Few questions on your circuit.
What is you input voltage level? I need to know if the amplifier output is still in the specified output swing. With your current circuit, VCM=0.9V and output swing limited to + 3.8 V, the input should be between…
I'd like to simulate diffrential amp(ADA4938-2) by using ADIsimPE.
So I imported ADA4938-2's spice model and define the symbol,
ADIsimPE doesn't show the correct symbol.
How do I define the correct symbol?
By the way ... I've paid an attention to the caption of figure 47 ... " Figure 47. Differential Input Configuration Using the ADA4938-2 " While the OpAmp shown is ADA4930-2.
I'm planning to use the AD9255 single 14 bit ADC with DC coupled input signals in the dc - 20 MHz range.
Because of the DC coupled requirement I am looking at ADC driver amplifiers instead of a transformer.
The AD9255 web page recommends the ADA4937…
AD8138可以作为 ADC driver，但是其-3dB带宽只有320MHz，所以最好采用ADA4938-2
I use the ADA4938 to Drive the ADC(AD9629), the pin Vocm connected to pin VCM of AD9629, and the output voltage of pin VCM is MID AVDD Supply (0.9V).
The schematic is shown below, and the gain of ADA4938 should be 0.5 in theory.
ADIsimPE run on SIMetrix…