Linear Technology DC1719A Guida rapida alla configurazione

dc1719af

DEMO MANUAL DC1719A

Description

LTC5569

300MHz to 4GHz 3.3V DUAL

ACTIVE DOWNCONVERTING MIXER

Demonstration circuit DC1719A is optimized for evaluation

of the LTC

5569 dual active downconverting mixer. Its RF

and LO input ports are internally matched to 50Ω from

1.4GHz to 3.3GHz, and from 1GHz to 3.5GHz, respectively.

The IF output uses a bandpass network followed by an

8:1 transformer to provide a 50Ω match at 190MHz. The

LTC5569 dual active mixer is optimized for diversity and for

MIMOreceiverapplicationsthatrequirelowpowerandsmall

size.Eachmixerincludes an independentLObufferamplifier,

an active mixer core, and a bias circuit with an enable pin.

The symmetry of the IC assures that a phase and ampli-

tude coherent LO is applied to each mixer. Broadband

integrated transformers on the RF and LO inputs provide

single-ended 50Ω interfaces. The differential IF outputs

allow convenient interfacing to differential IF filters and

amplifiers.

Design files for this circuit board are available at

http://www.linear.com/demo

BoarD photo

Figure 1. Test Setup for Mixer 2-Tone Measurements

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.

aBsolute MaxiMuM ratings

Supply Voltage (VCCA, VCCB, IFA+, IFA–,

IFB+, IFB–)...................................................................4V

Enable Input Voltage (ENA, ENB) ......–0.3V to VCC + 0.3V

Mixer Bias Voltage (BIASA, BIASB)....–0.3V to VCC + 0.3V

LO Input Power (350MHz to 4.3GHz)...................10dBm

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

RF Input Power (300MHz to 4GHz)......................15dBm

RF Input DC Voltage (RFA, RFB) ............................ ±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 LTC5569.

dc1719af

DEMO MANUAL DC1719A

notes on test equipMent anD setup

quick start proceDure

• Use high performance signal generators with low

harmonic outputs for 2-tone measurements to avoid

distortion. Otherwise, lowpass filters at the signal gen-

erator 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. Attenuator pads

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

input port of the LTC5569 mixer, as shown in Figure1.

Adding attenuator pads further improves source iso-

lation 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 depending on

the spectrum analyzer used.

• Before performing measurements on the DUT, the

system performance should be evaluated to ensure

that a clean input signal is obtained and that the spec-

trum analyzer’s internal distortion is minimized.

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 2 C1, C2 0402 2.7pF ±0.25pF 50V NPO AVX, 04025A2R7CAT2A

2 1 C5 CAP, 0402 3.9pF ±0.1pF 50V NPO AVX, 04025A3R9BAT

3 4 C7, C8, C9, C10 CAP, 0402 10nF 10% 25V X7R AVX, 04023C103KAT

4 1 C11 CAP, 0603 2.2µF 10% 6.3V X5R AVX, 06036D225KAT

5 5 J1, J2, J3, J4, J5 CONN, BNC, SMA 50Ω EDGE-LANCH E. F. JOHNSON, 142-0701-851

6 4 L1, L2, L3, L4 0603 180nH 2% COILCRAFT, 0603HP-R18XGL

7 0 R1, R2, R3, R4 RES, 0402 OPTION OPTION

8 4 TP1, TP2, TP3, TP4 TURRET MILL-MAX, 2308-2-00-80-00-00-07-0

9 2 T1, T2 XFMR, WIDEBAND 2MHz TO 500MHz MINI-CIRCUITS, TC8-1+

10 1 U1 IC, DUAL ACTIVE DOWNCONVERTING MIXER LINEAR TECHNOLOGY, LTC5569IUF

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

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

the current limit to 250mA.

3. Connect the VCC pin to the 3.3V supply. Connect ENA

to the 3.3V supply.

BE SURE TO CONNECT THE VCC PIN

BEFORE

THE

ENA PIN TO ENSURE THAT THE PART DOES NOT GET

DAMAGED. ALSO, REMOVE POWER FROM ENA PIN

BEFORE

REMOVING POWER FROM THE VCC PIN.

4. Set the LO signal generator to provide a 2140MHz CW

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

5. Set the RF signal generators to provide one 1950MHz

CW signal and one 1951MHz 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

RFA port. The two tones should be set to about –6dBm

each at the mixer’s RF input port.

6. Set the spectrum analyzer’s center frequency to

190MHz.

7. Perform various measurements (conversion gain,

OIP3, LO leakage, etc.).

dc1719af

DEMO MANUAL DC1719A

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

Figure 2. Dual Active Mixer

dc1719af

DEMO MANUAL DC1719A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0611 • 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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