jitter

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jitter

(jĭt'ĕr),
The random variability of the cycle-to-cycle duration of vocal fold vibration; contributes to the perception of a rough or harsh voice quality.
Imaging Low amplitude irregularities in echo location on an ultrasound display, attributed to electronic noise, mechanical disturbances, and other nonspecific variables
Physiology Muscle jitter The normal electric variability—‘chaos’—measured by single-fiber EMG—in the interval between 2 action potentials of successive discharges of the same single muscle fiber in the same motor unit; jitter is characterised as instability in subcomponents of motor unit action potentials, and is due to the variation in the synaptic delay at the branch points in the distal axon and at the neuromuscular junction; like fiber density, jitter is increased in neuropathic conditions (motor neuron diseases)—e.g., myasthenia gravis—is accompanied by denervation and reinnervation, and attributed to inefficient transmission of impulses in recent neural collaterals, or due to blocking—abnormal neuromuscular transmission; it is normal or near-normal in myopathic disease
Psychology See Jitters

jitter

Imaging Low amplitude irregularities in echo location on an ultrasound display, attributed to electronic noise, mechanical disturbances, and other variables Neurophysiology Muscle jitter The normal electric variability–'chaos'–measured by single-fiber EMG–in the interval between 2 action potentials of successive discharges of the same single muscle fiber in the same motor unit; jitter is characterized as instability in subcomponents of motor unit action potentials, and is due to the variation in the synaptic delay at the branch points in the distal axon and at the neuromuscular junction; like fiber density, jitter is ↑ in neuropathic conditions–motor neuron diseases–eg, myasthenia gravis, is accompanied by denervation and reinnervation, and attributed to inefficient transmission of impulses in recent neural collaterals, or due to blocking–abnormal neuromuscular transmission; it is normal or near-normal in myopathic disease. See Fiber density, Single-fiber electromyography PsychologyJitters, see there.
References in periodicals archive ?
With RMS phase jitter less than 500 fsec over the full 12 kHz to 20 MHz integration range, the new devices meet the stringent jitter and phase noise requirements of applications and standards such as 10G Ethernet, enterprise storage SAS and SATA, PCI Express Gen 1/2/3, XAUI, SRIO, stringent PHY reference clocks and the newest generations of high-end FPGAs all while operating at about half the core power of competing devices.
One can see that if the phase jitter is kept the same (in radians) for different frequencies, the time jitter will scale linearly proportional to approximately 1/[F.
The question then arises as to how to manipulate the division ratio of the divider in order to reduce the low frequency phase jitter that it produces on its output.
IDT s 8T49N28x UFT family is the industry s first single-chip programmable solution capable of generating eight different output frequencies with less than 300 fs RMS phase jitter over the standard 12kHz to 20MHz integration range.
The 5 mm x 7 mm SMT hermetically sealed RoHS 6/6-complaint TCXO exhibits phase jitter from 12 kHz to 20 MHz and start up of 2 ms.
Phase jitter performance is better than [less than] 6 ps rms for frequencies greater than 12 MHz.
With 300 femtosecond RMS phase jitter and 10 ppm frequency stability, these are the highest performance programmable silicon-based oscillators to enter production.
today introduced a new high-performance synthesizer with ultra-low phase jitter for reducing bit error rates in today s serial data communications systems.
The LVE-PECL crystal oscillator (XO) RFX250 and LVE-PECL voltage controlled crystal oscillator (VCXO) RFV250 feature phase jitter of <0.
Phase jitter causes transmit and receive timing errors and irregular sampling that results in distance, quantity, and bit errors.
The CY2Dx15xx family features additive RMS phase jitter as low as 60fs while delivering propagation delays as low as 480ps.
This VPLB434J3E family of selectable output VGXOs meets SONET phase jitter requirements and is available with stabilities of [+ or -]20 ppm.