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Tektronix P7313SMA, Technical Reference

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Operating Basics

Termination Voltage Control

The P7313SMA probe termination voltage can be controlled either internally or externally, as selected by three different
modes. A block diagram of the probe termination network is shown. (See Figure 5.) A discussion of the circuitry follows.

Figure 5: Termination voltage network drive

8

P7313SMA Technical Reference

Summary of Contents for P7313SMA

Page 1: ...P7313SMA 13 GHz Differential Probe Technical Reference P071196800 071 1968 00...

Page 2: ......

Page 3: ...P7313SMA 13 GHz Differential Probe Technical Reference www tektronix com 071 1968 00...

Page 4: ...and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tek...

Page 5: ...duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintena...

Page 6: ......

Page 7: ...19 Deskewing Probes 20 Reference 23 Serial Bus Standards 23 InfiniBand 24 Specifications 25 Warranted Characteristics 25 Typical Characteristics 26 Nominal Characteristics 30 Mechanical Characteristi...

Page 8: ...Table of Contents ii P7313SMA Technical Reference...

Page 9: ...ad to the circuit under test before connecting the probe input Disconnect the probe input and the probe reference lead from the circuit under test before disconnecting the probe from the measurement i...

Page 10: ...es that could result in damage to this product or other property Symbols and Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you...

Page 11: ...e This is the technical reference manual for the P7313SMA differential probe This manual provides operating theory specifications and performance verification procedures for the probe P7313SMA Technic...

Page 12: ...Preface vi P7313SMA Technical Reference...

Page 13: ...and See Figure 14 on page 24 Although the differential response is generally the primary measurement of interest for a differential signal full characterization of the signal also requires measurement...

Page 14: ...tructure It has a dual matched 50 input that is designed to terminate the measured signal transmission path with minimum reflections It is designed specifically for serial compliance testing Its SMA i...

Page 15: ...7 High CMRR in a differential probe requires careful matching of the two input paths Poorly matched signal source impedances can significantly degrade the CMRR of a measurement Mismatches between the...

Page 16: ...tional Accessories Input Termination Network The input termination network in the P7313SMA differential probe includes a pair of attenuation resistor networks laser trimmed to 50 terminations connecte...

Page 17: ...e For specific limits of these parameters see the Specifications section See page 25 Specifications Maximum Input Voltage The maximum input voltage is the maximum voltage to ground that the inputs can...

Page 18: ...terms to be used in the preceding power equations NOTE With a balanced DC signal in the preceding equations VDM is half of the value of a conventional differential signal Figure 3 Probe maximum input...

Page 19: ...e Differential Measurement Topology Figure 4 Differential and Common Mode operating ranges Common Mode Rejection The common mode rejection ratio CMRR is the ability of a probe to reject signals that a...

Page 20: ...oltage can be controlled either internally or externally as selected by three different modes A block diagram of the probe termination network is shown See Figure 5 A discussion of the circuitry follo...

Page 21: ...um DC loading on the input signal source With open inputs or a high DC source impedance such as an AC coupled input signal the Auto mode select LED flashes indicating that the termination voltage has...

Page 22: ...gnals that have a common mode voltage range of 2 5 V Although the termination voltage range is specified to be 3 6 V 2 5 V limitations on the linear current range of the termination voltage driver res...

Page 23: ...on mode signal components The input signal source model includes a common mode component VCM and complementary differential mode components VDM The differential mode signal source models have double t...

Page 24: ...tage with a separate DC common mode range The differential peak to peak voltage specification is different for the two probe attenuation settings but the DC common mode range is the same for both atte...

Page 25: ...tage The measured single ended DC voltage also represents only half the common mode input voltage VCM because of the voltage divider network formed by the four 50 resistors and the differential amplif...

Page 26: ...opology The measured AC voltage VDM is the same for both single ended topologies but the measured DC voltage is affected by both the common mode input voltage VCM and the termination voltage VT In the...

