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Publication No. REF-000-009-R00

Red Rapids

Page 15

4.3 Generating Characterization Plots

The wide dynamic range and input bandwidth characteristics of the receiver levy strict
signal conditioning requirements on test equipment used to characterize board
performance.  Even the highest quality general purpose RF signal generators output
harmonics and noise that must be reduced in order to accurately characterize system
performance.  Generally a narrow bandpass filter is inserted between the signal generator
output and the Adapter Module receiver input.  The bandpass filter should be reasonably
narrow to eliminate generator harmonics and limit the amount of generator phase noise
input into the receiver.  Red Rapids’ characterization plots were created using 5%
bandwidth 7-section Chebyshev filters with > 55 dB of stop band rejection.  We used filters
from TTE such as their KC7t-70m-3.5m-50-720a.  Table 4-1 contains a list of test
equipment used to generate the characterization plots of section 4.0.  The characterization
frequency plots were generated by performing a 32k FFT on 32k data samples collected
from the receiver.

Sample Clock

Source

Signal

Source

Receiver

Bandpass

Figure 4-17 Characterization Setup



Use a narrow bandpass filter between the signal generator
and receiver card to accurately characterize system.

Table 4-1 Characterization Test Equipment

Function

Part Number

Manufacturer

Sample Clock Source

HP8648B

Agilent

Signal Bandpass Filter (one of several) KC7t-70m-3.5m-50-720a

TTE

Signal Source

HP8648B

Agilent

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Summary of Contents for Front End 000-009

Page 1: ...Publication No REF 000 009 R00 Red Rapids Front End 000 009 Dual 16 Bit 310 Msps Receiver Reference Manual 797 North Grove Rd Suite 101 Richardson TX 75081 Phone 972 671 9570 www redrapids com ...

Page 2: ...oducts are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment This product is not designed authorized or warranted for use in a life support system or other critical application All trademark and registered trademarks are the property of their respective owners Copyright 2016 Red Rapids Inc All rights reserved ...

Page 3: ...nly 4 2 4 ADC Configuration 5 2 4 1 ADC Hardware Interface 5 2 4 1 ADC Control Interface 6 2 4 1 ADC Clock Interface 6 2 4 2 ADC Data Interface 6 3 0 Specifications 7 3 1 Input Levels 7 3 2 Performance 8 3 2 1 AC Coupled Performance 8 3 2 2 DC Coupled Performance 9 3 3 Absolute Maximums 9 4 0 Typical Performance Characteristics 10 4 1 AC Coupled 10 4 2 DC Coupled 13 4 3 Generating Characterization...

Page 4: ...Figure 4 5 125 17 MHz 2 0dBFS 12 Figure 4 6 Terminated Input 12 Figure 4 7 Two tones 19 5 and 20 5 MHz at 7dBFS 12 Figure 4 8 Two tones 124 5 and 125 5 MHz at 8dBFS 12 Figure 4 9 DC Coupled Passband Profile DC to 600 MHz 13 Figure 4 10 DC Coupled Passband Profile DC to 260 MHz 13 Figure 4 11 20 17 MHz 1 dBFS 14 Figure 4 12 70 17 MHz 1 dBFS 14 Figure 4 13 125 17 MHz 1dBFS 14 Figure 4 14 Terminated ...

Page 5: ...xt shown in this format is a warning It describes a situation that could potentially damage your equipment Please read each warning carefully The following are acronyms used in this manual AC Alternating Current Greater than 0 Hertz ADC Analog to Digital Converter DAC Digital to Analog Converter dB Decibels dBFS Decibels Relative to Full Scale dBm Decibels Relative to One milliwatt DC Direct Curre...

Page 6: ...e information A block diagram of the receiver is shown in Figure 2 1 The receiver consists of two independent analog input channels labeled 1 and 2 A receiver channel consists of a front panel SMA connector an optional signal conditioning filter and a coupling mechanism AC or DC that bridges the analog input to the ADC Analog inputs are digitized by a dual ADC that creates discrete data samples an...

Page 7: ... coupled as a build option as shown in Figure 2 2 AC coupled units typically offer better high frequency performance and SNR at the expense of low frequency operation DC coupled units provide for good mid low frequency operation down to DC with the expense of added noise and distortion from the coupling amplifier AC units block DC signal content with a 0 1 uF series capacitor and are transformer c...

Page 8: ...t while DAC B controls negative offset Channel 2 has the opposite structure DAC B offsets the ADC input voltage in a positive direction while DAC A offsets the ADC input in a negative direction Trim DAC register settings can be found in the device data sheet listed in section 5 0 The receiver trim DACs are accessed through the Control Interface via a SPI bus as shown in Figure 2 4 Only one of the ...

Page 9: ...onnections clock inputs and control data interfaces accessible to the user Operational modes are described in the ADC device data sheet listed in section 5 0 2 4 1 ADC Hardware Interface Selected ADC component physical pin connections are shown in Figure 2 5 The figure shows logical connection of the RX channel interface and individual discrete control pins described in the device data sheet liste...

