# clock rate

(redirected from Operating frequency)

[′kläk ‚rāt]
(electronics)

## 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.
References in periodicals archive ?
4 GHz operating frequency range (low, high or full band) to avoid frequency conflicts.
The operating frequency range is 200 MHz/400 Mb/s, and typical parallel test capacity is 768 DUTs.
4(a), we have a view of the whole system in plane Y-Z at the first operating frequency (2.
Compared to Renesas Electronics' existing 288Mb low-latency DRAM devices, the new devices feature 4x the memory capacity, a 30% faster random-cycle performance for high-speed data reads and writes, as well as twice the operating frequency.
In addition to replacing the antennas, Northrop Grumman will modify the B-2 defensive management system and the radar transponder to support the change in operating frequency.
The unit's operating frequency range is ten Hz to ten MHz.
Where prescalers are not available (for advanced synthesizers with a maximum operating frequency greater than 18 GHz, for example), frequency conversion can be performed with a subharmonic mixer and a local oscillator (LO).
Features include an operating frequency range from 20 to 60 MHz with several standard frequencies available.
Illinois team leader Hadis Morkoc estimates that his group's transistor, a type of semiconductor device called a modulation-doped field-effect transistor (MODFET), has a maximum operating frequency of 230 billion hertz (GHz) -- about one and a half times higher than the previous MODFET record.
The PM-6010 features the advantages of an integrated PFC and LLC allowing high operating frequency capability, on chip power conversion devices for improved energy and heat dissipation, and multiple built-in protection functions.
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).
Detectors are available with narrower operating frequency bands with improved performance.

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