R&S®SMW100A - When you need an ideal clock source · Excellent SSB phase noise: –152 dBc (1 Hz)...
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Application Card | Version 01.00 When you need an ideal clock source Today’s digital designs and high-speed data converters require clean clocks with minimal jitter. When you need an ideal clock source Your task Modern digital designs and data converters can only work as well as the clock source allows. To bring out the best performance of a data converter design, an ideal clock source is required to minimize any influence on the signal purity of a digital-to-analog converter (DAC) output or the sampled data of an analog-to-digital (ADC) converter. As clock rates increase, the requirements for signal quality remain or become even more demanding. The bottom line is that you need a flexible clock source that can provide the signals needed for today’s and tomorrow’s designs with minimal jitter and noise as well as best spectral purity. T&M solution The R&S®SMA100B produces cleanest signals, which are ideal as a clock source. With an RF output frequency up to 20 GHz, it covers even the latest and next generation DACs and ADCs with steadily increasing clock rates: ❙ Frequency coverage: 8 kHz to 3/6/12.75/20 GHz ❙ Excellent SSB phase noise: –152 dBc (1 Hz) at 1 GHz, 20 kHz offset ❙ Minimal jitter: 17.5 fs at 1 GHz (1 Hz to 10 MHz bandwidth) ❙ Virtually no wideband noise: –162 dBc at 10 GHz, 30 MHz offset Lowest wideband noise in particular is of interest for use as a clock source. In applications such as analog-to-digital converter (ADC) testing, the wideband noise of the clock signal can be accumulated multiple times. This causes a degradation of the total signal to noise ratio and therefore needs special attention. A flexible clock source needs to provide the best RF per- formance across the entire frequency range since even high-speed devices are characterized and specified at lower frequencies. The R&S®SMA100B uses a direct con- cept all the way down to 8 kHz, ensuring the best RF per- formance across the entire range. In the past, filters were often required in order to suppress harmonics and subharmonics. Such filters can be elimi- nated thanks to the R&S®SMA100B generator’s built-in harmonic filter and excellent subharmonic suppression: ❙ Harmonics suppression of 70 dB over a wide frequency range ❙ Nonharmonics below –110 dBc at 1 GHz Sometimes test setups require more cabling than is ideal, resulting in high attenuation. The higher the clock frequencies, the more important this becomes. The R&S®SMA100B offers enough reserves to compensate for losses, making external amplifiers unnecessary: ❙ Up to 38 dBm with the 6 GHz instrument ❙ Up to 32 dBm in the microwave frequency range with the 20 GHz instrument The R&S®SMA100B provides extremely clean clock signals.
Transcript of R&S®SMW100A - When you need an ideal clock source · Excellent SSB phase noise: –152 dBc (1 Hz)...
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Today’s digital designs and high-speed data converters require clean clocks with minimal jitter.
When you need an ideal clock source
Your taskModern digital designs and data converters can only work as well as the clock source allows. To bring out the best performance of a data converter design, an ideal clock source is required to minimize any influence on the signal purity of a digital-to-analog converter (DAC) output or the sampled data of an analog-to-digital (ADC) converter. As clock rates increase, the requirements for signal quality remain or become even more demanding. The bottom line is that you need a flexible clock source that can provide the signals needed for today’s and tomorrow’s designs with minimal jitter and noise as well as best spectral purity.
T&M solutionThe R&S®SMA100B produces cleanest signals, which are ideal as a clock source. With an RF output frequency up to 20 GHz, it covers even the latest and next generation DACs and ADCs with steadily increasing clock rates: ❙ Frequency coverage: 8 kHz to 3/6/12.75/20 GHz ❙ Excellent SSB phase noise: –152 dBc (1 Hz) at 1 GHz, 20 kHz offset
❙ Minimal jitter: 17.5 fs at 1 GHz (1 Hz to 10 MHz bandwidth)
❙ Virtually no wideband noise: –162 dBc at 10 GHz, 30 MHz offset
Lowest wideband noise in particular is of interest for use as a clock source. In applications such as analog-to-digital converter (ADC) testing, the wideband noise of the clock signal can be accumulated multiple times. This causes a degradation of the total signal to noise ratio and therefore needs special attention.
A flexible clock source needs to provide the best RF per-formance across the entire frequency range since even high-speed devices are characterized and specified at lower frequencies. The R&S®SMA100B uses a direct con-cept all the way down to 8 kHz, ensuring the best RF per-formance across the entire range.
In the past, filters were often required in order to suppress harmonics and subharmonics. Such filters can be elimi-nated thanks to the R&S®SMA100B generator’s built-in harmonic filter and excellent subharmonic suppression: ❙ Harmonics suppression of 70 dB over a wide frequency range
❙ Nonharmonics below –110 dBc at 1 GHz
Sometimes test setups require more cabling than is ideal, resulting in high attenuation. The higher the clock frequencies, the more important this becomes. The R&S®SMA100B offers enough reserves to compensate for losses, making external amplifiers unnecessary: ❙ Up to 38 dBm with the 6 GHz instrument ❙ Up to 32 dBm in the microwave frequency range with the 20 GHz instrument
The R&S®SMA100B provides extremely clean clock signals.
SMA100B_Ideal-clock-source_ac_5215-3940-92_v0100.indd 1 01.08.2017 12:49:20
Compact setup for clock signals up to 6 GHz
Analog in
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ADC under test
Compact ADC test setup with a single R&S®SMA100B with an integrated second source.
Measured SSB phase noise at the RF output of the R&S®SMA100B with R&S®SMAB-B711 option
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PD 5215.3940.92 | Version 01.00 | August 2017 (ch)
R&S®SMA100B; When you need an ideal clock source
Data without tolerance limits is not binding | Subject to change
© 2017 Rohde & Schwarz GmbH & Co. KG | 81671 Munich, Germany 5215
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Thanks to the unique electronic attenuator, the instrument offers high level agility without any wear and tear.
A specialty of the R&S®SMA100B is the ability to include an optional second very pure source up to 6 GHz in the same housing (R&S®SMAB-B29 option): ❙ SSB phase noise: –145 dBc (1 Hz) at 1 GHz, 20 kHz offset ❙ Lowest wideband noise: –166 dBc at 1 GHz, 10 MHz offset
The frequency and level are completely independent of the RF output. This comes in very handy when testing ADCs since one instrument supplies both the RF input signal and the clock signal. The output can be a standard sine wave or a square wave. To allow direct connection to the DUT, the output supports single and differential format with the ability to add a DC offset. The second source is useful in many ways, because it offers flexible level and frequency at its output.
It is easy to upgrade from your current clock source solu-tion. The R&S®SMA100B supports remote programming emulation of many common platforms of various vendors. With its compact 2 HU form factor, the R&S®SMA100B conveniently fits into any open spot.
See alsowww.rohde-schwarz.com/product/sma100b
SMA100B_Ideal-clock-source_ac_5215-3940-92_v0100.indd 2 01.08.2017 12:49:21
