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  2. RF modulator - Wikipedia

    en.wikipedia.org/wiki/RF_modulator

    An RF modulator (radio frequency modulator) is an electronic device used to convert signals from devices such as media players, VCRs and game consoles to a format that can be handled by a device designed to receive a modulated RF input, such as a radio or television receiver. Its input is a baseband signal, which is used to modulate a radio ...

  3. Frequency synthesizer - Wikipedia

    en.wikipedia.org/wiki/Frequency_synthesizer

    Frequency synthesizer. A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency. Frequency synthesizers are used in devices such as radio receivers, televisions, mobile telephones, radiotelephones, walkie-talkies, CB radios, cable television converter boxes, satellite receivers ...

  4. Frequency modulation - Wikipedia

    en.wikipedia.org/wiki/Frequency_modulation

    Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and computing. In analog frequency modulation, such as radio broadcasting, of an audio signal representing voice or music, the ...

  5. IQ imbalance - Wikipedia

    en.wikipedia.org/wiki/IQ_imbalance

    IQ imbalance. IQ imbalance is a performance-limiting issue in the design of a class of radio receivers known as direct conversion receivers. [a] These translate the received radio frequency (RF, or pass-band) signal directly from the carrier frequency to baseband using a single mixing stage. [b]

  6. Quadrature amplitude modulation - Wikipedia

    en.wikipedia.org/wiki/Quadrature_amplitude...

    t. e. Quadrature amplitude modulation (QAM) is the name of a family of digital modulation methods and a related family of analog modulation methods widely used in modern telecommunications to transmit information. It conveys two analog message signals, or two digital bit streams, by changing (modulating) the amplitudes of two carrier waves ...

  7. Heterodyne - Wikipedia

    en.wikipedia.org/wiki/Heterodyne

    The direct-conversion (heterodyne) detector was invented to make continuous wave radio-frequency signals audible. [ 10 ] The "heterodyne" or "beat" receiver has a local oscillator that produces a radio signal adjusted to be close in frequency to the incoming signal being received.

  8. Direct-conversion receiver - Wikipedia

    en.wikipedia.org/wiki/Direct-conversion_receiver

    Direct-conversion receiver. A direct-conversion receiver (DCR), also known as homodyne, synchrodyne, or zero-IF receiver, is a radio receiver design that demodulates the incoming radio signal using synchronous detection driven by a local oscillator whose frequency is identical to, or very close to the carrier frequency of the intended signal.

  9. RF module - Wikipedia

    en.wikipedia.org/wiki/RF_module

    RF module (with a ruler for size reference) An RF module (short for radio-frequency module) is a (usually) small electronic device used to transmit and/or receive radio signals between two devices. In an embedded system it is often desirable to communicate with another device wirelessly. This wireless communication may be accomplished through ...