Operation of the square-triangular wave oscillator

Operation of the square-triangular wave oscillator -...

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Operation of the square/triangular wave oscillator An operation amplifier circuit that creates both a square wave and a triangular wave is comprised of three separate stages as shown in Figure 1: 1) the positive feedback op-amp known as the Schmitt trigger (OP 1), 2) a negative feedback op-amp known as the integrator (OP2) and 3) an inverting operational amplifier (OP 3). First let’s discuss how we can get a square wave response from this circuit. The square wave is essentially the output voltage produced by the Schmitt trigger. The Schmitt trigger is a modification of the positive feedback operational amplifier. A positive feedback op-amp takes in noise and amplifies it. This amplified noise is outputted in the Vout. However, the Vout in the positive feedback op-amp is looped back to the V+ input of the op amp, thus adding to the V+. According to the formula for an op- amp, Vout = Aol(V+ - V-), the output voltage will increase until it hits Vcc or –Vcc. This op-amp is called a comparator since it toggles between values of Vcc or –Vcc depending
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This note was uploaded on 03/31/2009 for the course ECE 210 taught by Professor Staff during the Spring '08 term at Cornell.

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