What term describes an electronic circuit that contains a piezoelectric crystal?

What term describes an electronic circuit that contains a piezoelectric crystal?

• A. Crystal-controlled Oscillator
• B. Hartley Oscillator
• C. LC Tank Oscillator
• D. Demodulation

Answer: (A)

A circuit containing a piezoelectric crystal is described as a crystal oscillator (crystal-controlled oscillator). The quartz crystal provides a highly stable, sharp resonance that sets the oscillator’s frequency. When placed in the feedback path of an amplifier, the crystal’s resonance forces the circuit to sustain oscillation at that precise frequency, giving excellent frequency stability. The other options refer to different approaches to generating oscillations or to processing signals. A Hartley oscillator uses a tapped coil to establish feedback and its frequency is set by the LC network, not a crystal. An LC tank oscillator relies on an LC resonant circuit for frequency, again without a crystal. Demodulation, on the other hand, is a detection process that extracts the information from a modulated signal, not an oscillator.

A circuit containing a piezoelectric crystal is described as a crystal oscillator (crystal-controlled oscillator). The quartz crystal provides a highly stable, sharp resonance that sets the oscillator’s frequency. When placed in the feedback path of an amplifier, the crystal’s resonance forces the circuit to sustain oscillation at that precise frequency, giving excellent frequency stability.

The other options refer to different approaches to generating oscillations or to processing signals. A Hartley oscillator uses a tapped coil to establish feedback and its frequency is set by the LC network, not a crystal. An LC tank oscillator relies on an LC resonant circuit for frequency, again without a crystal. Demodulation, on the other hand, is a detection process that extracts the information from a modulated signal, not an oscillator.