Linear Technology DC426B Operator's manual

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DC426B DEMO BOARD QUICK START GUIDE

Description:

The DC426B demo circuit board is intended to demonstrate the capabilities of the LT5511 high

signal level upconverting mixer IC for 1900MHz infrastructure applications.

The LT5511 mixer IC is designed to meet the high linearity requirements of cable TV

infrastructure downstream transmitters and wireless infrastructure transmit systems. The IC

includes a differential LO buffer amplifier driving a double-balanced mixer. The LO, RF and IF

ports can be easily matched to a broad range of frequencies for different applications. The high

performance capability of the LO buffer allows the use of a single-ended source, thus eliminating

the need for an LO balun.

The LT5511 mixer delivers +17dBm typical input 3rd order intercept at 950MHz, and +15.5dBm

IIP3 at 1900MHz, with IF input signal levels of –5dBm. The input 1dB compression point is

typically +6dBm.

The DC426B demo board is optimized to upconvert a 50MHz IF input to 1900MHz RF output

with the LO injected from the high-side at 1950MHz.

Figure 1. LT5511 IC Block Diagram

BUFFER

LO- LO+

IF-

IF+

GND

VCCBIAS

BIAS

8 9

RF-

RF+

GND

(BACKSIDE)

GND

VCCLO

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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 2nd

order distortion measurement. (IIP2 = 2 * P1 – P2 – Gc, where P1 is the power level of the

desired output at 1900MHz, P2 is the largest 2nd order product at either 1850MHz or

2050MHz, and Gc is conversion gain. P1 and P2 are in units of dBm, and Gc is in dB.)

POWER SUPPLY

SPECTRUM

ANALYZER

SIGNAL

GENERATOR 2

SIGNAL

GENERATOR 1

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

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LT5511 Upconverting Mixer Two-Tone Measurements for 1900MHz Band.

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

Note: 1). A high quality combiner that provides 50-ohm termination on all ports and has

good port-to-port isolation should be used.

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

source isolation.

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 and #3 to provide two -5dBm CW signals to the demo board IFin

port—one at 50MHz, and the other at 51MHz.

6. Set the Spectrum Analyzer’s center frequency to 1899.5MHz. Perform input 3rd order

distortion measurement. (IIP3 = P1 + (P1 – P3) / 2 – Gc, where P1 is the lowest power level

of the two desired output tones at either 1899MHz or 1900MHz, P3 is the largest 3rd order

product at either 1898MHz or 1901MHz, and Gc is conversion gain. P1 and P3 are in units

of dBm, and Gc is in dB.)

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

POWER SUPPLY

SPECTRUM

ANALYZER

SIGNAL

GENERATOR 1

SIGNAL

GENERATOR 3

∑

SIGNAL

GENERATOR 2

3dB PAD 3dB PAD

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