A circuit that compares the output of a...

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Question 1 of 20a88Q01Sf8YwzUvM0PjF4

A circuit that compares the output of a voltage-controlled oscillator (VCO) to a frequency standard and produces an error voltage that is then used to adjust the capacitance of a varactor diode used to control frequency in that same VCO is called what?

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a88Q01Sf8YwzUvM0PjF4

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🔍 Key Concepts

• Voltage-controlled oscillator (VCO) – what it is and how its frequency is controlled • Feedback/control loops that compare an output to a reference and generate an error voltage • The role of a varactor diode in tuning/controlling frequency

💭 Think About

• Which type of circuit takes a signal, compares it to a stable reference, and then automatically adjusts something to reduce the difference? • Look at the key words: comparison to a frequency standard, creation of an error voltage, and using that to adjust the VCO. Which option is specifically known for locking one signal to another? • Which answer choice describes an entire control system, not just a single amplifier or oscillator component?

✅ Before You Answer

• Verify which choice is specifically designed to lock an oscillator’s frequency and phase to a reference signal. • Check that the circuit in your chosen answer both compares signals and feeds back a correction voltage to the VCO. • Eliminate any option that is only a basic building block (like a simple amplifier or oscillator) and not a complete feedback loop system.

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