Image frequency is given by ________(a) fs + fi(b) fs ± fi(c) fs + 2fi(d) fs ± 2fiThe question was asked in an interview.My question is from Costas Loop topic in section Double Sideband Suppressed Carrier Modulation of Analog Communications

Image frequency is given by ________(a) fs + fi(b) fs ± fi(c) fs + 2f

1.	Image frequency is given by ________(a) fs + fi(b) fs ± fi(c) fs + 2fi(d) fs ± 2fiThe question was asked in an interview.My question is from Costas Loop topic in section Double Sideband Suppressed Carrier Modulation of Analog Communications
Answer» Correct option is (c) fs + 2fi For explanation: In the superheterodyne receiver, during the frequency conversion process, the local oscillator and the mixer OFTEN allow an undesired frequency SIGNAL, in ADDITION to the incoming frequency signal. This results in the production of IMAGE frequency which is equal to the sum of signal frequency and DOUBLE intermediate frequency.

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Image frequency is given by ________(a) fs + fi(b) fs ± fi(c) fs + 2fi(d) fs ± 2fiThe question was asked in an interview.My question is from Costas Loop topic in section Double Sideband Suppressed Carrier Modulation of Analog Communications

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