AN-2195 Datasheet, PDF (1/6 Pages) Texas Instruments – AN-2195 Driving High Speed ADCs with the LMH6521 DVGA for High IF AC-Coupled Applications

Application Report
SNOA569A – November 2011 – Revised April 2013
AN-2195 Driving High Speed ADCs with the LMH6521
DVGA for High IF AC-Coupled Applications
.....................................................................................................................................................
ABSTRACT
This application report discusses driving high speed ADCs with the Texas Instruments LMH6521 DVGA
for high IF AC-coupled applications.
Contents
1 Introduction .................................................................................................................. 2
2 Circuit Description ........................................................................................................... 2
3 Tapped Inductor Band-pass Filter ........................................................................................ 2
4 IF-Sampling Frequency Plan .............................................................................................. 4
5 System Performance ....................................................................................................... 4
6 Optimal Performance ....................................................................................................... 5
List of Figures
1
Tapped-L Band-pass Filter For fc = 192 MHz with a 20 MHz Bandwidth Designed for 100Ω Impedance ..... 2
2 Single-Ended Tapped-L Band-pass Filter Segments .................................................................. 3
3 192 MHz Tapped-L Filter Profile .......................................................................................... 3
4 Using Impedance Transform to Realize Voltage Gain ................................................................. 4
5 SFDR Performance vs. Input Signal Frequency ........................................................................ 4
6 SNR Performance vs. Input Signal Frequency.......................................................................... 4
7 Output Inductors at 90 Degrees........................................................................................... 5
List of Tables
1 SNR and SFDR Results ................................................................................................... 5
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SNOA569A – November 2011 – Revised April 2013
AN-2195 Driving High Speed ADCs With the LMH6521 DVGA for High IF
1
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