MAX2605 / MAX2606 / MAX2608 / MAX2609 VCO phase noise measurement
Abstract: Maxim's IF voltage controlled oscillator (VCO) phase noise test performance. The phase noise of the VCO rolls off between 10kHz and 1MHz at 20dB / decade. All measurements are made on the Maxim evaluation board. Where VCC = + 2.75V, TA = + 25 ° C, VTUNE = 1.4V.
The MAX2605-MAX2609 are compact, high-performance intermediate-frequency (IF) voltage-controlled oscillators (VCOs) designed specifically for demanding handheld wireless communication systems. These monolithic VCOs are packaged in a miniature 6-lead SOT23, which has the advantages of low noise and low power consumption. The low-noise VCO has an on-chip integrated varactor diode and feedback capacitor, eliminating the need for external tuning components, which makes the MAX2605-MAX2609 particularly suitable for handheld system applications.
This application note describes using the Maxim evaluation board to test the phase noise performance of these devices. VCC = + 2.75V, TA = + 25 ° C, VTUNE = 1.4V. 
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Note that the phase noise in each figure follows the expected roll-off characteristic of 20dB / octave. This application note does not test the MAX2607, and does not provide a diagram of its phase noise characteristics. But the phase noise of the MAX2607 follows the same roll-off characteristics exhibited by all VCOs in this series.
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