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AN-2195 Datasheet(PDF) 4 Page - Texas Instruments

Part No. AN-2195
Description  AN-2195 Driving High Speed ADCs with the LMH6521 DVGA for High IF AC-Coupled Applications
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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AN-2195 Datasheet(HTML) 4 Page - Texas Instruments

   
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182
187
192
197
202
75
80
85
90
95
FREQUENCY (MHz)
PO = -1dBFS
PO = -3dBFS
PO = -6dBFS
182
187
192
197
202
65
70
75
80
FREQUENCY (MHz)
PO = -1dBFS
PO = -3dBFS
PO = -6dBFS
IF Band
IF Band
[MHz]
38.4
76.8
HD2
HD3
IF-Sampling Frequency Plan
www.ti.com
4
IF-Sampling Frequency Plan
The ADC16DV160 sub-samples the 192 MHz IF signal with a 153.6 MSPS clock so that the 20MHz signal
band aliases to the center of the first Nyquist zone at 38.4 MHz. A large benefit of this plan is the
placement of the 2nd order harmonic, H2, completely out of the band of interest when it aliases. HD3
cannot be excluded from the signal band and must be reduced in the system as much as possible. The
frequency ranges of the HD2 and HD3 aliases are shown in Figure 4.
Figure 4. Using Impedance Transform to Realize Voltage Gain
5
System Performance
Figure 5 and Figure 6 show the SFDR and SNR performance over frequency of the circuit shown in
Figure 1. The input signal is measured at
−1, −3, and −6 dBFS of the ADC.
Figure 5. SFDR Performance vs. Input Signal
Figure 6. SNR Performance vs. Input Signal Frequency
Frequency
4
AN-2195 Driving High Speed ADCs With the LMH6521 DVGA for High IF
SNOA569A – November 2011 – Revised April 2013
AC-Coupled Applications
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Copyright © 2011–2013, Texas Instruments Incorporated


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