Welcome to this installment of EE Classroom on 5G Synchronization!
For 5G, timing may not be exactly everything, but it is a big thing. As build-out continues network operations must address a variety of challenges including successful spectrum management, preparation of transport and synchronization architectures, and reliance on existing and next-gen GNSS receivers – and solutions to their potential outages. High-reliability timing products become even more critical when you factor in the phase time demands of Time Division Duplex (TDD) and the need for high accuracy within a few hundred nanoseconds.
In this classroom, we present several tutorials on the test and measurement techniques associated with oscillators, and other timing products. Need a bit of a refresher or an intro to quartz crystals, oscillators, resonators, and RTCs? We’ve got that, too, as well as a check list of the critical parameters of a clock. After making your way through those tutorials, check out our sponsors various documents addressing solutions to 5G synchronization challenges.
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5G Synchronization Classroom Sponsored by
Test & Measurement • PLL
Understanding and measuring optoelectronic oscillators
What is Phase Locked Loop (PLL)?
The ups and downs of oscillators in test equipment
Basics of LC oscillators and their measurement
PLLs use a negative feedback circuit to match the phase of the frequency of another signal and synchronize the phase of the PLL’s output to the input signal’s frequency.
The amount of capacitance and inductance of capacitors and inductors determine both the resonant frequency and the sharpness of the response curve (known as Q).
Demanding applications require oscillators having high spectral purity, which can only be achieved by implementing optical components.
To support oscillations, the phase shift caused by the amplifier and feedback network must be zero. This criterion is unfulfilled at all but one frequency.
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