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Summary of Contents for Tektronix TriMode TDP7710
- Page 1 TDP7700 Series TriMode™ Probes Technical Reference Register now! Click the following link to protect your product. www.tek.com/register 077-1427-01...
- Page 2 Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material.
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Page 3: Table Of Contents
Table of Contents Table of Contents List of Figures....................................iv List of Tables....................................v Important safety information................................. vi General safety summary............................... vi Terms in the manual................................vi Terms on the product................................vii Symbols on the product................................vii Theory of operation..................................1 Introduction.................................... 1 Probe components................................1 Probe tips..................................2 Probe input architecture.................................4... -
Page 4: List Of Figures
List of Figures List of Figures Figure 1: TDP7700 Series TriMode probe components........................1 Figure 2: TekFlex active probe tips............................... 3 Figure 3: P77C292MM adapter..............................3 Figure 4: TDP7700 Series TriMode probe input architecture......................4 Figure 5: TDP7700 Series TriMode probe input architecture with the P77C292MM SMA adapter..........7 Figure 6: TriMode input structure.............................. -
Page 5: List Of Tables
List of Tables List of Tables Table 1: Probe tip attenuation factors............................5 Table 2: Rise time and overshoot degradation versus lead length....................17 TDP7700 Series TriMode™ Probes Technical Reference... -
Page 6: Important Safety Information
Important safety information Important safety information This manual contains information and warnings that must be followed by the user for safe operation and to keep the product in a safe condition. General safety summary Use the product only as specified. Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. -
Page 7: Terms On The Product
Important safety information Terms on the product These terms may appear on the product: • DANGER indicates an injury hazard immediately accessible as you read the marking. • WARNING indicates an injury hazard not immediately accessible as you read the marking. •... - Page 8 Important safety information TDP7700 Series TriMode™ Probes Technical Reference viii...
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Page 9: Theory Of Operation
Theory of operation Theory of operation Introduction The TDP7700 Series TriMode Probes are designed for use with 6 Series MSO and newer oscilloscopes. Three TDP7700 Series TriMode Probe models are available with bandwidths from 4 GHz to 10 GHz. 6 Series MSO oscilloscope models are available at comparable bandwidths. -
Page 10: Probe Tips
If the LED is red, disconnect and reconnect the probe to restart the power-on diagnostic sequence. If the symptoms continue, connect the probe to another oscilloscope channel or oscilloscope. If the symptoms remain, return the probe to Tektronix for repair. Main interconnect cable This cable assembly consists of a pair of matched, low-loss coaxial signal cables that carry the acquired signal from the probe head to the probe comp box. -
Page 11: Figure 2: Tekflex Active Probe Tips
The browser tip can be held in place or can be used to make hands-free connections to the DUT when using the Browser Tri-Pod accessory, or a probe positioner, such as the Tektronix PPM203B. The browser includes multiple sets of S- parameters based on the spacing of the tips. -
Page 12: Probe Input Architecture
Theory of operation After connecting the adapter to the flex cable, use the retainer to provide a secure connection to the flex cable to minimize movement or to attach the adapter to the hand’s free tripod. For stacking more than one adapter, use the linkage adapter accessories to secure the P77C292MM adapters together. Probe input architecture Input architecture TDP7700 Series probes feature a new probe architecture that addresses the need for high frequency response with... - Page 13 Theory of operation damping resistor value of approximately 100 Ω also serves to tune the probe tip high frequency response. Following each input damping resistor is a pair of attenuation resistors, Rs and Rp. The attenuation resistor values depend on the specific probe tip attenuation factor design.
- Page 14 B input to ground, or connecting the A input to the signal and the ground input of the probe to the ground input of the DUT. In this situation, Tektronix recommends using A-B mode with the B input connected to ground. Reasons for this recommendation include that with the B input left disconnected, there is a possibility of an interfering signal coupling into the input of the probe and distorting the measured signal acquired on the A side.
