Linear Technology DC2070A Quick setup guide

dc2070af

DEMO MANUAL DC2070A

Description

LTC5577

300MHz to 4GHz

High Signal Level Active

Downconverting Mixer

DemonstrationcircuitDC2070Aisoptimizedfor evaluation

of the LT C

5577 high signal level active downconverting

mixer. Its RF input port is matched to 50Ω from 1.3GHz to

4.3GHz with 12dB return loss, and the LO port is matched

to 50Ω from 950MHz to 4.1GHz with 10dB return loss.

The RF and LO inputs are easily matched for higher or

lower frequencies with simple external matching, as low

as350MHz and 300MHz, respectively. The low capacitance

differential IF output is usable up to 1.5GHz. The LTC5577

active mixer is optimized for RF downconverting applica-

tions that require high input signal handling capability and

wide bandwidth.

Design files for this circuit board are available at

http://www.linear.com/demo

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.

Figure 1. Test Setup for Mixer 2-Tone Measurements

Absolute MAxiMuM input

rAtings

Supply Voltage (VCC, IF+, IF–).....................................4V

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

LO Input Power (350MHz to 4.5GHz)...................10dBm

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

RF Input Power (300MHz to 4GHz)......................18dBm

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

TEMP Monitor Input Current..................................10mA

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 ELECTRO-

STATIC DISCHARGE (ESD). OBSERVE PROPER ESD

PRECAUTIONS WHEN HANDLING THE LTC5577.

boArD photo

dc2070af

DEMO MANUAL DC2070A

notes on test equipMent AnD setup

quick stArt proceDure

n High performance signal generators with low harmonic

outputs should be used for 2-tone measurements.

Otherwise, low pass filters at the signal generator out-

puts should be used to suppress harmonics.

n High quality combiners should be used to present a

broadband 50Ω termination on all ports as well as

provide good port-to-port isolation. Attenuator pads

should be used on the inputs to the combiner and the RF

input port of the LTC5577 mixer, as shown in Figure 1.

Adding attenuator pads further improves source iso-

lation and helps prevent the signal generators from

producing intermodulation products.

1. Set the power supply output voltage to 3.3V and the

current limit to 250mA. Turn off the power supply

output.

2. Connect all test equipment and the power supply as

shown in Figure 1.

n 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 depending on

the spectrum analyzer used.

n Before performing measurements on the DUT, the

system performance should be evaluated to ensure that

a clean input signal is obtained and that the spectrum

analyzer’s internal distortion is minimized

3. Ramp on the power supply with a minimum ramp time

of 1ms.

4. Set the LO signal generator to provide an 1800MHz

CW signal at about 0dBm at the DC2070A’s LO port.

pArts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 4 C1, C2, C7, C8 CAP, 1nF, 10%, 16V, X7R, 0402 MURATA, GRM155R71C102KA01D

2 1 C3 CAP, 8.2pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H8R2CA01D

3 1 C4 CAP, 0.7pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1HR70BB01D

4 1 C5 CAP, 3.9pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H3R9BB01D

5 0 R3, L4, L5, L6, C6, C10, C11,

C12, C13

COMP, 0402, OPT 0402

6 1 C9 CAP, 1µF, 10%, 10V, X7R, 0603 MURATA, GRM188R61A105KA61D

7 3 E1, E3, E4 TURRET, PAD, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

8 1 E2 TURRET, PAD, 0.061" MILL-MAX, 2308-2-00-80-00-00-07-0

9 4 J1-J4 CONN, SMA, 50Ω, EDGE-LAUNCH E.F. JOHNSON, 142-0701-851

10 2 L1, L2 IND, 560nH, 2%, 0603 COILCRAFT, 0603LS-561XGL

11 2 R1, R2 RES, CHIP, 115, 1%, 0402 VISHAY, CRCW0402115RFKED

12 1 U1 IC, LINEAR TECHNOLOGY, LTC5577IUF,

QFN16, 4×4

LINEAR TECHNOLOGY, LTC5577IUF

dc2070af

DEMO MANUAL DC2070A

scheMAtic DiAgrAM

Figure 2. High Signal Level Active Mixer

5. Set the two RF signal generators to provide one

1949MHz CW signal and one 1951MHz CW signal.

The signals should be applied to the 0° combiner. The

power applied to the DC2070A’s RF input port should

be about –3dBm/tone.

6. Perform various measurements (conversion gain, IP3,

LO leakage, etc.).

7. To turn off the DC2070A, either turn off the power sup-

ply’s output, or remove the power leads starting with

the EN lead.

quick stArt proceDure

dc2070af

DEMO MANUAL DC2070A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 1113 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

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

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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