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Aclock generator is anelectronic oscillator that produces aclock signal for use in synchronizing a circuit's operation. The outputclock signal can range from a simple symmetricalsquare wave to more complex arrangements. The basic parts that all clock generators share are a resonant circuit and an amplifier.

The resonant circuit is usually aquartzpiezo-electricoscillator, although simplertank circuits and evenRC circuits may be used.

Theamplifier circuit usually inverts the signal from the oscillator and feeds a portion back into the oscillator to maintain oscillation.

The generator may have additional sections to modify the basic signal. The8088 for example, used a 2/3duty cycle clock, which required the clock generator to incorporate logic to convert the 50/50 duty cycle which is typical of raw oscillators.

Other such optional sections includefrequency divider orclock multiplier sections. Programmable clock generators allow the number used in the divider or multiplier to be changed, allowing any of a wide variety of output frequencies to be selected without modifying the hardware.

The clock generator in amotherboard is often changed by computer enthusiasts to control the speed of aCPU,FSB,GPU orRAM. Typically the programmable clock generator is set by theBIOS at boot time to the selected value; although some systems havedynamic frequency scaling, which frequently re-programs the clock generator.

TSGs areclocks that are used throughout service-provider networks, frequently as the building integrated timing supply (BITS) for a central office.^{[citation needed]}

Digital switching systems and some transmission systems (e.g.,SONET, RREX, LUBI) depend on reliable, high-quality synchronization (or timing) to prevent impairments. To provide this, most service providers use interoffice synchronization distribution networks based on the stratum hierarchy and implement the BITS concept to meet intraoffice synchronization needs.^{[citation needed]}

A TSG is clock equipment that accepts input timing reference signals and generates output timing reference signals. The input reference signals can be either DS1 or composite-clock (CC) signals, and the output signals can also be DS1 or CC signals (or both). A TSG is made up of the six components listed below:^{[citation needed]}

1. An input timing interface that accepts DS1 or CC input signals
2. A timing-generation component that creates the timing signals used by the output timing-distribution component
3. An output timing distribution component that utilizes the timing signals from the timing-generation component to create multiple DS1 and CC output signals
4. A performance-monitoring (PM) component that monitors the timing characteristics of the input signals
5. An alarm interface that connects to the central-office (CO) alarm-monitoring system
6. An operations interface for local crafts person use and communications with remote operations systems

• Pulse generator – Electronic circuit or test equipment

• Datasheets of clock generators from Nuvoton / Winbond
• Datasheets of clock generators from IDT
• Datasheets of clock generators from Realtek
• Datasheets of clock generators from Pericom SemiconductorArchived 2016-07-19 at theWayback Machine

• Clock signal
• Electronic oscillators

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