Page 27: ...nd loading of this topology are also shown Figure 10 Open input The measured single ended response for this topology has the same AC voltage VDM as the other topologies but has a common mode voltage t...

Page 28: ...ltage should be set to the voltage measured in the first step This can be done easily in Int mode but requires a TekConnect oscilloscope that has support for probe termination voltage select Setting t...

Page 29: ...If an external attenuator is used its attenuation accuracy must be taken into account when factoring the impact on measurement accuracy The increase in attenuation also brings an increase in noise Ex...

Page 30: ...e Skew between the two outputs can be compensated with the TDR module deskew control Refer to your sampling head or oscilloscope manual for instructions 3 Connect the matched cable pair to the TDR out...

Page 31: ...pplied with the probe the initial delay mismatch should be less than 25 ps 1 Connect the phase adjusters to the cables 2 On the cable with the longer delay loosen the phase adjuster locking nuts set t...

Page 32: ...pairs of the oscilloscope If you need to deskew more than two probes keep one deskewed probe connected to the sampling head as a reference after deskewing two probes and deskew additional probes to t...

Page 33: ...deskew control window 13 In the Channel box select the channel that you want to deskew to Channel 1 NOTE If possible do the next step at a signal amplitude within the same attenuator range vertical s...

Page 34: ...Operating Basics 22 P7313SMA Technical Reference...

Page 35: ...I 1 65 Gb s 800 mV 150 mV 3 3 V 2 8 V InfiniBand TX 2 5 Gb s 1 6 V 1 0 V 1 0 V 0 5 V InfiniBand RX 2 5 Gb s 1 6 V 0 175 V 1 0 V 0 5 V PCI Express TX 2 5 Gb s 1 2 V 0 8 V AC AC PCI Express RX 2 5 Gb s...

Page 36: ...th operating at a 2 5 Gb s rate As shown in the example below the differential output parameter is specified as a peak to peak voltage difference and thus the signal swing on each pin of the driver is...

Page 37: ...p in 2 5X attenuation 500 mV differential step in 12 5X attenuation Differential signal range 0 800 Vp p 2 5X attenuation 3 6 Vp p 12 5X attenuation DC gain Main output 0 40 2 0 corresponds to 2 5 X a...

Page 38: ...67 1 Termination voltage driver current 82 5 mA 8 mA overload Common mode DC input signal range 3 6 V 2 5 V Common mode input return loss 35 dB 500 MHz VSWR 1 06 1 20 dB 6 5 GHz VSWR 1 22 1 15 dB 10...

Page 39: ...DC voltage measurement accuracy referred to input 2 of input 8 00 mV 8 00 mV 2 5 X 2 of input 36 00 mV 36 0 mV 12 5 X gain error 2 of input voltage output zero offset referred to input 8 00 mV 2 5 X 3...

Page 40: ...return loss plot for the probe See Figure 16 Figure 16 Typical differential input return loss Typical differential mode bandwidth plot for the probe See Figure 17 Figure 17 Typical differential mode...

Page 41: ...eye pattern as measured with the probe See Figure 18 Figure 18 Typical eye pattern Typical step response as measured with the probe See Figure 19 Figure 19 Typical differential step response P7313SMA...

Page 42: ...50 1 internally per side Termination voltage input configuration DC two 0 080 in jacks and Termination voltage buffer input resistance 100 K Termination voltage output monitor DC two 0 040 in jacks a...

Page 43: ...cal dimensions are shown See Figure 20 Table 7 Typical mechanical characteristics Dimensions 48 0 mm 31 8 mm 129 5 mm 1 9 in 1 3 in 5 1 in Unit weight 230 g 0 51 lb Shipping weight includes shipping m...

Page 44: ...width Tektronix 80E08 Sampling Module 20 GHz bandwidth Tektronix 80E04 TekConnect Probe Interface Module with semi rigid cable Firmware version V2 2 or above Tektronix 80A03 with 174 4857 xx cable DMM...

