ADRF6655ACPZ-R7 datasheet(34/44 Pages) AD

34 / 44 page

ADRF6655

Rev. 0 | Page 34 of 44

CHARACTERIZATION SETUPS

Figure 78 to Figure 80 show the general characterization bench

setups used extensively for the ADRF6655. The setup shown in

Figure 78 was used to do the bulk of the testing. An automated

Agilent VEE program was used to control the equipment over the

IEEE bus. This setup was used to measure gain, IP1dB, OP1dB,

IIP2, IIP3, OIP2, OIP3, LO-to-IF and LO-to-RF leakage, LO

amplitude, and supply current. The ADRF6655 was characterized

on an upconversion and downconversion evaluation board

configured for each conversion as described in the Input Matching

section and the Output Matching and Biasing section. For all

measurements of the ADRF6655, the loss of the RF input balun

was de-embedded.

To do phase noise and reference spurs measurements, see the

phase noise setup used in Figure 79. Phase noise measurements

were done on a downconversion board looking at the output at

different offsets.

Figure 80 shows the setup used to make the noise figure

measurements with no blocker present, and Figure 81 shows

the setup for making the noise figure measurements under

blocking conditions. Note that attention must be given to the

measurement setup. The RF blocker signal must be filtered

through a band-pass filter to prevent noise (which increases

when output power is increased) from contributing at the desired

RF frequency. At least 30 dB attenuation is needed at the desired

RF and image frequencies. For example, to generate a blocker

signal at the IF output of 205 MHz, the blocker signal generator

is set at 995 MHz, and the part is programmed to generate a LO

frequency of 1200 MHz that results in an output signal of 205 MHz.

This signal must be filtered out through a band reject filter on

the output so that the noise figure can be measured at 200 MHz,

which corresponds to the output frequency for LO = 1200 MHz

and RF input = 1000 MHz.

ADRF6655ACPZ-R7 Datasheet(PDF) 34 Page - Analog Devices