# Frequency Divider

(redirected from Frequency division)

## frequency divider

[′frē·kwən·sē di‚vīd·ər]
(electronics)
A harmonic conversion transducer in which the frequency of the output signal is an integral submultiple of the input frequency. Also known as counting-down circuit.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Frequency Divider

an electronic device that reduces by an integral factor the frequency of periodic oscillations supplied to it. Frequency dividers are used in frequency synthesizers, in quartz-crystal and atomic clocks, in television apparatus (to synchronize scanning generators), and as timing devices in radar. Electronic counters, self-excited sine-wave generators, regenerative devices, self-excited oscillators with phase-locked frequency control, and relaxation generators are used to divide frequencies.

In a self-excited sine-wave generator, frequency division is achieved by synchronizing the generator’s frequency with a subharmonic oscillation of the frequency of the external periodic signal by means of the locking effect. In a regenerative frequency divider for sine waves, the periodic signal of frequency f, which is to be divided, and a signal of frequency (k - 1)·flk (where k is the scaling ratio), which is produced in the feedback circuit only when a voltage of the frequency being converted is fed to the input of the frequency divider, are fed to the frequency converter. The difference-frequency signal, equal tof/k, is obtained at the converter’s output. In apparatus consisting of a self-excited oscillator with phase-locked frequency control, a phase detector compares the frequency of a harmonic oscillation k times greater than the fundamental frequency of the oscillator with the divided frequency. An error voltage from the output of the phase detector, which is proportional to the difference between the frequencies being compared, is fed to the oscillator and varies its frequency until the divided frequency becomes exactly k times smaller. To divide the repetition rate of the pulse signals, relaxation generators are used as frequency dividers. These generators (multivibrators and blocking oscillators) operate in the periodic mode, with the pulse-repetition rate locked onto a subharmonic frequency, or in the driven mode, with a pulse-repetition period k times higher. In practice k does not exceed 10.

### REFERENCES

Frolkin, V. T. Impul’snye ustroistva, 2nd ed. Moscow, 1966.
Gonorovskii, I. S. Radiotekhnicheskie tsepi i signaly, part 2. Moscow, 1967.

IU. B. LIUBCHENKO

References in periodicals archive ?
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The software supports key features of 802.11ax including narrower subcarrier spacing, 1024-QAM and multi-user orthogonal frequency division multiple access (OFDMA).
Also last week, Cree said it had rebranded its power and radio frequency division, which includes APEI in Fayetteville, as Wolfspeed.
The US Naval Observatory (USNO) and the Time and Frequency Division of the National Institute of Standards and Technology (NIST) have signed a formal Memorandum of Understanding to align their respective Coordinated Universal Time (UTC) programs.
The resulting frequency division of colour enables a new type of colour display, which does not rely on colour filter wheels or dedicated blue and red pixels.
Rohde & Schwarz announced it has successfully verified combining various frequency bands in mixed-mode time division duplex (TDD) and frequency division duplex (FDD) mixed-carrier aggregation.
There are 36 commercial TD-LTE networks and we expect active TD-LTE connections to demonstrate a higher annual growth rate when compared to FD-LTE (Frequency Division) over the next five years," noted report author Nitin Bhas.
This was part of the installation of equipment for two new 4G frequency division channels.

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