Question
What circuit is used to select one of the sidebands from a balanced modulator?
Answer Options
- A) Carrier oscillator
- B) Filter
- C) IF amplifier
- D) RF amplifier
Correct Answer: B
Explanation
The generation of a Single Sideband (SSB) signal begins with a balanced modulator, which mixes the audio input with a carrier signal. The output of the balanced modulator is a Double Sideband, Suppressed Carrier (DSB-SC) signal, containing both the upper and lower sidebands but with the carrier removed.
To create the final SSB signal, a highly selective filter is then used to remove one of the sidebands, leaving only the desired sideband (either USB or LSB) to be amplified and transmitted. This filter must be very sharp to ensure clean suppression of the unwanted sideband and prevent ‘sideband noise’.
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