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  2. Detector (radio) - Wikipedia

    en.wikipedia.org/wiki/Detector_(radio)

    In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage. The term dates from the first three decades of radio (1888–1918). The term dates from the first three decades of radio (1888–1918).

  3. Phase detector - Wikipedia

    en.wikipedia.org/wiki/Phase_detector

    A phase frequency detector (PFD) is an asynchronous circuit originally made of four flip-flops (i.e., the phase-frequency detectors found in both the RCA CD4046 and the motorola MC4344 ICs introduced in the 1970s). The logic determines which of the two signals has a zero-crossing earlier or more often.

  4. Foster–Seeley discriminator - Wikipedia

    en.wikipedia.org/wiki/Foster–Seeley_discriminator

    The Foster–Seeley discriminator [1] [2] is a common type of FM detector circuit, invented in 1936 by Dudley E. Foster [3] and Stuart William Seeley. The Foster–Seeley discriminator was envisioned for automatic frequency control of receivers, but also found application in demodulating an FM signal.

  5. Envelope detector - Wikipedia

    en.wikipedia.org/wiki/Envelope_detector

    An envelope detector (sometimes called a peak detector) is an electronic circuit that takes a (relatively) high-frequency signal as input and outputs the envelope of the original signal. Diode detector

  6. Charge-pump phase-locked loop - Wikipedia

    en.wikipedia.org/wiki/Charge-pump_phase-locked_loop

    Phase-frequency detector dynamics. Phase-frequency detector (PFD) is triggered by the trailing edges of the reference (Ref) and controlled (VCO) signals. The output signal of PFD () can have only three states: 0, +, and .

  7. Costas loop - Wikipedia

    en.wikipedia.org/wiki/Costas_loop

    In the classical implementation of a Costas loop, [4] a local voltage-controlled oscillator (VCO) provides quadrature outputs, one to each of two phase detectors, e.g., product detectors. The same phase of the input signal is also applied to both phase detectors, and the output of each phase detector is passed through a low-pass filter. The ...

  8. Frequency mixer - Wikipedia

    en.wikipedia.org/wiki/Frequency_mixer

    The mixer circuit can be used not only to shift the frequency of an input signal as in a receiver, but also as a product detector, modulator, phase detector or frequency multiplier. [6] For example, a communications receiver might contain two mixer stages for conversion of the input signal to an intermediate frequency and another mixer employed ...

  9. Phase-locked loop - Wikipedia

    en.wikipedia.org/wiki/Phase-locked_loop

    A simple analog PLL is an electronic circuit consisting of a variable frequency oscillator and a phase detector in a feedback loop (Figure 1). The oscillator generates a periodic signal V o with frequency proportional to an applied voltage, hence the term voltage-controlled oscillator (VCO).

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