Bandwidth of AD8000 in non-inverting configuration

I have a AD8000 SOIC package in noninverting configuration (Fig. 50 datasheet). Rf=439 ohms, Rs=0ohms, RL is open circuit, Rg = open circuit, 0.1 uF decoupling caps at supply pins. I am using +/-5V supply. I am interested in the performance at 1.25 GHz. I use -20 dBm input and get -26 dBm output at 1.25 GHz. I don't think this matches the performance shown in Fig.5 of datasheet. Can you suggest what I could change to make it work as expected?

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  • I added 10 uF decoupling caps. at the V+ and V- terminals and also made the feedback close to 431 ohms. Now I get a 3 dB loss at 1.25 GHz (small signal, -10 dB input), but table 5 in datasheet claims a 3 dB bandwidth of 1.58 GHz. The numbers I get match Figure 5. Why does table 5 not match figure 5? What is the difference from?

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  • I added 10 uF decoupling caps. at the V+ and V- terminals and also made the feedback close to 431 ohms. Now I get a 3 dB loss at 1.25 GHz (small signal, -10 dB input), but table 5 in datasheet claims a 3 dB bandwidth of 1.58 GHz. The numbers I get match Figure 5. Why does table 5 not match figure 5? What is the difference from?

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