AD8366ACPZ-R7 datasheet(19/28 Pages) AD

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AD8366

Rev. A | Page 19 of 28

LOW FREQUENCY IMD3 PERFORMANCE

To measure the IMD3 data at low frequencies, wideband

transformer baluns from North Hills Signal Processing Corp.

were used, specifically the 0301BB and the 0520BB. Figure 55

shows the IMD3 performance vs. frequency for a 2 V p-p

composite output. The IMD3 performance was also measured

for the combined ADL5380 and AD8366 system, as shown in

Figure 56, with an FFT spectrum analyzer. An FFT spectrum

analyzer works very similar to a typical ADC, the input signal

is digitized at a high sampling rate that is then passed through an

antialiasing filter. The resulting signal is transformed to the

frequency domain using fast Fourier transforms (FFT).

The single-ended RF signal from the source generator is converted

to a differential signal using a balun that gets demodulated and

down converted to differential IF signals through the ADL5380.

This differential IF signal drives the AD8366, thus eliminating

the need for low frequency baluns. Figure 54 shows the IMD3

performance vs. frequency over the 500 kHz to 5 MHz range

for minimum and maximum gain code setting on the AD8366.

During the measurements, the output was set to 2 V p-p composite.

–90

–80

–70

–60

–50

–40

–30

–20

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

FREQUENCY (MHz)

GC63

GC0

Figure 54. System IMD3 vs. Frequency, 2 V p-p Composite at

the Output of the AD8366

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

GAIN CODE

FREQUENCY = 1MHz

FREQUENCY = 3MHz

Figure 55. OIP3 on Low Frequency, 2 V p-p Composite

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