AN636A input impedance versus frequency chart

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AN636A input impedance versus frequency chart

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mattfindlow
Contributor II

AN636A data sheet shows RF input resistance 700Ohm and RF input capacitance 3.5pf at 240Mhz. Can I assume these are in parallel. How is this information useful when trying to match at other frequencies? Is there an input impedance versus frequency chart some where for the AN636?  I have seen them for the 605A and 606A.  I want impedance for 120Mhz. Thanks

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  • RF

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LPP
NXP TechSupport
NXP TechSupport

RFi single-ended input capacitance of SA636 is provided relative to GND. It is parallel to input resistance.

Matching circuit in Figure 15 is suitable for 120MHz (for good RLI about -20dB).

Have a great day,
Pavel
NXP TIC

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