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Frequency mixer symbol. In electronics, a mixer, or frequency mixer, is an electrical circuit that creates new frequencies from two signals applied to it.In its most common application, two signals are applied to a mixer, and it produces new signals at the sum and difference of the original frequencies.
Additive mixers add two or more signals, giving out a composite signal that contains the frequency components of each of the source signals.The simplest additive mixers are resistor networks, and thus purely passive, while more complex matrix mixers employ active components such as buffer amplifiers for impedance matching and better isolation.
Intermediate frequency tends to be lower frequency range compared to the transmitted RF frequency. However, the choices for the IF are most dependent on the available components such as mixer, filters, amplifiers and others that can operate at lower frequency. There are other factors involved in deciding the IF, because lower IF is susceptible ...
By the 1970s and 1980s, though, portable PA systems were typically sold as three-piece sets: an amp-mixer containing a small mixer (with four to six channels) and a power amplifier integrated into a single amp head-style chassis with a handle, and two separate PA speakers. The speakers were typically connected to the amp-mixer with speaker cables.
The mixer uses a non-linear component to produce both sum and difference beat frequency signals, [12] each one containing the modulation in the desired signal. The output of the mixer may include the original RF signal at f RF, the local oscillator signal at f LO, and the two new heterodyne frequencies f RF + f LO and f RF − f LO. The mixer ...
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude (magnitude of the voltage or current) of a signal applied to its input ...
Both signals are multiplied by the mixer, and the difference frequency, the intermediate frequency, is taken from the upper drain of the cascode mixer. This was further developed by cascoding whole differential-amplifier stages to form the balanced mixer, and then the Gilbert cell double-balanced mixer [citation needed].
Frequency multipliers have much in common with frequency mixers, and some of the same nonlinear devices are used for both: transistors operated in Class C and diodes. In transmitting circuits many of the amplifying devices ( vacuum tubes or transistors) operate nonlinearly and create harmonics, so an amplifier stage can be made a multiplier by ...
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