APPLICATION NOTE 2870

MAX2605/MAX2606/MAX2608/MAX2609 VCO Phase Noise Measurements


Abstract: Phase noise performance is measured and presented for Maxim's IF voltage-controlled oscillators (VCOs). The phase noise of the VCOs tested rolled-off at 20dB/decade between 10kHz and 1MHz offset. All measurements were taken with Maxim Evaluation kits. VCC = +2.75V, TA = +25°C, and VTUNE = 1.4V.

The MAX2605-MAX2609 are compact, high-performance intermediate-frequency (IF) voltage-controlled-oscillators (VCOs) designed specifically for demanding portable wireless communication systems. They combine monolithic construction with low-noise, low-power operation in a tiny 6-pin SOT23 package. These low-noise VCOs feature an on-chip varactor and feedback capacitors that eliminate the need for external tuning elements, making the MAX2605-MAX2609 ideal for portable systems.

This application note describes phase-noise measurements performed on these parts, using Maxim Evaluation kits. VCC = +2.75V, TA = +25°C, and VTUNE = 1.4V.

Figure 1.
Figure 1.

Figure 2.
Figure 2.

Figure 3.
Figure 3.

Figure 4.
Figure 4.

Note that in each graph presented, the phase noise follows the expect 20dB per decade roll-off. The MAX2607 was not measured for this application note, so a graph was not prepared. Expect the phase noise of the MAX2607 to follow the same roll-off exhibited by all the VCOs in this family.

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APP 2870:
APPLICATION NOTE 2870,AN2870, AN 2870, APP2870, Appnote2870, Appnote 2870