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Multiple PLL combination reference design for <40-fs jitter (100-Hz to 100-MHz)
TIDA-01346
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Key Document
- Multiple PLL Combination Reference Design for < 40-fs Jitter (100 Hz to 100 MHz) (Rev. A)
(PDF 1210 KB)
13 Jun 2017
Description
The TIDA-01346 design uses two LMX2594 synthesizers in combination to produce lower noise than is possible with just one. By combining the output of two synthesizers that are in phase, a theoretical 3 dB phase noise benefit is possible due to the output power being 6 dB higher while the noise power is only 3 dB higher. The LMX2594 is an ideal synthesizer for this application as it has a SYNC feature that allows it to have deterministic and repeatable phase as well as a programmable phase that can be used to correct for any phase error due to trace mismatches or any other factors.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