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Page 15: Trimode Operation
Theory of operation The following figure shows the simplified diagram of the TDP7700 Series TriMode probe input architecture with the P77C292MM SMA adapter. Because there are no active components within the adapter the A and B inputs are passed through directly to the probe amplifier. Figure 5: TDP7700 Series TriMode probe input architecture with the P77C292MM SMA adapter TriMode operation The TriMode feature of the TDP7700 Series probes is designed for improved convenience and enhanced capability in... -
Page 16: Operating Voltages
Theory of operation • [A+B]/2 - GND (for common mode measurement) Note: In the B – GND Mode, the negative polarity B input is not inverted. The four input amplifiers are multiplexed together and only the selected input mode function is sent to the connected oscilloscope. -
Page 17: Max Non-Desctruct Input Voltage
Theory of operation Figure 7: TekFlex probe tip inputs Max non-desctruct input voltage The maximum input voltage is the maximum voltage to ground that the inputs can withstand without damaging the probe input circuitry. The TekFlex active probe tips include some over-voltage protection circuitry at the probe tip signal inputs. (See Figure 7: TekFlex probe tip inputs on page 9.) Transient voltage suppression diodes, Da and Db, provide bidirectional... -
Page 18: Offset Voltage
Theory of operation Offset voltage The offset voltage control sums an adjustable DC voltage with the probe signal input. It is commonly used to nullify an input DC bias voltage to center the input signal swing within the linear dynamic range of the probe input. The A and B probe inputs both have an independent offset voltage control when used in A mode or B mode respectively. -
Page 19: Figure 9: Simplified Auto Tracking Circuitry
Theory of operation It is additionally possible to turn on an Autotracking function. In C-mode, the autotracking function adjusts the offsets to null out the low-frequency differential input seen by the probe amplifier, maximizing the common-mode dynamic range. In D mode, the autotracking function adjusts the offsets to null out the low-frequency common-mode input seen by the probe amplifier, maximizing the differential dynamic range. -
Page 20: Operating Voltage Window
Theory of operation are buffered by a pair of unity gain amplifiers and passed to the comp box microcontroller ADC conversion inputs. The converted sense signals are transmitted to the oscilloscope when requested by an Auto Offset cycle, where they are processed by the oscilloscope according to the selected Auto Offset mode. -
Page 21: Figure 12: Operating Voltage Window (Common Mode, Flex Tip)
Theory of operation Figure 12: Operating voltage window (common mode, flex tip) Voltage window with P77C292MM SMA adapter The P77C292MM adapter operating voltage window is shown in the following figure. Figure 13: Operating voltage window (P77C292MM SMA adapter) The A operating voltage window range for the adapter of ±4.0 V is shown on the vertical axis and the B operating voltage window range of ±4.0 V is shown on the horizontal axis. -
Page 22: Improving Measurement Accuracy
Theory of operation The P77C292MM adapter has a further dimension that effects the operating window. The V setting influences the term dynamic range. A plot of V and valid input voltages is shown in the Overload Specification section. term Improving measurement accuracy DSP correction filtering TDP7700 Series probes and probe tips use DSP correction filtering to optimize probe measurement fidelity. -
Page 23: Figure 16: P77Stflxa Solder Tip Attached With 10 Mils (0.250 Mm) Wires (Rise Time = 30.5 Ps)
Theory of operation probe tip performance is specified using a test fixture built with a probe tip having a signal wire length of 10 mils (.25 mm) and a ground wire length of 66 mils (1.7 mm). The typical pulse waveforms in the following figures show the effect of input wire length variation on measured responses. Note that these measurements, in these images, were made using a 20 Ghz P7720 probe. -
Page 24: Figure 18: P77Stflxa Solder Tip Attached With 120 Mils (3.05 Mm) Wires (Rise Time = 30.1 Ps)
Theory of operation Figure 18: P77STFLXA solder tip attached with 120 mils (3.05 mm) wires (rise time = 30.1 ps) Figure 19: P77STFLXA solder tip attached with 200 mils (5.08 mm) wires (rise time = 34 ps) Figure 20: P77STFLXA solder tip attached with 300 mils (7.62 mm) wires (rise time = 42.8 ps) The following table shows the rise time and overshoot degradation versus lead length. -
Page 25: Using Offset Voltage To Extend Tekflex® Solder-In Tip Input Voltage Range
Theory of operation Table 2: Rise time and overshoot degradation versus lead length Signal wire lead length 10 - 90 Rise time 20 - 80 Rise time Effective bandwidth 0.25 mm 30.5 ps 21 ps 20 GHz 1.90 mm 27.9 ps 19.3 ps 20 GHz 3.05 mm... -
