Oscillators, clocks and PLLs

Oscillators are used in analog as well as in digital designs. They work as clocks for digital designs or local oscillators (LO) to reach the target RF frequency through up- or downconversion.

Oscillators have various different topologies, ranging from crystal synthesizer based PLL designs to DDS techniques. Either way, the output signal have to be characterized and tested to make sure the device or module meets the design specifications for clock accuracy, signal purity and stability.

Rohde & Schwarz provides solutions to test any oscillator using Oscilloscopes, Spectrum Analyzers, Phase Noise Analyzer and VCO Testers.

T&M Solutions

Verifying the true jitter performance of clocks in high-speed digital designs

As the data rates in high-speed digital designs increase, the limits for overall system jitter become tighter.

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Verifying additive phase noise and jitter attenuation of PLLs in high-speed digital designs

Increasing data rates in high-speed digital designs and wireless communications require SerDes PLLs and clock synthesizers with low additive phase noise and high jitter attenuation. Modern designs often follow a two-stage architecture, consisting of a jitter-attenuator and a frequency-synthesizer stage. Due to their high phase noise sensitivity, phase noise analyzers are the instruments of choice for these tests. To stimulate the PLL, an additional signal source with ultra low phase noise is required.

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A 1 MHz to 50 GHz Direct Down-Conversion Phase Noise Analyzer with Cross-Correlation

A new phase noise test instrument covers the frequency range from 1 MHz to 50 GHz with direct down-conversion analog I/Q mixers and baseband signal sampling. The traditional PLL has been replaced by a digital FM demodulator for phase detection and frequency tracking. An additional AM demodulator enables concurrent measurement of phase and amplitude noise.

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Verifying the clock source

A clear clock signal is essential to the performance of every analog and digital circuit desgin. Learn how to verify your clock signal by taking advantage of fast and precise jitter performance measurements (with R&S®FSWP phase noise analyzer)

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Comparison of jitter measurements in the time and frequency domain

When analyzing the robustness of data transmission systems, jitter is a key indicator. It is recommended to use jitter measurement instruments for both the time and frequency domain in order to differentiate between fast and slow moving artifacts.

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When you need an ideal clock source

Today’s digital designs and data converters with high rates require clean clocks with minimal jitter. Modern digital designs and data converters can only work as well as the applied clock source allows. See how to get the best performance by using a state-of-the-art clock source.

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Related Product Groups

Signal & Spectrum Analyzers

Choose from the wide range of Rohde & Schwarz signal and spectrum analyzers that set standards in performance, functionality and usability.

Products

Oscilloscpes

Opt for powerful Rohde & Schwarz oscilloscopes that excel in usability and functionality analyzing time domain, mixed signals, serial buses and frequency.

Products

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