Linear Technology’s new LTC6945 is a 6 GHz integer-N frequency synthesiser with -226 dBc/Hz normalised closed-loop in-band phase noise, -274 dBc/Hz normalised in-band 1/f noise, a wideband phase noise floor of -157 dBc/Hz and -102 dBc spurious output. In a typical 900 MHz application, these performance attributes enable a closed-loop phase noise of
-100 dBc/Hz at 1 kHz offset.
The device is designed to work in conjunction with an external low-noise VCO up to 6 GHz. In addition, it has an on-chip output divider that is programmable from 1 through 6 to extend the tuning frequency coverage to as low as 350 MHz.
The LTC6945 comprises a low-noise reference buffer, a reference divider, phase-frequency detector (PFD) with phase-locked indicator, a low-noise programmable charge pump and an integer feedback divider to attain very low-noise PLL operation. The on-chip, SPI-compatible bidirectional serial port allows frequency tuning and control, and readback of the register and loop status information.
The low phase noise and spurious capabilities of the LTC6945 are targeted at 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 PC-based PLLWizard design software is available to facilitate interactive control and to interface with the LTC6945’s evaluation board. Designers can perform simulations and optimisation with the software and then interactively verify their designs on the actual demonstration circuit. PLLWizard is available for download free of charge at www.linear.com/PLLWizard.
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