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Modulator |
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Modulator Any device or circuit by means of which a desired signal is impressed upon a higher-frequency periodic wave known as a carrier. The process is called modulation. The modulator may vary the amplitude, frequency, or phase of the carrier. There are many ways to accomplish amplitude modulation, but in all cases a nonlinear element or device must be employed. The modulating signal controls the characteristics of the nonlinear device and thereby controls the amplitude of the carrier. See Amplitude-modulation detector, Amplitude modulator The frequency modulator usually changes the effective capacitance or inductance in the frequency-determining LC circuit of the oscillator. However, other techniques can be used. For example, a multivibrator can be used to generate carrier frequencies up to a few megahertz, and the multivibrator frequency can be modulated by controlling the base, gate, or grid bias supply voltage. See Frequency modulator How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Tokyo, Japan, Sept 29, 2006 - (JCN) - The National Institute of Information and Communications Technology (NICT) today announced its launch of a high speed optical modulator for light network. 12 Nature, he and his Intel colleagues in Santa Clara and in Jerusalem report making a prototype silicon modulator that changes a laser beam's intensity in order to signal the 1s and 0s of digital information (SN: 4/8/00, p. Nasdaq: RFMD), a provider of proprietary radio frequency integrated circuits (RFICs) for wireless communications applications has announced the introduction of the RF2485 quadrature modulator for Terrestrial Trunked Radio (TETRA) systems. |
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