Concept explainers
a.
The expression for the switching point and the crossover voltages.
a.
Answer to Problem 15.50P
The switching voltage
The lower crossover voltage of Schmitt trigger is
The upper crossover voltage of Schmitt trigger is
Explanation of Solution
Given:
The circuit is given as:
For the ideal operational amplifier, the currents in the inverting and the non-inverting terminal will be zero. By the virtual ground concept the inverting and the non-inverting node voltages will be equal.
Redrawing the circuit:
Applying nodal analysis at inverting node:
Applying nodal analysis at the non-inverting node:
Considering the
Hence, the switching voltage
Evaluating the upper crossover voltage of Schmitt trigger:
Hence, the upper crossover voltage of Schmitt trigger is
Evaluating the lower crossover voltage of Schmitt trigger:
Hence, the lower crossover voltage of Schmitt trigger is
b.
The R1 and VREF for the given condition.
b.
Answer to Problem 15.50P
The reference voltage is
Explanation of Solution
Given:
The circuit is given as:
The crossover voltages are
Substituting the
Hence,
Substitute,
Substitute
Hence,
Substituting,
Therefore, the reference voltage is
Substituting,
Hence, the reference voltage is
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Chapter 15 Solutions
MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)
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