LTspice there is a function called "idt" which can integrate a constant current or constant voltage to produce a linear ramp effectively converting time to voltage. This ramp can then be used to create logic level signals where the edges have fixed time relationships to one another, The following LTspice simulation shows the implementation of both an On-Delay Timer and an Off-Delay Timer.
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