What is clock spread spectrum?
Table of Contents
What is clock spread spectrum?
Spread spectrum clocking (SSC) is a special way to reduce the radiated emissions of digital clock signals. SSC is the variation of the frequency of a clock signal in a controlled way. In the frequency domain, the SSC reduces the peak amplitude of a digital clock signal by shifting the frequency.
What is spread spectrum clocking PCIE?
Spread Spectrum Clocking (SSC) is a highly effective technique utilized to reduce electromagnetic interference or EMI. PCI Express 5.0 System designers use this tool to reduce the adverse effects on adjacent circuits and to pass FCC or other regulatory body requirements for EMI emissions.
Which of the following is the main characteristics of spread spectrum?
The spread spectrum signals have the signal strength distributed as shown in the following frequency spectrum figure. Band of signals occupy a wide range of frequencies. Power density is very low. Energy is wide spread.
Why spread spectrum is used in wireless communication?
Usage of Spread Spectrum There are many reasons to use this spread spectrum technique for wireless communications. The following are some reasons: It can successfully establish a secure medium of communication. It can increase the resistance to natural interference, such as noise and jamming, to prevent detection.
What is a reference clock?
A master clock used as a timekeeping standard to regulate or compare the accuracy of other clocks. In electronics and computing, the clock signal used to synchronise and schedule operations.
What is CPU PCIe spread spectrum in BIOS?
The PCIE Spread Spectrum BIOS feature controls spread spectrum clocking of the PCI Express interconnect. When set to Down Spread, the motherboard modulates the PCI Express interconnect’s clock signal downwards by a small amount.
What are the different spread spectrum techniques?
There are four techniques of spread spectrum namely direct sequence spread spectrum (DSSS), frequency hopping spread spectrum (FHSS), chirp spread spectrum (CSSS) and time hopping spread spectrum (THSS).
What are the applications and advantages of spread spectrum techniques?
Advantages and applications of spread spectrum
- Spread spectrum signals are highly resistant to the jamming.
- Many users can share a signal band with no interference.
- Unauthorized listening is prevented.
- Unintentional interference occupying the same band is greatly minimized and in most cases virtually eliminated.
What are the 2 types of spread spectrum?
There are four generic types of spread spectrum signals:
- Direct Sequence (DS) – The carrier of a DS source stays at a fixed frequency. Narrowband information is spread out into a much larger bandwidth using a pseudo-random chip sequence.
- Pseudo noise (PN)
- Frequency Hopping (FHA)
- Linear Frequency Modulation (chirp)
What is spread spectrum & Types?
Spread Spectrum can be categorized into two types: Frequency Hopping Spread Spectrum (FHSS) Direct Sequence Spread Spectrum(DSSS)
Why do we need clock?
The primary purpose of a clock is to display the time. Clocks may also have the facility to make a loud alert signal at a specified time, typically to waken a sleeper at a preset time; they are referred to as alarm clocks.
What is time Slew?
In electronics, slew rate is defined as the change of voltage or current, or any other electrical quantity, per unit of time. Expressed in SI units, the unit of measurement is volts/second or amperes/second, but is usually expressed in terms of microseconds (μs) or nanoseconds (ns).
Should I turn off spread spectrum?
As you can imagine, even the smallest variation in a clocking signal can be enough to create data transfer errors. The fundamentals of overclocking demand the cleanest, purest signal possible, which is why spread spectrum should always be disabled unless you have a good reason to enable it.
What are the four main types of spread spectrum?
