CN202772855U - TDR step pulse generator - Google Patents
TDR step pulse generator Download PDFInfo
- Publication number
- CN202772855U CN202772855U CN 201220470292 CN201220470292U CN202772855U CN 202772855 U CN202772855 U CN 202772855U CN 201220470292 CN201220470292 CN 201220470292 CN 201220470292 U CN201220470292 U CN 201220470292U CN 202772855 U CN202772855 U CN 202772855U
- Authority
- CN
- China
- Prior art keywords
- step pulse
- tdr
- model
- pulse generator
- speed switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a TDR step pulse generator. The TDR step pulse generator is characterized by comprising a crystal oscillator, a radio frequency transformer, a super-speed switch and a broadband amplifier, wherein the crystal oscillator, the radio frequency transformer, the super-speed switch and the broadband amplifier are connected in order. The TDR step pulse generator employs the super-speed switch to carry out shaping of common square wave pulse signals and then employs the broadband amplifier to acquire step pulses which meet requirements of a characteristic impedance test of a printed circuit board based on TDR principles, and the outputted step pulses have rising time smaller than or equal to 170ps, an amplitude equal to 3.6v and no overshoot.
Description
Technical field
The utility model relates to step pulse generator among a kind of TDR, is based on the generator of step pulse in the printed wiring board characteristic impedance tester of TDR principle.
Background technology
Time domain reflectometry (TDR) is a kind of method of testing of typical printed wiring board characteristic impedance.Typical TDR system needs one, and amplitude is higher, distortion is less, the step pulse of ultrafast rise time.The rise time of step pulse has determined that the ability of explanation printed wiring board characteristic impedance discontinuity is the accuracy of characteristic impedance change location.If the transfer rate of step pulse signal on printed wiring board is 150m/us, be 2.5cm if require the resolution of printed wiring board characteristic impedance change location, then the rising time of step pulse is answered≤170ps, namely processes bandwidth up to 6GHz.
A kind of step pulse generator that the utility model proposes, system utilizes common crystal oscillator to produce the common square-wave pulse signal of a certain fixed frequency, by the ultrahigh speed switch this common square-wave pulse signal is carried out shaping, thereby obtain the step pulse of ultrahigh speed rise time, through wide-band amplifier this step pulse is amplified to again and satisfies the printed wiring board characteristic impedance and test needed level.
Summary of the invention
The purpose of this utility model is for the printed wiring board characteristic impedance test request based on the TDR principle, the generator of the TDR step pulse of a kind of ultrafast rise time is provided, its rise time≤170ps, amplitude=3.6V, without overshoot, to realize the low cost test to the printed wiring board characteristic impedance.
For achieving the above object, the technical solution adopted in the utility model is as follows:
Step pulse generator among a kind of TDR comprises crystal oscillator, radio freqnency transformer, ultrahigh speed switch and wide-band amplifier, and described crystal oscillator, radio freqnency transformer, ultrahigh speed switch are connected with wide-band amplifier and are connected.
Described crystal oscillator is that model is the crystal oscillator of R3306.
Described radio freqnency transformer is that model is the radio freqnency transformer of ADT1-1.
Described ultrahigh speed switch is that model is the ultrahigh speed switch of NBSG72A.
Described wide-band amplifier is that model is the wide-band amplifier of ERA-2+.
Other crystal oscillators or also can be applicable to the utility model with as long as the element that crystal oscillator plays same function can be realized the described function of crystal oscillator described in the specification.
Other radio freqnency transformers, ultrahigh speed switch, wide-band amplifier, if the element that perhaps plays same function with radio freqnency transformer, ultrahigh speed switch, wide-band amplifier can realize function described in the specification also can be applicable to the utility model.Step pulse rise time≤the 170ps of the output of described wide-band amplifier, amplitude=3.6v is without overshoot.
Step pulse generator system adopts the ultrahigh speed switch that common square-wave pulse signal is carried out the step pulse that shaping obtains the ultrafast rise time among the TDR of the present utility model.
For satisfying the ultrahigh speed switch to polarity and the amplitude requirement of input signal, among the TDR of the present utility model the step pulse generator adopt radio freqnency transformer with common square-wave pulse signal by LVTTL(LowVoltageTransistor-TransistorLogic) level signal is transformed to LVDS(LowVoltageDifferentialSignaling) the differential level signal.
For guaranteeing printed wiring board characteristic impedance test to the requirement of described step pulse level, the step pulse generator adopts wide-band amplifier that described step pulse is amplified to certain level and satisfies its requirement to the rise time among the TDR of the present utility model.
The utility model produces the common square-wave pulse signal of a certain fixed frequency with common crystal oscillator, by the ultrahigh speed switch this common square-wave pulse signal is carried out shaping, after the shaping from the step pulse that is of ultrahigh speed switch output, its rise time is amplified to this step pulse signal with wide-band amplifier and satisfies the level that needed rise time≤170ps, amplitude=3.6V are tested in the printed wiring board characteristic impedance less than 55ps.
The beneficial effects of the utility model are:
Step pulse generator among a kind of TDR of the present utility model namely adopts the ultrahigh speed switch that common square-wave pulse signal is carried out shaping, amplifies the step pulse that obtains to satisfy based on the printed wiring board characteristic impedance test of TDR principle through the broadband again.Step pulse rise time≤the 170ps of output, amplitude=3.6v is without overshoot.
Description of drawings
Fig. 1 is theory diagram of the present utility model.
Fig. 2 a is the waveform schematic diagram of a node among Fig. 1.
Fig. 2 b is the waveform schematic diagram of b node among Fig. 1.
Fig. 2 c is the waveform schematic diagram of c node among Fig. 1.
