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Ultralow noise synthesizer suppresses system noise

21 Dec 2011

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Linear Technology has rolled out the LTC6945, a high performance 6GHz integer-N frequency synthesizer, which features -226dBc/Hz normalized closed-loop in-band phase noise, -274dBc/Hz normalized in-band 1/f noise, wideband phase noise floor of -157dBc/Hz and -102dBc spurious output. In a typical 900MHz application, these attributes enable a closed-loop phase noise of -100dBc/Hz at 1kHz offset. The LTC6945 has an on-chip output divider that is programmable from 1 through 6 to extend the tuning frequency coverage to as low as 350MHz.

The synthesizer comprises a low noise reference buffer, reference divider, phase-frequency detector (PFD) with phase-locked indicator, ultralow noise programmable charge pump and integer feedback divider to attain very low noise PLL operation. The on-chip SPI-compatible bidirectional serial port allows frequency tuning and control, and read back of the register and loop status information.

The low phase noise and spurious capabilities of the LTC6945 enhance the performance of RF and wireless equipment of all types, including multiband base stations supporting LTE, W-CDMA, UMTS, CDMA, multicarrier GSM and WiMAX standards. Its wide frequency range also supports point-to-point broadband wireless access, military, avionics and high performance test and measurement applications.

The PLLWizard comprehensive PC-based design tool software is available to facilitate interactive control, and to interface with the LTC6945's evaluation board. Designers can perform simulations and optimization with the PLLWizard software, and interactively verify their designs on the actual demonstration circuit.

The LTC6945 has a full case temperature range of -40°C to 105°C, and is now available in a 4x5, 28-lead plastic QFN package. Pricing starts at $4.95 each in 1,000-piece quantities.

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