Linear Technology LTC5599 Guida rapida alla configurazione

dc2091afa

DEMO MANUAL DC2091A

Description

LTC5599

30MHz to 1300MHz Low Power

Direct Quadrature Modulator

Demonstration circuit 2091A is optimized for evaluation

of the LT C

5599 low power direct quadrature modulator.

The balanced I and Q baseband input ports can be either

AC- or DC-coupled to a source with a common mode volt-

age level of about 1.4V. Fixed LC networks on the LO and

RF ports cover a continuous 90MHz to 1300MHz range.

The SPI interface controls the supply current, modulator

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

QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

gain, and allows optimization of the LO carrier feedthrough

and side-band suppression.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2091A

MeasureMent setup

Figure 1. Test Setup for RF Performance Measurements

I+

I–

Q+

Q–

DC2091 F01

BB SIGNAL SOURCE

(VCMBB = 1.4VDC)

SPECTRUM

ANALYZER

LO SIGNAL

SOURCE

DC POWER SUPPLY

(3.3V)

– +

–3dB –6dB

dc2091afa

DEMO MANUAL DC2091A

notes on test equipMent anD setup

• Use high performance signal generators with fully

configurable differential I and Q outputs, such as the

Rohde & Schwarz SMJ100A vector signal generator or

equivalent.

• Use narrow resolution bandwidth (RBW) and engage

video averaging on the spectrum analyzer to lower the

displayedaveragenoiselevel(DANL)inordertoimprove

sensitivity and to increase dynamic range. The trade-off

is increased sweep time.

• Spectrum analyzers can produce significant internal dis-

tortionproductsiftheyareoverdriven.Generally,spectrum

analyzers are designed to operate at their best with about

–30dBm to –40dBm at their input filter or preselector.

Sufficient spectrum analyzer input attenuation should be

used to avoid saturating the instrument, but too much

attenuation reduces sensitivity and dynamic range.

• Before taking measurements, the system performance

should be evaluated to ensure that:

1) clean input signals can be produced

2) the spectrum analyzer’s internal distortion is mini-

mized

3) the spectrum analyzer has enough dynamic range

and sensitivity

4) the system is accurately calibrated for power and

frequency.

• Digital modulation often requires DC coupling and flat

frequency response. For best EVM performance with

complex modulation, the RC networks at the baseband

I/Q inputs are not required.

quick start proceDure

1. Remove the demonstration circuit from its protective

packaging in an ESD-safe working area.

2. Turn off the DC power supply as well as the baseband

and LO signal sources’ outputs.

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

4. Make sure jumper JP1 is installed and the jumper JP2

is installed at the 1-2 position.

5. Slowly increase the supply voltage to 3.3V. Do not

exceed 3.8V.

6. Turn on the baseband signal source. Set the baseband

common mode bias to 1.4V.

7. Verify the total VCC supply current is approximately

28mA. The demonstration circuit is now turned on

and is ready for measurements.

8. Turn on the output of the LO source and apply a

492.8MHz, 0dBm CW Signal.

9. Set the baseband signal source to provide a 100kHz,

200mVP-P(DIFF) baseband input signal. The I and Q

channels should be 90° shifted and set for lower

sideband selection.

10. Measure the modulator’s RF output on the Spectrum

Analyzer at 492.7MHz.

absolute MaxiMuM input ratings

Supply Voltage .........................................................3.8V

Common Mode Level of BBPI, BBMI,

and BBPQ, BBMQ ...................................................2V

LOL, LOC DC Voltage ............................................. ±0.1V

LOL, LOC Input Power .........................................20dBm

Voltage on Any Pin...........................–0.3V to VCC + 0.3V

TJMAX .................................................................... 150°C

Case Operating Temperature Range....... –40°C to 105°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 LTC5599.

dc2091afa

DEMO MANUAL DC2091A

DeMo boarD scheMatic

VCTRL

GND

LOL

LOC

GND

TTCK

GND

VCC

SDO

SDI

SCLK

CSB

GNDRF

GND

BBMQ

BBPQ

BBMI

BBPI

TEMP

LTC5599IUF

0.01µF

L1, 39nH

C5, 15pF

0.1µF

R1, 1Ω

VCTRL

TTCK

TEMP

BBMI

BBPI

GND

SDO

SDI

SCLK

VCC

3.3V

VCC

FB1

330Ω AT

100MHz

DC2091 F02

BBPQ

BBMQ

R12, OPT

R2, OPT

49.9Ω

0.1µF

R3, 0Ω

R4, 0Ω

R5, 0Ω

R6, 0Ω

4.7µF

C2, 1000pF

JP1

2 1

49.9Ω

0.1µF

R10

49.9Ω

0.1µF

R11

49.9Ω

0.1µF

* REMOVE THE RC NETWORK FOR BEST EVM WITH COMPLEX DIGITAL MODULATION.

Figure 2. Low Power I/Q Modulator Schematic

quick start proceDure

11. Calculate the Voltage Conversion Gain:

Gain=20•log (VRF(OUT)(50Ω) / VIN(DIFF)(I OR Q))

12. MeasuretheOutput1dBCompression Point by increas-

ing the input signal level until the Voltage Conversion

Gain degrades by 1dB.

