Back to the full dot-point answer
WalesElectronicsQuick questions
Component 1: Operational Amplifiers
Quick questions on Op-amp properties, comparator and Schmitt trigger - WJEC A-Level Electronics
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the problem with a plain comparator?Show answer
A plain comparator has a single switching point. If the input is noisy and changes slowly, it crosses the reference repeatedly, and the output chatters between high and low. This false multiple switching is unacceptable in, say, a count or a control output.
What is q1?Show answer
State two properties of an ideal op-amp and what each means for the input current and the output voltage. [2 marks]
What is q2?Show answer
A comparator has its non-inverting input at a reference. The inverting input rises to . State the output (high or low) and why.
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.