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Definition of "Mixer" |
A circuit that combines the outputs of two or more circuits into a common output. An Audio Mixer. A nonlinear circuit or device that accepts as its input two different frequencies and presents at its output (a) a signal equal in frequency to the sum of the frequencies of the input signals, (b) a signal equal in frequency to the difference between the frequencies of the input signals, (c) the original input frequencies, although the original frequencies may be filtered out. An RF Mixer Circuit. / a nonlinear device containing either diodes or transistors, the function of which is to combine signals of two different frequencies in such a way as to produce energy at other frequencies. In a typical down converter application, a mixer has two inputs and one output. One of the inputs is the modulated carrier RF or microwave signal at a frequency ƒ(rf) , the other is a well controlled signal from a local oscillator or VCO at a frequency ƒ(lo). The result of down conversion is a signal at the difference frequency ƒ(rf) −ƒ(lo), which is also called the intermediate frequency ƒ(if) . A filter is usually connected to the output of the mixer to allow only the desired IF frequency signal to be passed on for further processing. For example, for an RF frequency of 10.95 GHz (=10,950 MHz) and an LO frequency of 10 GHz (=10,000 MHz), the IF frequency would be 950 MHz. |
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