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Which circuit is used to produce the IF for better selection and filtering?

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Which circuit is used to produce the IF for better selection and filtering?

(a) Downconverter

(b) Modulator

(c) RC circuit

(d) Gating circuit

This question was addressed to me in my homework.

The question is from Data Conversion topic in chapter Digital Communication Techniques of Avionics

1 Answer

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Best answer
Right option is (a) Downconverter

The explanation: In radio receivers, a high-frequency signal is converted to a lower mixed frequency called an intermediate frequency (IF) where it can be more adequately filtered for improved frequency selection. A downconverter is a circuit that performs this equivalent of aliasing.

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