Analog Frequency Multiplier
PL660 and PL663 XO Families
EXTERNAL COMPONENT VALUES
INDUCTOR VALUE OPTIMIZATION
The required inductor value(s) for the best performance depends on the operating frequency, and the board layout
specifications. The listed values in this datasheet are based on the calculated parasitic values from PhaseLink’s
evaluation board design. These inductor values provide the user with a starting point to determine the optimum
inductor values. Additional fine-tuning may be required to determine the optimal solution.
To assist with the inductor value optimization, PhaseLink has developed the “AFM Tuning Assistant” software. You
can download this software from PhaseLink’s web site (www.phaselink.com). The software consists of two
worksheets. The first worksheet (named L2) is used to fine-tune the ‘L2’ inductor value, and the second worksheet
(named L4) is used for fine tuning of the ‘L4’ (used in 4x AFMs only) inductor value.
For those designs using PhaseLink’s recommended board layout, you can use the “AFM Tuning Assistant” to
determine the optimum values for the required inductors. This software is developed based on the parasitic
information from PhaseLink’s board layout and can be used to determine the required inductor and parallel
capacitor (see LWB1 and Cstray parameters) values. For those employing a different board layout in their design,
we recommend to use the parasitic information of their board layout to calculate the optimized inductor values.
Please use the following fine tuning procedure:
Figure 5: Diagram Representation of the Related System Inductance and Capacitance
DIE SIDE
- Cinternal = Based on AFM Device
- Cpad = 2.0 pF, Bond pad and its ESD circuitry
- C11 = 0.4 pF, The following amplifier stage
PCB side
- LWB1 = 2 nH, (2 places), Stray inductance
- Cstray = 1.0 pF, Stray capacitance
- L2X (L4X) = 2x or 4x inductor
- C2X (C4X) = range (0.1 to 2.7), Fine tune inductor if
used
47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990, FAX (510) 492-0991
www.phaselink.com
Rev. 3/20/07 Page 5
PLL [ PHASELINK CORPORATION ]
