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Linear Technology LTC6431-20 Demo Manual

50o 20db gain block if amplifier
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DESCRIPTION
Demonstration circuit 2077A features the
50Ω gain block IF amplifier. The LTC6431-20 has a power
gain of 20.8dB and it is part of the LTC6431-YY amplifier
series.
The DC2077A demo board supports the LTC6431-YY am-
plifier family. The DC2077A demo board is optimized for
a frequency range from 100MHz to 1200MHz. It incorpo-
rates a minimum of passive components to configure the
BLOCK DIAGRAM
Arrow.com.
Downloaded from
DEMO MANUAL DC2077A
LTC
6431-20
amplifier for various applications. The LTC6431-20 pro-
®
vides 50Ω single-ended input and output impedances so
that it can be easily evaluated with most RF test equipment.
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.
V
CC
9, 22
BIAS AND
TEMPERATURE
COMPENSATION
IN
20dB
24
GAIN
GND
8, 17, 23,
25 (EXPOSED PAD)
Figure 1. LTC6431-20 Device Block Diagram
LTC6431-20
50Ω 20dB Gain Block
IF Amplifier
OUT
18
T_DIODE
16
643122 BD
dc2077af
1

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Summary of Contents for Linear Technology LTC6431-20

  • Page 1 The DC2077A demo board is optimized for L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear a frequency range from 100MHz to 1200MHz. It incorpo- Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Performance Summary

    DEMO MANUAL DC2077A 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 95mA OUTPUT OUTPUT...
  • Page 3 Consequently, accurate measure- interface. ment of IP3 for a low distortion IC such as the LTC6431-20 requires certain precautions to be observed in the test The DC2077A is a wide bandwidth demo board, but it is not setup as well as the testing procedure.
  • Page 4 DEMO MANUAL DC2077A 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 5: Quick Start Procedure

    Demo circuit 2077A can be set up to evaluate the perfor- 4. Change the spectrum analyzer’s center frequency and mance of the LTC6431-20. Refer to Figure 3 for proper observe the two IM3 tones at 1 MHz below and above equipment connections and follow the procedure below: the input frequencies.

  • Page 6: Parts List

    DEMO MANUAL DC2077A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER C1, C3, C7 CAP., X7R, 1000pF, 50V 5%, 0603 AVX, 06035C102JAT2A CAP., NPO, 62pF, 25V, 5%, 0402 AVX, 04023A620JAT CAP., X5R, 0.1µF, 10V, 10%, 0603 AVX, 0603ZD104KAT2A C5, C8 CAP., X7R, 1000pF, 50V 5%, 0402 AVX, 04025C102JAT2A CAP., OPT, 0603...

  • Page 7: 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 8 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.

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