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dc2091afa

DEMO MANUAL DC2091A

Description

LTC5599

30MHz to 1300MHz Low Power

Direct Quadrature Modulator

Demonstration circuit 2091A is optimized for evaluation 

of the 

LTC

®

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

(V

CMBB

 = 1.4V

DC

)

SPECTRUM

ANALYZER

LO SIGNAL

SOURCE

DC POWER SUPPLY

(3.3V)

– +

–3dB

–6dB

Содержание LTC5599

Страница 1: ... 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 andallowsoptimizationoftheLOcarrierfeedthrough and side band suppression Design files for this circuit board are availabl...

Страница 2: ...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 ...

Страница 3: ...µF R10 49 9Ω C8 0 1µF R11 49 9Ω C9 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 MeasuretheOutput1dBCompressionPointbyincreas ing the input signal level until the Voltage Conversion Gain degrades by 1dB 13 Measure the Image ...

Страница 4: ... HD 2X7 0 79 1 2 6 4 7 5 10 9 11 12 14 A0 A1 A2 VSS VCC WP SCL SDA U2 24LC025 1 2 3 4 8 7 6 5 VCC_B DIR VCC_A GND U4 74LVC1T45GW 6 5 4 1 2 3 C18 2 2pF R20 100Ω R19 1k C15 0 1µF C16 0 1µF C17 0 1µF C14 0 1µF VCC VCC_L VCC_L VCC_L GND U3 NC7WZ17P6X 6 4 5 1 3 2 C13 2 2pF R26 1k C11 0 1µF VCC VCC_L GND U5 NC7WZ17P6X 6 4 5 1 3 2 C12 2 2pF C10 2 2pF R25 1k R23 1k R22 200k SDO SDI SCLK CS VCC_L VCC VCC_L...

Страница 5: ...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 RE...

Страница 6: ...NCLUDING 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 ...

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