Page 26: Making Single Ended Measurements Using The P77Brwsr Differential Probe Tip
Theory of operation If a probe tip is attached to a probe but not soldered to anything, the inputs will be open which effectively makes the source resistance look much larger than the 25 kΩ attenuator resistors. As a result, the offset voltage control is no longer calibrated and will have 2X the calibrated effect on the measured probe output. -
Page 27: Figure 23: Example Of Lvds Differential Signal
Theory of operation Figure 23: Example of LVDS differential signal The complementary single-ended signals labeled A and B in the previous figure must have well matched signal timing (for example, low skew) to function as a useful differential signal. If the signal skew becomes comparable in size to the rise time of the complementary signals, then the rise time of the resulting differential signal will be slower than expected. -
Page 28: Reference
Reference Reference This section defines common terms used to specify the instrument. Differential measurements A differential probe is optimized to measure high speed differential signals. Differential signals are formed from two complementary signals with a common reference voltage. (See Figure 24: Simplified model of a differential amplifier on page 20.) Devices designed for differential measurements avoid problems presented by single-ended systems. -
Page 29: Assessing Cmrr Error
Reference The 6 dB term in the AC CMRR equation gives the voltage-referenced response. CMRR generally is highest (best) at DC and degrades with increasing frequency. A typical CMRR plot for a TDP7700 Series probe and a flex circuit-based solder tip is shown. -
Page 30: Figure 26: Typical Channel Isolation
Reference other input, and this effect increases with frequency. Channel isolation is a measure of how much crosstalk occurs between the two probe inputs. The channel isolation is defined with S-parameter measurements below, where: A input = S1, B input = S2, Output = S3 A ISOLATION = 20 log (S ) | A Mode B ISOLATION = 20 log (S... - Page 31 Specifications Specifications These specifications apply to the TDP7700 Series probes when installed on an 6 Series MSO oscilloscope with a bandwidth greater than or equal to 10 GHz. The probe performance may be degraded if a probe is operated using an oscilloscope with bandwidth less than the probe bandwidth.
- Page 32 Specifications 10% - 90% Rise Time Probe Rise time TDP7710 <45 ps TDP7708 <55 ps TDP7706 <65 ps TDP7704 <100 ps 20% - 80% Rise Time Probe Rise time TDP7710 <32 ps TDP7708 <38 ps TDP7706 <46 ps TDP7704 <72 ps Small signal frequency response, Probe Frequency response...
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Page 33: Impedance Graphs
Specifications Operating voltage window, typical Solder-in tips ±5.25 V Browser ±10 V SMA adapter ±4 V Offset voltage range, typical Solder-in tips -4 V to +4 V Browser -10 V to +10 V SMA adapter -4 V to +4 V Input range, typical Solder-in tips Single-ended... -
Page 34: Figure 28: P77Stcabl Se Impedance
Specifications Figure 28: P77STCABL SE impedance Figure 29: P77STFLXA differential impedance Figure 30: PST77FLXA SE impedance TDP7700 Series TriMode™ Probes Technical Reference... -
Page 35: Nominal Characteristics
Specifications Figure 31: P77BRWSR differential impedance Nominal characteristics Weight Probe cable and head 3.5 oz Probe (comp box, cable, 9.6 oz head) Cable length 1.21 m (4.0 feet) Oscilloscope interface FlexChannel Accessory connector TekFlex Environmental Temperature range Compensation box and Operating: 0 °C to +50 °C (32 °F to 122 °F) browser Non-Operating: -20 °C to +60 °C (-4 °F to 140 °F) - Page 36 Specifications Nonoperating 5% to 90% RH (Relative Humidity) at up to +40 °C, 5% to 55% RH above +40 °C up to +60 °C, non-condensing. TDP7700 Series TriMode™ Probes Technical Reference...
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Page 37: Performance Verification
Performance verification Performance verification Test record Test record for TDP7700. Model Serial # Procedure performed by Date System noise Performance checks Noise Horizontal scale Limit Test result Probe TDP7710 4 μs/div ≤ 4.65 mV P77STCABL or P77STFLXA TDP7708 4 μs/div ≤... -
Page 38: Index
Index cable assembly TekFlex connector channel isolation TekVPI interface check noise TriMode operation CMRR assessing CMRR error common-mode rejection ratio comp box wire length correction filtering solder-in tip connection differential measurements Differential-Mode rejection ratio DMRR DSP correction filtering error conditions LED indicators input network input voltage...
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