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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
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
DEMO MANUAL DC2077A
50Ω 20dB Gain Block
OUT
18
T_DIODE
16
643122 BD
LTC6431-20
IF Amplifier
dc2077af
1
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Related Manuals for Linear Technology DC2077A
Summary of Contents for Linear Technology DC2077A
- 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: Operation
50Ω single-ended range applications. source and load impedance. Figure 2 shows the DC2077A’s A parallel 62pF (C2) and 348Ω (R1) input network has S-parameters. been added to ensure low frequency stability. Note that the Figure 4 shows the demo circuit’s schematic. - Page 3 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 MANUAL DC2077A 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... -
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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