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  2. Gilbert cell - Wikipedia

    en.wikipedia.org/wiki/Gilbert_cell

    Such circuits are widely used for frequency conversion in radio systems. [1] The advantage of this circuit is the output current is an accurate multiplication of the (differential) base currents of both inputs. As a mixer, its balanced operation cancels out many unwanted mixing products, resulting in a "cleaner" output.

  3. Frequency mixer - Wikipedia

    en.wikipedia.org/wiki/Frequency_mixer

    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.

  4. Reference designator - Wikipedia

    en.wikipedia.org/wiki/Reference_designator

    Separable assembly or sub-assembly (e.g. printed circuit assembly) AT: Attenuator or isolator: BR: Bridge rectifier (four diodes in a package) often changed to "D" for diode BT, BAT: Battery or battery holder: often shortened to "B" C: Capacitor: CB: Circuit breaker: CN: Capacitor network: may be simplified to "C" for capacitor D, CR: Diode ...

  5. Heterodyne - Wikipedia

    en.wikipedia.org/wiki/Heterodyne

    Frequency mixer symbol used in schematic diagrams. A heterodyne is a signal frequency that is created by combining or mixing two other frequencies using a signal processing technique called heterodyning, which was invented by Canadian inventor-engineer Reginald Fessenden.

  6. Electronic mixer - Wikipedia

    en.wikipedia.org/wiki/Electronic_mixer

    Additive mixers are also known as analog adders to distinguish from the related digital adder circuits. Simple additive mixers use Kirchhoff's circuit laws to add the currents of two or more signals together, and this terminology ("mixer") is only used in the realm of audio electronics where audio mixers are used to add together audio signals ...

  7. Radio transmitter design - Wikipedia

    en.wikipedia.org/wiki/Radio_transmitter_design

    Series PDM modulators are used in solid state transmitters also, but the circuits are somewhat more complex, using push pull or bridge circuits for the RF section. These simplified diagrams omit such details as filament, screen and grid bias supplies, and the screen and cathode connections to RF ground.

  8. Harmonic mixer - Wikipedia

    en.wikipedia.org/wiki/Harmonic_mixer

    One classic design for a harmonic mixer uses a step recovery diode (SRD). [1] The mixer's subharmonic input is first amplified to a power level that might be around 1 watt. That signal then drives a step recovery diode impulse generator circuit that turns the sine wave into something approximating an impulse train.

  9. Pentagrid converter - Wikipedia

    en.wikipedia.org/wiki/Pentagrid_converter

    Circuit symbol of a heptode. The development of the pentagrid or heptode (seven-electrode) valve was a novel development in the mixer story. The idea was to produce a single valve that not only mixed the oscillator signal and the received signal and produced its own oscillator signal at the same time but, importantly, did the mixing and the oscillating in different parts of the same valve.