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© 2008 The McGraw-Hill Companies

19

9-2: Superheterodyne Receivers

Mixers and Local Oscillators

The output of the RF amplifier is applied to the input of the mixer.

The mixer also receives an input from a local oscillator or frequency synthesizer.

The mixer output is the input signal, the local oscillator signal, and the sum and difference frequencies of these signals.

A tuned circuit at the output of the mixer selects the difference frequency, or intermediate frequency (IF).

The local oscillator is made tunable so that its frequency can be adjusted over a relatively wide range.

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