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Operational Amplifier Circuits Comparators and Positive ...

Operational Amplifier Circuits Comparators and Positive Feedback Comparators : Open Loop Configuration The basic comparator circuit is an op-amp arranged in the open-loop configuration as shown on the circuit of Figure 1. The op-amp is characterized by an open-loop gain A and let s assume that the output voltage Vo can go all the way to VDD and VEE. The output voltage is given by (Vo = A V + V ) ( ) Where V+ and V correspond to the voltages at the non-inverting and the inverting terminals respectively.

Where V+ and V− correspond to the voltages at the non-inverting and the inverting terminals respectively. VDD V V in V o V EE ref Figure 1. Basic non-inverting comparator. For the circuit on Figure 1, V+ =Vin and V− = Vref . For Vref = 0 , the voltage transfer characteristic Vo versus Vin is as shown on Figure 2. V o V in V EE V DD v δ+ v ...

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