Linear Technology DC2461A Manuel utilisateur

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DC2461A

ANALOG DEVICES

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dc2461af

DEMO MANUAL DC2461A

Description Absolute MAxiMuM input

rAtings

LTC5548

2GHz to 14GHz Microwave

Mixer with Low IF Frequency

Demonstration circuit 2461A is optimized for evaluation

of the LT C

5548 passive double-balanced mixer with

integrated LO frequency doubler. Its RF port is matched

to 50Ω from 2GHz to 13.6GHz with 9dB return loss, and

the LO port is matched to 50Ω from 1GHz to 12GHz with

10dB return loss. The differential IF port is usable from

DC to 6GHz. The LTC5548 can be used for upconverting

and downconverting applications.

The internal LO doubler can be enabled to allow operation

with a lower frequency LO input signal such as that from

the LTC6945/LTC6946 or LTC6947/LTC6948 family of

frequency synthesizers.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2461A

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

Technology Corporation. All other trademarks are the property of their respective owners.

boArD lAyout

Figure 1. DC2461A

Supply Voltage (EN)....................................................4V

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

LO Input Power (1GHz to 12GHz).........................10dBm

LO Input DC Voltage............................................... ±0.1V

RF Input Power (2GHz to 14GHz).........................20dBm

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

IF Input Power (LF to 6GHz).................................20dBm

IF Input DC Voltage ................................................ ±0.1V

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 precautions when handling

the LTC5548.

dc2461af

DEMO MANUAL DC2461A

proper test setups

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

Figure 3. Test Setup for Upconverting Mixer 2-Tone Measurements

dc2461af

DEMO MANUAL DC2461A

Quick stArt proceDure

notes on test eQuipMent AnD setup

•High performance signal generators with lowharmonic

outputs should be used for 2-tone measurements.

Otherwise, 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 at-

tenuator pads further improves source isolation and

helps prevent the signal generators from producing

intermodulation 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

system performance should be evaluated toensure 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 VCC turrets to the power sup-

ply. 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 5560MHz CW

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

6. Set the RF signal generators to provide one 5799MHz

CW signal and one 5801MHz 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. Setthespectrumanalyzer’scenter frequencyto240MHz

with a span of 10MHz.

8. Perform various measurements

(Conversion Gain, OIP3, LO leakage, etc.)

dc2461af

DEMO MANUAL DC2461A

pArts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C3 CAP, 0.15pF, 100V, ±0.01pF, 0402 AVX, 04021JR15ZBS

2 2 C2, C4 CAP, 22pF, C0G, 50V, 5%, 0402 AVX, 04025A220JAT2A

3 1 C5 CAP, 1µF, X7R, 10V, 10%, 0603 AVX, 0603ZD105KAT2A

4 4 E1 TO E4 TEST POINT, TURRET, 0.061" MTG HOLE MILL-MAX, 2308-2-00-80-00-00-07-0

5 3 J1 TO J3 CONN, SMA 50Ω EDGE-LAUNCH E F JOHNSON, 142-0701-851

6 1 T1 TRANS, MINI-CIRCUITS 4.5MHz TO 3000MHz MINI-CIRCUITS TC1-1-13M+

7 1 U1 IC LTC5548IUDB, QFN 12 PIN, 3mm × 2mm LINEAR TECHNOLOGY CORPORATION, LTC5548IUDB#PBF

dc2461af

DEMO MANUAL DC2461A

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



VCC







1uF



GND



22pF

1 2

LTC5548

GND 1

IF+ 2

IF- 3

GND

VCC

GND 10

LO 11

GND 12

GND 13

0.15pF

1 2

Vcc



0.15pF

1 2

22pF

dc2461af

DEMO MANUAL DC2461A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

LT 0116 • 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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