Linear Technology DC651A User manual

DC651A DEMO BOARD QUICK START GUIDE

Description:

The DC651A demo circuit board is intended to demonstrate the capabilities of the LT5522 high-

signal-level downconverting mixer IC for cable and CATV infrastructure applications.

The LT5522 (Figure 1) is a broadband high signal level active mixer optimized for high linearity

downconverter applications including cable (CATV) and wireless infrastructure. The IC includes a

high-speed differential LO buffer amplifier driving a double-balanced mixer. The LO buffer is

internally 50ohm-matched for wideband, single-ended operation with no external components.

The LT5522 IC’s RF input port incorporates an integrated transformer and is internally matched to

50ohms over the 1.2GHz to 2.3GHz frequency range. The RF input match can be shifted down to

600MHz, or up to 2.7GHz, with a single shunt capacitor or inductor, respectively. The high level of

integration minimizes the total solution cost, board space and system-level variation.

The LT5522 delivers high performance and small size without excessive power consumption.

The DC651A demo board allows evaluation of the LT5522 downconverting mixer IC for cable

infrastructure applications. Its RF input is optimized for 1150MHz. The IF output frequency range

spans 50MHz to 1050MHz. The corresponding range of LO frequencies is 1200MHz to 2200MHz.

Figure 1. LT5522 IC Block Diagram

LT5522 Downconverting Mixer Single-Tone Measurements for CATV Band.

1. Connect all test equipment as shown in Figure 2.

2. Set the Power Supply voltage to 5V, and set the current limit to 100mA.

3. Connect TP1 (EN) to the 5V power supply; the mixer is enabled (on).

4. Set the Signal Generator #1 to provide a -5dBm CW signal, at the desired LO frequency

between 1200MHz and 2200MHz (e.g., 1650MHz), to the demo board LOin port.

5. Set the Signal Generator #2 to provide a 1150MHz, -12 dBm CW signal to the demo board

RFin port.

6. Set the Spectrum Analyzer center frequency to the IF output frequency at fLO-fRF

(e.g., 500MHz). Perform mixer conversion gain, and 1dB compression measurements.

7. Set the Spectrum Analyzer center frequency to the LO frequency (e.g., 1650MHz). Perform

mixer LO to IF leakage measurement.

SPECTRUM

ANALYZER

SIGNAL

GENERATOR 1

SIGNAL

GENERATOR 2

POWER SUPPLY

Figure 2. Test Set-Up for Mixer Single-Tone Measurements.

LT5522 Downconverting Mixer Two-Tone Measurements for CATV Band.

1. Connect all test equipment as shown in Figure 3.

1). Use high quality signal generators with low harmonic output for this measurement.

Otherwise, low-pass filters should be used to suppress harmonics.

2). A high quality combiner that provides 50ohm termination on all ports and has good

port-to port isolation should be used.

3). The two 3dB attenuators on the inputs of the combiner are used to further improve

source isolation.

2. Set the Power Supply voltage to 5V, and set the current limit to 100mA.

3. Connect TP1 (EN) to the 5V power supply. Mixer is enabled (on).

4. Set the Signal Generator #1 to provide a -5dBm CW signal, at the desired LO frequency

between 1200MHz and 2200MHz (e.g. 1650MHz), to the demo board LOin port.

5. Set the Signal Generator #2 and #3 to provide two -12dBm CW signals to the demo board

RFin port—one at 1150MHz, and the other at 1151MHz.

6. Set the Spectrum Analyzer center frequency to the IF output frequency at fLO-fRF. Perform

input 3rd order distortion measurement (i.e. IIP3 = P1+ (P1– P3) / 2 – Gc, where P1is the

lowest power level of the two desired output tones at either 499MHz or 500MHz, P3is the

largest 3rd order product at either 498MHz or 501MHz, and Gc is conversion gain. P1and

P3 are in units of dBm, and Gc is in dB).

SPECTRUM

ANALYZER

SIGNAL

GENERATOR 1

SIGNAL

GENERATOR 2

POWER SUPPLY

SIGNAL

GENERATOR 3

∑

3dB PAD

Figure 3. Test Set-Up for Mixer Two-Tone Measurements.

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