Linear Technology DC426B Quick Start Quide page 2

LT5511 Upconverting Mixer Single-Tone Measurements for 1900MHz Band.
1. Connect all test equipment as shown in Figure 2.
2. Set the Power Supply output voltage to 5V, and set the current limit to 100mA.
3. Set the dipswitch SW1 (Enable) to 1. Mixer is in ENABLE mode.
4. Set the Signal Generator #1 to provide a 1950MHz, -10dBm, CW signal to the demo board
LOin port.
5. Set the Signal Generator #2 to provide a 50MHz, -5dBm, CW signal to the demo board IFin
port.
6. Set the Spectrum Analyzer's center frequency to 1900MHz. Perform mixer conversion gain,
and 1dB compression measurements.
7. Set the Spectrum Analyzer's center frequency to 1950MHz. Perform mixer LO to RF
suppression measurement.
8. Set the Spectrum Analyzer's center frequency to 1850MHz and 2050MHz. Perform input 2
order distortion measurement. (IIP2 = 2 * P1 – P2 – Gc, where P1 is the power level of the
desired output at 1900MHz, P2 is the largest 2
2050MHz, and Gc is conversion gain. P1 and P2 are in units of dBm, and Gc is in dB.)
SIGNAL
GENERATOR 1
SIGNAL
GENERATOR 2
Figure 2. Test Set-Up for Mixer Single-Tone Measurements
nd
order product at either 1850MHz or
nd
SPECTRUM
ANALYZER
POWER SUPPLY
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