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  2. File:Circuit diagram for six types of balanced line antenna ...

    en.wikipedia.org/wiki/File:Circuit_diagram_for...

    English: The image gives six circuit diagrams (schematics) for balanced line antenna tuners of the tuned-transformer type, discussed in the Wikipedia article "Antenna Tuner" or "ATU". It is an edited version of the original by JNRSTANLEY uploaded 2014-10-15.

  3. Armstrong phase modulator - Wikipedia

    en.wikipedia.org/wiki/Armstrong_phase_modulator

    In the Armstrong method, the audio signal and the radio frequency carrier signal are applied to the balanced modulator to generate a double sideband suppressed carrier signal. The phase of this output signal is then shifted 90 degrees with respect to the original carrier. The balanced modulator output can either lead or lag the carrier's phase.

  4. Radio transmitter design - Wikipedia

    en.wikipedia.org/wiki/Radio_transmitter_design

    The tank circuit (LC), connected to the collector via a capacitor, contains a pair of varicap diodes. As the voltage applied to the varicaps is changed, the phase shift of the output will change. Phase modulation is mathematically equivalent to direct Frequency modulation with a 6 dB/octave high-pass filter applied to the modulating signal ...

  5. NE612 - Wikipedia

    en.wikipedia.org/wiki/NE612

    Block diagram. The NE612 is an integrated circuit for processing of signals, such as in the transmission of radio signals. It consists of a oscillator and a mixer. [1] It can handle signal frequencies of up to 500 MHz and local oscillator frequencies of up to 200 MHz.

  6. Balanced circuit - Wikipedia

    en.wikipedia.org/wiki/Balanced_circuit

    Unbalanced, symmetrical circuit. Fig. 3. Balanced, asymmetrical circuit. Fig. 4. Balanced, symmetrical circuit. A balanced circuit will normally show a symmetry of its components about a horizontal line midway between the two conductors (example in figure 3). This is different from what is normally meant by a symmetrical circuit, which is a ...

  7. 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.

  8. Doherty amplifier - Wikipedia

    en.wikipedia.org/wiki/Doherty_amplifier

    The Doherty amplifier is a modified class B radio frequency amplifier invented by William H. Doherty of Bell Telephone Laboratories Inc in 1936. Whereas conventional class B amplifiers can clip on high input-signal levels, the Doherty power amplifier can accommodate signals with high peak-to-average power ratios by using two amplifier circuits within the one overall amplifier to accommodate ...

  9. Power amplifier classes - Wikipedia

    en.wikipedia.org/wiki/Power_amplifier_classes

    The diagram shows a waveform from a simple class-C circuit without the tuned load. This is called untuned operation, and the analysis of the waveforms shows the massive distortion that appears in the signal. When the proper load (e.g., an inductive-capacitive filter plus a load resistor) is used, two things happen.

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