ADL5387ACPZ-R71 datasheet(21/28 Pages) AD

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ADL5387

Rev. 0 | Page 21 of 28

CHARACTERIZATION SETUPS

Figure 60 to Figure 62 show the general characterization bench

setups used extensively for the ADL5387. The setup shown in

Figure 62 was used to do the bulk of the testing and used sinusoidal

signals on both the LO and RF inputs. An automated Agilent-

VEE program was used to control the equipment over the IEEE

bus. This setup was used to measure gain, IP1dB, IIP2, IIP3, I/Q

gain match, and quadrature error. The ADL5387 characterization

board had a 9-to-1 impedance transformer on each of the

differential baseband ports to do the differential-to-single-

ended conversion.

The two setups shown in Figure 60 and Figure 61 were used

for making NF measurements. Figure 60 shows the setup for

measuring NF with no blocker signal applied while Figure 61

was used to measure NF in the presence of a blocker. For both

setups, the noise was measured at a baseband frequency of

10 MHz. For the case where a blocker was applied, the output

blocker was at 15 MHz baseband frequency. Note that great care

must be taken when measuring NF in the presence of a blocker.

The RF blocker generator must be filtered to prevent its noise

(which increases with increasing generator output power) from

swamping the noise contribution of the ADL5387. At least

30 dB of attention at the RF and image frequencies is desired.

For example, with a 2xLO of 1848 MHz applied to the ADL5387,

the internal 1xLO is 924 MHz. To obtain a 15 MHz output

blocker signal, the RF blocker generator is set to 939 MHz and

the filters tuned such that there is at least 30 dB of attenuation

from the generator at both the desired RF frequency (934 MHz)

and the image RF frequency (914 MHz). Finally, the blocker

must be removed from the output (by the 10 MHz low-pass

filter) to prevent the blocker from swamping the analyzer.

HP 6235A

POWER SUPPLY

AGILENT 8665B

SIGNAL GENERATOR

IEEE

PC CONTROLLER

CONTROL

SNS

OUTPUT

AGILENT N8974A

NOISE FIGURE ANALYZER

ADL5387

CHAR BOARD

GND

VPOS

LOW-PASS

FILTER

INPUT

50Ω

Figure 60. General Noise Figure Measurement Setup

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