Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In telecommunications, a mixer is a nonlinear or time-varying circuit or device that accepts as its input two different frequencies and presents at its output a mixture of signals at several frequencies: the sum of the frequencies of the input signals; the difference between the frequencies of the input signals; both original input frequencies - these are often considered parasitic and are filtered out in subsequent filter stages; a balanced mixer passes only a small leakage of the original signal to the output, often implemented as a double balanced mixer which has high isolation of both inputs; unwanted intermodulation products from the inputs. This nonlinear effect can be created by using a nonlinear electrical component, such as a diode. The time-varying effect can be created using a multiplier circuit such as a Gilbert Cell or passive switches. The manipulations of frequency performed by a mixer can be used to move signals between bands, or to encode and decode them. One other application of a mixer is as a product detector.

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