ADL5960ACCZ-R2 datasheet(27/32 Pages) AD

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Data Sheet

ADL5960

APPLICATIONS INFORMATION

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Rev. A | 27 of 32

Table 11. IF Amplifier Gain vs. FGAIN and RGAIN Settings (Continued)

FGAIN, RGAIN

IF Gain (dB)

24 to 29

30 to 35

36 to 41

42 to 47

48 to 53

…

For best overall measurement accuracy, large-signal non-linearity

of the signal chain must be minimized. At FGAIN (or RGAIN)

values greater than 0, the ADL5960 exhibits a slight large-signal

gain expansion characteristic, up to 1 dB. This can introduce small

errors in the measured transmission or reflection coefficients. One

way to mitigate a non-linearity error is to calibrate at lower input

power levels, ≤0 dBm for example. Another technique to mitigate a

non-linearity error is by using a polynomial curve fit and applying a

correction after ADC conversion in the digital domain. For a solution

involving external hardware, set FGAIN (or RGAIN) = 0 and add a

high-precision ADC driver, such as the ADA4945.

Finally, the adjustable output common-mode level, up to 8 V p-p

output-voltage swing and up to 200 mA current drive capability,

provide enough flexibility to interface with a broad range of suitable

Σ-Δ, successive approximation register (SAR), or pipeline-based

ADCs with sample rates up to several hundred MHz.

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