Page 10: ...rface 2 4 1 ADC Clock Interface The receiver ADC clock input is sourced by the sample clock distribution network as shown in Figure 2 7 Sample Clock Distribution Network Receiver ADC CLKINP CLKINM Figure 2 7 ADC Clock Interface 2 4 2 ADC Data Interface A diagram of the ADC data interface is shown in Figure 2 8 The interface consists of a forwarded LVDS data clock a 16 bit LVDS interleaved data bus...

Page 11: ...ight on performance variation Table 3 1 Test Environment Item Description Host Personal Computer On carrier in PCIe x8 Slot Air Temperature 25 C Room Cooling Convection Fan Voltage Nominal Typical levels ADC Control Default API from Red Rapids website Clock 310 MHz External Clock 3 1 Input Levels Parameter Min Typ Max Unit Input Impedance ADC Offset Error 1 DC Coupling Offset Error 1 DC Coupled Op...

Page 12: ...25 17 MHz Input 3 74 9 74 1 71 1 dBFS dBFS dBFS SINAD 20 17 MHz Input 70 17 MHz Input 2 125 17 MHz Input 3 74 8 74 1 71 0 dBFS dBFS dBFS SFDR 20 17 MHz Input 70 17 MHz Input 2 125 17 MHz Input 3 95 89 87 dBc dBc dBc Channel to Channel Isolation 25 MHz 50 MHz 75 MHz 100 MHz 90 85 84 81 dB dB dB dB Notes 1 Measured across band using ADC output 2 Performance extrapolated from 4 8 dBFS plot due to tes...

Page 13: ...DC output 3 3 Absolute Maximums Stresses above those listed in Table 3 2 may cause damage to the unit The operation of the unit at these or any other conditions outside of those indicated in the operating sections of this specification is not implied Exposure to absolute maximum conditions for extended periods may degrade unit reliability Table 3 2 Absolute Maximum Specifications Parameter Min Typ...

Page 14: ...ed subsections Each sine input is characterized using a 32k point FFT 4 1 AC Coupled The following receiver plots were taken with the receiver configured for the AC coupled build option with the input filter bypassed 12 10 8 6 4 2 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 740 AC Coupled Passband Res...

Page 15: ...pids Page 11 2 5 2 1 5 1 0 5 0 0 20 40 60 80 100 120 140 160 180 200 220 240 AC Coupled Passband Response dBFS 250 MHz Span Figure 4 2 AC Coupled Passband Profile 1 MHz to 300 MHz Figure 4 3 20 17 MHz 1 0dBFS Figure 4 4 70 17 MHz 4 8 dBFS ...

Page 16: ...blication No REF 000 009 R00 Red Rapids Page 12 Figure 4 5 125 17 MHz 2 0dBFS Figure 4 6 Terminated Input Figure 4 7 Two tones 19 5 and 20 5 MHz at 7dBFS Figure 4 8 Two tones 124 5 and 125 5 MHz at 8dBFS ...

Page 17: ... 8 7 6 5 4 3 2 1 0 0 20 40 60 80 100120140160180200220240260280300320340360380400420440460480500520540560580600 DC Coupled Passband Response dBFS 600 MHz Span Figure 4 9 DC Coupled Passband Profile DC to 600 MHz 1 8 1 6 1 4 1 2 1 0 8 0 6 0 4 0 2 0 0 20 40 60 80 100 120 140 160 180 200 220 240 260 DC Coupled Passband Response dBFS 260 MHz Span Figure 4 10 DC Coupled Passband Profile DC to 260 MHz ...

Page 18: ...Red Rapids Page 14 Figure 4 11 20 17 MHz 1 dBFS Figure 4 12 70 17 MHz 1 dBFS Figure 4 13 125 17 MHz 1dBFS Figure 4 14 Terminated Input Figure 4 15 Two tones 19 5 and 20 5 MHz at 7dBFS Figure 4 16 Two tones 69 5 and 70 5 MHz at 7dBFS ...

Page 19: ...erator phase noise input into the receiver Red Rapids characterization plots were created using 5 bandwidth 7 section Chebyshev filters with 55 dB of stop band rejection We used filters from TTE such as their KC7t 70m 3 5m 50 720a Table 4 1 contains a list of test equipment used to generate the characterization plots of section 4 0 The characterization frequency plots were generated by performing ...

Page 20: ...isted in Table 5 1 Device datasheets can be downloaded from vendor websites for more information Table 5 1 Key Hardware Components Component Part Number Vendor Comments Receiver ADC AD9652BBCZ 310 Analog Devices Dual 16 bit 310 Msps A D Converter Trim DAC LTC1661CMS8 PBF Linear Technology Dual 10 bit Micropower DAC ...

Page 21: ...dlines and time is of the essence in development and production cycles We will make every effort to resolve problems as quickly as possible Web www redrapids com Email support redrapids com Phone 972 671 9570 Fax 972 671 9572 Please include the following information with your correspondence Contact Information Product Model Host Card or System PC PCI Carrier Single Board Computer Operating System ...

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