ADL5382ACPZ-R7 datasheet(21/28 Pages) AD

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ADL5382

Rev. 0 | Page 21 of 28

CHARACTERIZATION SETUPS

Figure 57 to Figure 59 show the general characterization bench

setups used extensively for the ADL5382. The setup shown in

Figure 59 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 ADL5382 characterization

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

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

ended conversion, which presented a 450 Ω differential load to

each baseband port, when interfaced with 50 Ω test equipment.

For all measurements of the ADL5382, the loss of the RF input

balun (the M/A-COM ETC1-1-13 was used on RF input during

characterization) was de-embedded.

The two setups shown in Figure 57 and Figure 58 were used for

making NF measurements. Figure 57 shows the setup for

measuring NF with no blocker signal applied while Figure 58

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 a 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 ADL5382. At least

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

For example, assume a 915 MHz signal applied to the LO inputs of

the ADL5382. To obtain a 15 MHz output blocker signal, the RF

blocker generator is set to 930 MHz and the filters tuned such

that there is at least 30 dB of attenuation from the generator at

both the desired RF frequency (925 MHz) and the image RF

frequency (905 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

ADL5382

CHAR BOARD

GND

VPOS

LOW-PASS

FILTER

INPUT

50Ω

Figure 57. General Noise Figure Measurement Setup

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