Analog Devices Linear Technology DC2668A Guida rapida alla configurazione

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DEMO MANUAL DC2668A

DESCRIPTION ABSOLUTE MAXIMUM INPUTS

LTC5552

3GHz to 20GHz Microwave Mixer

with Wideband DC to 6GHz IF

Demonstration circuit 2668A is optimized for evaluation

of the LT C

5552 passive double-balanced mixer. Its RF

port is broadband matched from 3GHz to 20GHz, and the

internal LO amplifier, requiring only a 0dBm drive level,

is broadband matched to 50Ω from 1GHz to 20GHz with

10dB Return Loss. The differential IF output is usable

from DC to 6GHz. The LTC5552 can be used for upcon-

verting and downconverting applications.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2668A

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog

Devices, Inc. All other trademarks are the property of their respective owners.

BOARD PHOTO

Figure 1. DC2668A

Supply Voltage (VCC)...............................................4.0V

Enable Input Voltage (EN) ................. –0.3V to VCC+0.3V

LO Input Power (1GHz to 20GHz).........................10dBm

RF Power (3GHz to 20GHz)..................................20dBm

RF DC Voltage........................................................ ±0.1V

IF+/IF–Power (LF to 6GHz)..................................20dBm

IF+/IF–DC Voltage..................................................±0.3V

Operating Temperature Range (TC)........ –40°C to 105°C

Junction Temperature (TJ).................................... 150°C

Storage Temperature Range .................. –65°C to 150°C

CAUTION: THIS PART IS SENSITIVE TO ELECTROSTATIC

DISCHARGE (ESD). OBSERVE PROPER ESD PRECAU-

TIONS WHEN HANDLING THE LTC5552.

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DEMO MANUAL DC2668A

PROPER TEST SETUPS

Figure 3. Test Setup for Upconverting Mixer Two-Tone Measurements

Figure 2. Test Setup for Downconverting Mixer Two-Tone Measurements

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DEMO MANUAL DC2668A

NOTES ON TEST EQUIPMENT SETUP

QUICK START PROCEDURE

•High performance signal generators with low harmonic

outputs should be used for 2-tone measurements. Oth-

erwise, low-pass filters at the signal generator outputs

should be used to suppress harmonics.

•High quality combiners should be used to present a

broadband 50Ω termination on all ports as well as

provide good port-to-port isolation. Adding attenua-

tor pads further improves source isolation and helps

prevent the signal generators from producing inter-

modulation products.

•Spectrum analyzers can produce significant internal

distortion products if they are overdriven. Generally,

spectrum analyzers are designed to operate at their

best with about –30dBm to –40dBm at their input. The

spectrum analyzer’s input attenuation setting should be

used to avoid saturating the instrument.

•Set the spectrum analyzer’s input attenuation depend-

ing on the spectrum analyzer used.

•Before performing measurements on the DUT, the sys-

tem performance should be evaluated to ensure that

a clean input signal is obtained and that the spectrum

analyzer’s internal distortion is minimized.

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

2. Set the power supply output voltage to 3.3V and set

the current limit to 200mA.

3. Connect the ground and V

turrets to the power supply.

BE SURE TO CONNECT THE VCC TURRET BEFORE THE

EN TURRET TO ENSURE THAT THE PART DOES NOT

GET DAMAGED. ALSO, REMOVE POWER FROM EN

TURRET BEFORE REMOVING POWER FROM THE VCC

TURRET.

4. Connect the EN turret to the power supply.

5. Set the LO signal generator to provide a 9560MHz CW

signal at about 0dBm to the demo board’s LO port.

6. Set the RF signal generators to provide one 9799MHz

CW signal and one 9801MHz CW signal. The signals

should be applied to the 2-way combiner. The output

of the combiner should be applied to the demo board’s

RF input port. The two tones should be set to –5dBm

each at the mixer’s RF input port.

7. Set the spectrum analyzer’s center frequency to

240MHz.

8. Perform various measurements (Conversion Gain,

OIP3, LO leakage, etc.).

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DEMO MANUAL DC2668A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., 18pF, C0G, 10V, 2%, 0402 AVX, 0402ZK180GBSTR

2 1 C2 CAP., 18pF, C0G, 50V, 1%, 0402 MURATA, GJM1555C1H180FB01

3 1 C3 CAP., 1μF, X7R, 10V, 10%, 0603 MURATA, GRM188R71A105KA61

4 3 E1-E3 TEST POINT, TURRET, 0.061" MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0

5 2 J1, J2 CONN., SMA, 50Ω, EDGE-LAUNCH E.F. JOHNSON, 142-0761-881

6 1 J3 CONN., SMA, 50Ω, EDGE-LAUNCH E.F. JOHNSON, 142-0701-851

7 1 T1 XFMR., 1:1, 4.5-3000MHz MINI-CIRCUITS, TC1-1-13M+

8 1 U1 I.C., LTC5552IUDB, QFN 12 PIN, 3mm × 2mm LINEAR TECHNOLOGY, LTC5552IUDB#PBF

dc2668afa

DEMO MANUAL DC2668A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

SCHEMATIC DIAGRAM

D D

C C

B B

A A

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

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





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









 









 













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 













 

 

 

























 

 

 

 

















dc2668afa

DEMO MANUAL DC2668A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0717 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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