Integer-N frequency synthesizer integrates VCO, -103-dB spurious output

摘要

Linear Technology's new LTC6946 integer-N fre-quency synthesizer inte-grates a VCO (voltage-con-trolled oscillator) and delivers -226-dBc (decibels referenced to the carrier)/Hz normalized, closed-loop, in-band phase noise; -274-dBc/Hz normalized, in-band flicker noise; and -103-dB spurious output. In a typical 900-MHz system, these features enable the device to achieve a closed-loop phase noise of -100 dBc/Hz at a 1 -kHz offset.