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| 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? |
| A) Doubly balanced mixer. |
| B) Phase-locked loop. |
| C) Differential voltage amplifier. |
| D) Variable frequency oscillator. |
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