# clock rate

(redirected from Operating frequency)

## clock rate

[′kläk ‚rāt]
(electronics)
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 It might be outdated or ideologically biased.

## Clock Rate

the change in clock correction per unit time. Different types of clock rates, such as diurnal and hourly, are distinguished, depending on the unit of time selected. With a negative clock rate, the clock runs fast; with a positive rate, it falls progressively behind true time. The magnitude of the clock rate depends on the adjustment of the clock but is not a reflection of the clock’s quality. It is affected by various factors related to the design of the clock mechanism and to external conditions of its operation. Therefore, whenever the precise time is required, as for example in astronomy, several clocks are used, and their rates are carefully studied by daily comparisons of their readings.

## clock rate

(processor, benchmark)
The fundamental rate in cycles per second at which a computer performs its most basic operations such as adding two numbers or transfering a value from one register to another.

The clock rate of a computer is normally determined by the frequency of a crystal. The original IBM PC, circa 1981, had a clock rate of 4.77 MHz (almost five million cycles/second). As of 1995, Intel's Pentium chip runs at 100 MHz (100 million cycles/second). The clock rate of a computer is only useful for providing comparisons between computer chips in the same processor family. An IBM PC with an Intel 486 CPU running at 50 MHz will be about twice as fast as one with the same CPU, memory and display running at 25 MHz. However, there are many other factors to consider when comparing different computers. Clock rate should not be used when comparing different computers or different processor families. Rather, some benchmark should be used. Clock rate can be very misleading, since the amount of work different computer chips can do in one cycle varies. For example, RISC CPUs tend to have simpler instructions than CISC CPUs (but higher clock rates) and pipelined processors execute more than one instruction per cycle.

## clock speed

The internal heartbeat of a computer, also known as "clock rate." The clock circuit uses fixed vibrations generated from a quartz crystal to deliver a steady stream of pulses to the CPU. See clock and MHz.
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References in periodicals archive ?
Because this proposed structure has considerable design freedom, different given operating frequency bands can be easily achieved during the design process according to the length of the arc-shaped slot and the number of the switching components.
The UPG2301TQ has an operating frequency of 2.4 to 2.5 GHz, a single supply voltage of 3.3 V typical, power gain of 23 dB typical and an efficiency of 50 percent typical.
In addition to its high operating frequency, the V850E/MA3 microcontroller achieves its high performance by providing up to 512 kilobytes (KB) of on-chip ROM and 32 KB of on-chip random access memory (RAM).
The SH7727 has a 160MHz/100MHz operating frequency incorporating a USB Host, USB Function and colour LCD controller on a single chip.
Usually, the frequency band of the low structural mode scattering does not coincide with the operating frequency band of the antenna, so the inband scattering of a conventional microstrip patch antenna can be even larger than the scattering in the outside band.
The operating frequency range is 200 MHz/400 Mb/s, and typical parallel test capacity is 768 DUTs.
All modules are screened at the operating frequency prior to shipment for guaranteed performance.
Dolphin's system requires substantially fewer transmitters than GSM networks because of its combination of TETRA technology and a lower operating frequency.

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