13. Measure the Image Rejection at 492.9MHz.

14. Measure the LO Leakage at 492.8MHz.

15. Connect the DC590B to the DC2091A with the ribbon

cable provided. Make sure jumper JP6 on the DC590B

is set to 3.3V.

16. Run QuikEval

to start the GUI associated with the

LTC5599.

17. The turn off procedure is the reverse of the turn on

procedure. Make sure VCC is removed after VEN.

dc2091afa

DEMO MANUAL DC2091A

Figure 3. Demo Board SPI Interface

R14

4.99k

R13

4.99k

R15

4.99k

R18

4.99k

ISO_7V_UNREG

ISO_5V_3p3v_REG

ISO_CSb

ISO_SCK_SCL

ISO_SDA_MOSI

ISO_MISO

EE_VCC

EE_SDA

EE_SCL

EE_GND

GPI01

ISO_GND

HD-2X7.0.79

VSS

VCC

SCL

SDA

24LC025

VCC_B

DIR

VCC_A

GND

74LVC1T45GW

C18

2.2pF

R20

100Ω

R19

C15

0.1µF

C16

0.1µF

C17

0.1µF

C14

0.1µF

VCC

VCC_L

GND

NC7WZ17P6X

C13

2.2pF

R26

C11

0.1µF

VCC

VCC_L

GND

NC7WZ17P6X

C12

2.2pF

C10

2.2pF R25

R23

R22

200k

SDO

SDI

SCLK

VCC_L

VCC

VCC_L

JP1

DC2091 F03

DeMo boarD scheMatic

dc2091afa

DEMO MANUAL DC2091A

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.

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., X5R, 4.7µF, 10%, 16V, 0603 MURATA, GRM188R61C475KAAJD

2 1 C2 CAP., C0G, 1000pF, 5%, 50V, 0402 MURATA, GRM1555C1H102JA01D

3 10 C3, C6–C9, C11, C14–C17 CAP., X7R, 0.1µF, 10%, 16V, 0402 MURATA, GRM155R71C104KA88D

4 1 C4 CAP., X7R, 0.01µF, 10%, 16V, 0402 MURATA, GRM155R71C103KA01D

5 1 C5 CAP., COG, 15pF, 5%, 50V, 0402 MURATA, GRM1555C1H150JA01D

6 4 C10, C12, C13, C18 CAP.,COG, 2.2pF,+/-.1pF, 25V, 0402 MURATA, GRM1555C1E2R2BZ01D

7 5 E1, E2, E3, E7, E8 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0

8 3 E4, E5, E6 TESTPOINT, TURRET, .063" MILL-MAX, 2308-2-00-80-00-00-07-0

9 1 FB1 FERRITE BEAD, 33Ω @100MHz TDK, MPZ1608S331AT

10 1 JP1 HEADER, 2 PIN, 0.079 SINGLE ROW SULLINS, NRPN021PAEN-RC

11 1 JP2 HEADER, 3 PIN, 0.079 SINGLE ROW SULLINS, NRPN031PAEN-RC

12 2 XJP4, XJP5 SHUNT, 2mm Ctrs. SAMTEC, 2SN-BK-G

13 6 J1–J6 CONN., SMA, 50Ω, EDGE-LANCH E.F.JOHNSON, 142-0701-851

14 1 L1 IND., 39nH, 0402HP COILCRAFT, 0402HP-39NXJLU

15 1 P1 HEADER, 2X7PIN, 0.079CC MOLEX, 87831-1420

16 1 R1 RES., CHIP, 1Ω, 1%, 0402 VISHAY, CRCW04021R00FNED

17 0 R2, R12 OPT, 0402

18 4 R3, R4, R5, R6 RES., CHIP, 0Ω, 0402 VISHAY, CRCW04020000Z0ED

19 4 R8, R9, R10, R11 RES., CHIP, 49.9Ω, 1%, 0402 VISHAY, CRCW040249R9FKED

20 3 R13, R14, R15 RES., CHIP, 4.99K, 1%, 0402 VISHAY, CRCW04024K99FKED

21 5 R18, R19, R23, R25, R26 RES., CHIP, 1K, 1%, 0402 VISHAY, CRCW04021K00FKED

22 1 R20 RES., CHIP, 100Ω, 1%, 0402 VISHAY, CRCW0402100RFKED

23 1 R22 RES., CHIP, 200K, 1%, 0402 VISHAY, CRCW0402200KFKEA

24 1 U1 IC., LTC5599, QFN-24-4X4 LINEAR TECHNOLOGY, LTC5599IUF#PBF

25 1 U2 IC, EEPROM 2KBIT 400KHZ 8TSSOP MICROCHIP TECH., 24LC025-I/ST

26 2 U3, U5 I.C., DUAL BUFFER SCHMT TRIG UHS SC706 FAIRCHILD SEMI., NC7WZ17P6X

27 1 U4 I.C., DUAL TRANSCEIVER 3ST 6TSSOP NXP, 74LVC 1T45GW,125

28 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT DC2091A

dc2091afa

DEMO MANUAL DC2091A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2014

LT 1115 REV A • 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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