Page 45: ...cluded with the probe 3 One adapter is included with the probe Special Adapters Required Some of the adapters listed in the previous table are available only from Tektronix These adapters are describe...

Page 46: ...e See Figure 22 2 Connect the 80E04 module to the 80A03 TekConnect probe interface 3 Connect the 80E08 module to channels 7 and 8 of the TDS8000 oscilloscope 4 Connect a 50 termination to the Aux Outp...

Page 47: ...inputs and gently probe the center contacts of the input connectors Be careful not to touch the outer edge ground of the connector See Figure 23 4 Measure the resistance and write down the value 5 Rev...

Page 48: ...e 24 1 Plug the probe directly into an oscilloscope channel and set the Vterm Source Select to EXT on the probe Figure 24 Termination Voltage Accuracy Ext mode setup 2 Connect the 50 terminations on t...

Page 49: ...you use a graphical user interface in the oscilloscope to set the test values to the 0 000 2 500 and 2 500 volt levels instead of using external power supplies You do not need to measure these values...

Page 50: ...Auto mode setup 2 Set the Vterm Source Select to Auto on the probe 3 Set the power supply as close as practical to 0 000 volts and use the DMM to measure this input voltage at the terminals on the po...

Page 51: ...lug the probe into the 80A03 module 3 Connect the cable from the DMM to the SMA connector that is located below the 80A03 channel that you plugged the probe into Figure 26 Setup for the output offset...

Page 52: ...ne of the DMMs Figure 27 DC Gain Accuracy setup 3 Set the voltage on each power supply to approximately 0 160 V 0 32 V differential total This represents 80 of the probe dynamic range in this attenuat...

Page 53: ...10 Verify that the gain is 0 4 2 0 11 Record the calculated gain for the 2 5X setting on the test record Gain Check at 12 5X Attenuation 12 Set the attenuation on the probe to 12 5X 13 Repeat steps 2...

Page 54: ...combination can be used However the TDR rise times required of the sampling heads in this test are only available on 80E08 and 80E10 sampling heads This test checks both of the probe attenuation sett...

Page 55: ...lling 5 Set the Channel 8 C8 Polarity to positive rising 6 Set the Preset of Channel 7 and 8 on TDR Preset sets Internal Clock in the Trigger menu turns on the TDR Step in the TDR Setups menu turns on...

Page 56: ...ition the step as shown See Figure 31 Save this waveform to a reference Figure 31 Deskew the TDR steps 12 Remove Ch 7 from the Ch 4 input and connect Ch 8 to the Ch 4 input 13 Press the Ch 4 button to...

Page 57: ...should now be connected as shown See Figure 32 21 Expand the horizontal scale to help locate the step edge and then adjust horizontal range to 50 ps div while maintaining the edge view For a more sta...

Page 58: ...will need to set the step offset to 25 mV and vertical scale to 10 mV div in the procedure 3 Measure a new system time by repeating steps 1 through 16 of the 12 5X attenuation check 4 Remove the TekC...

Page 59: ...t______ Vin 7 mV Vin 2 500 V Vin 7 mV Vin______Vout______ Vin 7 mV Int Mode Vin 0 000 V 0 002 V Vout 0 002 V Vin 2 500 V 2 4905 V Vout 2 5095 V Vin 2 500 V 2 4905 V Vout 2 5095 V Auto Mode Vin 0 000 V...

Page 60: ...our probe have a 1 ps skew at the cable ends Tektronix part number 015 0708 XX package of 1 80A03 The 80A03 TekConnect Probe Interface Module is an adapter that allows you to use TekConnect probes wit...

Page 61: ...erage for the designated calibration interval whichever comes first Option D3 Calibration Data Report 3 years with Option C3 Option C3 Calibration Service 3 years Option D5 Calibration Data Report 5 y...

Page 62: ...propyl alcohol solution as a cleanser and rinse with deionized water Replacement Parts Due to the sophisticated design of the P7313SMA differential probe there are no user replaceable parts within the...

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