Question
Which of the following is used to convert a signal from one frequency to another?
Answer Options
- A) Phase splitter
- B) Mixer
- C) Inverter
- D) Amplifier
Correct Answer: B
Explanation
The circuit designed to combine two input signals of different frequencies (often f1 and f2) to produce a third signal is the Mixer. This process, called mixing or heterodyning, creates signals that are the sum and difference of the two original frequencies (f1 \pm f2).
Mixers are essential components in both receivers and transmitters. In a receiver, the mixer shifts the incoming signal down to a lower, fixed frequency (the Intermediate Frequency or IF) where it is easier to filter and amplify. In a transmitter, it shifts a low-frequency signal up to the desired output frequency.
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