QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 933A

HF/VHF/UHF DOWNCONVERTING MIXER

3

NOTE:

Make sure that the power is not applied to the

EN pin before it is applied to the Vcc pin. The volt-

age on the EN pin must never exceed the voltage

on the Vcc pin +0.3V.

6.

Apply RF and LO input signals to perform AC

measurements.

NOTE:

Do not exceed the absolute maximum RF and

LO input power.

7.

Set the LO signal generator (#1) to provide a

150MHz, -5dBm, CW signal to the demo board LO

input port.

8.

Set the RF signal generators (#2 and #3) to provide

two –10dBm CW signals to the demo board RF in-

put port—one at 139.9MHz, and the other at

140.1MHz.

9.

Set the Spectrum Analyzer’s frequency range to

capture the 10MHz IF output. Sufficient spectrum

analyzer input attenuation should be used to avoid

saturating the instrument.

10.

Conversion gain and Input 3

rd order intercept can

be measured:

a.

Gc = P1 – Pin

b.

IIP3 = (P1 – P3) / 2 + Pin

Where P1 is the power level of the fundamental

output tone at 9.9MHz or at 10.1MHz, P3 is the 3

rd

order product at 9.7MHz or at 10.3MHz, and Pin is

the input power (in this case, -10dBm). All units

are in dBm.

11.

Measure RF to LO isolation, LO leakages, and Input

1dB compression.

12.

Single-Sideband Noise Figure can be measured on a

noise figure meter. Refer to noise figure meter man-

ual for instructions. Be sure to use a high quality sig-

nal generator and a band-pass filter on the LO input.

A band-pass filter on the RF input port is required for

image suppression.

Figure 1. Proper Measurement Equipment Setup