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Linear Technology LTC6430-20 Demo Manual

50mhz to 1000mhz 75o input/output catv amplifier
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DESCRIPTION
Demonstration circuit 2078A is a 75Ω input and 75Ω output
push-pull CATV amplifier featuring the
LTC6430-20 has a power gain of 20.8dB and is part of the
LTC6430-YY amplifier series.
The DC2078A demo board is optimized for the frequency
range from 50MHz to 1000MHz. It incorporates a mini-
mum of passive support components to configure the
LTC6430-20 BLOCK DIAGRAM
75Ω INPUT/OUTPUT CATV AMPLIFIER
LTC
6430-20. The
®
+IN
20dB
24
GAIN
–IN
20dB
7
GAIN
GND
8, 14, 17, 23 AND PADDLE 25
DEMO MANUAL DC2078A
50MHz TO 1000MHz
amplifier for the CATV applications with 75Ω input and
output impedance.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2078A
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.
V
CC
9, 22
BIAS AND TEMPERATURE
COMPENSATION
LTC6430-20
+OUT
18
T_DIODE
16
–OUT
13
643020 BD
dc2078af
1

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Summary of Contents for Linear Technology LTC6430-20

  • Page 1 The DC2078A demo board is optimized for the frequency L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear range from 50MHz to 1000MHz. It incorporates a mini- Technology Corporation. All other trademarks are the property of their respective owners.
  • Page 2 DEMO MANUAL DC2078A PERFORMANCE SUMMARY = 25°C, V = 5V Table 1. Typical Demo Board Performance Summary SYMBOL PARAMETER CONDITIONS VALUE/UNIT Power Supply Operating Supply Range All V Pins Plus ±OUT 4.75V to 5.25V Current Consumption Total Current 170mA OUTPUT THIRD- OUTPUT THIRD- SECOND THIRD...

  • Page 3: Operation

    100Ω impedance pling capacitors (C9, C10, C11 and C12) provide bias to of the LTC6430-20 to single-ended 75Ω impedance. The the RF ±OUT nodes. Only a single 5V supply is necessary frequency range of the circuits is limited by the balun for the V pins on the device.
  • Page 4 Consequently, accurate measure- solder mask on the back side of the PCB to prevent solder ment of IP3 for a low distortion IC such as the LTC6430-20 from wicking away from the critical PCB to the exposed requires certain precautions to be observed in the test pad interface.
  • Page 5 DEMO MANUAL DC2078A OPERATION Setup Signal Sources Setup the Spectrum Analyzer Figure 4 shows a proposed IP3 test setup. This setup has a. Adjust the spectrum analyzer for maximum possible low phase noise, good reverse isolation, high dynamic resolution of the intermodulation products’ amplitude range, sufficient harmonic filtering and wideband imped- in dBc.
  • Page 6 Demo circuit 2078A can be set up to evaluate the perfor- 4. Change the spectrum analyzer’s center frequency and mance of the LTC6430-20. Refer to Figure 4 for proper observe the two IM3 tones at 1MHz below and above equipment connections and follow the procedure below: the input frequencies.

  • Page 7: Quick Start Procedure

    DEMO MANUAL DC2078A QUICK START PROCEDURE SIGNAL (HP8644A) GENERATOR 1 AMPLIFIER MINI-CIRCUITS, ZHL-2 OR EQUIVALENT 20dB ATTENUATION PAD LOW PASS FILTER (MATCHES DUT GAIN) DUT GAIN 1dBm/TONE 3dB ATTENUATION PAD APPROX. 19dB 6dB ATTENUATION PAD COAXIAL CABLE (OPTIONAL) –5.7dB –5.7dB MINIMUM LOSS COMBINER MINIMUM LOSS...

  • Page 8: Parts List

    DEMO MANUAL DC2078A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART # C1, C2, C7,C8 CAP., X5R, 0.047μF, 25V 10%, 0603 AVX, 06033D473KAT2A C3, C4, C19, C20 CAP., 0603, OPT C5, C6 CAP., X7R, 1000pF, 50V 5%, 0402 AVX, 04025C102JAT2A C9, C11 CAP., X5R, 0.1μF, 10V, 10%, 0603 AVX, 0603ZD104KAT2A C10, C12...

  • Page 9: Schematic Diagram

    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.
  • Page 10 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.
  • Page 11 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC2078A...