Fig. 2 d is the waveform schematic diagram of d node among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described:
Such as Fig. 1, step pulse generator among a kind of TDR comprises crystal oscillator, radio freqnency transformer, ultrahigh speed switch and wide-band amplifier.Described crystal oscillator, radio freqnency transformer, ultrahigh speed switch are connected with wide-band amplifier and are connected.Crystal oscillator is that model is the crystal oscillator of R3306.Radio freqnency transformer is that model is the radio freqnency transformer of ADT1-1.The ultrahigh speed switch is that model is the ultrahigh speed switch of NBSG72A.Wide-band amplifier is that model is the wide-band amplifier of ERA-2+.Step pulse rise time≤the 170ps of the output of wide-band amplifier, amplitude=3.6v is without overshoot.
Such as Fig. 2 a to Fig. 2 d, (accompanying drawing waveform such as Fig. 2 are a) to produce the LVTTL level square-wave pulse signal of 4.096MHz frequency with common crystal oscillator R3306, this LVTTL level square-wave pulse signal is converted to the differential signal of LVDS level through radio freqnency transformer ADT1-1, (waveform such as Fig. 2 b), by ultrahigh speed switch NBSG72A the differential signal of LVDS level is carried out shaping, after the shaping from the step pulse that is of ultrahigh speed switch output, its rising edge is less than 55ps, amplitude 400mv(waveform such as Fig. 2 c), with wide-band amplifier ERA-2+ this step pulse signal is amplified again, step pulse rise time≤the 170ps of output, amplitude=3.6v(waveform such as Fig. 2 d), satisfy the printed wiring board characteristic impedance and test needed rise time and level requirement.
In sum, step pulse generator among a kind of TDR disclosed in the utility model namely adopts the ultrahigh speed switch to common square-wave pulse shaping, amplifies with wide-band amplifier, thereby is met the step pulse of printed wiring board characteristic impedance test request.
Need to prove; above-described specific implementation method only is the better a kind of method of the utility model; can not be interpreted as the restriction to the utility model protection range; do not breaking away under the utility model design prerequisite, any impartial the variation with modification that the utility model is done all belongs to protection range of the present utility model.
Embodiment recited above is described preferred implementation of the present utility model; be not that design of the present utility model and scope are limited; do not breaking away under the utility model design concept prerequisite; common engineers and technicians make the technical solution of the utility model in this area various modification and improvement; all should fall into protection range of the present utility model, the technology contents that the utility model is asked for protection all is documented in claims.
Claims (6)
1. step pulse generator among the TDR is characterized in that comprising crystal oscillator, radio freqnency transformer, ultrahigh speed switch and wide-band amplifier, and described crystal oscillator, radio freqnency transformer, ultrahigh speed switch are connected with wide-band amplifier and are connected.
2. step pulse generator among the TDR according to claim 1 is characterized in that described crystal oscillator is that model is the crystal oscillator of R3306.
3. step pulse generator among the TDR according to claim 1 is characterized in that described radio freqnency transformer is that model is the radio freqnency transformer of ADT1-1.
4. step pulse generator among the TDR according to claim 1 is characterized in that described ultrahigh speed switch is that model is the ultrahigh speed switch of NBSG72A.
5. step pulse generator among the TDR according to claim 1 is characterized in that described wide-band amplifier is that model is the wide-band amplifier of ERA-2+.
6. step pulse generator among the TDR according to claim 1 is characterized in that the step pulse rise time≤170ps of the output of described wide-band amplifier, and amplitude=3.6v is without overshoot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220470292 CN202772855U (en) | 2012-09-14 | 2012-09-14 | TDR step pulse generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220470292 CN202772855U (en) | 2012-09-14 | 2012-09-14 | TDR step pulse generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202772855U true CN202772855U (en) | 2013-03-06 |
Family
ID=47779397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220470292 Expired - Fee Related CN202772855U (en) | 2012-09-14 | 2012-09-14 | TDR step pulse generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202772855U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995183A (en) * | 2014-06-06 | 2014-08-20 | 浪潮电子信息产业股份有限公司 | Method for detecting continuity of wiring impedance of PCB based on rapid pulse response |
-
2012
- 2012-09-14 CN CN 201220470292 patent/CN202772855U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995183A (en) * | 2014-06-06 | 2014-08-20 | 浪潮电子信息产业股份有限公司 | Method for detecting continuity of wiring impedance of PCB based on rapid pulse response |
| CN103995183B (en) * | 2014-06-06 | 2017-06-30 | 浪潮电子信息产业股份有限公司 | A kind of PCB layout impedance continuity detection method based on fast-pulse response |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105044640B (en) | A kind of integrated form controllable local discharge instrument pulse signal generator | |
| CN103822702A (en) | Pulse signal conversion device for acquiring and synchronously triggering sound field measured data of ultrasonic phased array energy converter | |
| CN202794512U (en) | Sensitivity testing device of secondary radar digital receiver | |
| De Angelis et al. | Characterization and modeling of an experimental UWB pulse-based distance measurement system | |
| CN202772855U (en) | TDR step pulse generator | |
| CN203720221U (en) | Calibration pulse generation device for detecting partial discharge of high voltage device | |
| CN103532529B (en) | The electromagnetic pulse noise suppressing method detected for magnetoacoustic signals and device thereof | |
| CN105548641A (en) | Waveform triggering device and method and oscilloscope for waveform triggering | |
| CN106911408A (en) | A kind of calibration method for calibrating repeater-transmitter group delay | |
| CN204241102U (en) | Based on the transformer vibration monitoring verification platform of DDS | |
| CN203825088U (en) | Harmonic-wave detection device | |
| CN203554398U (en) | Power signal source used for testing anti-interference performance of industrial control communication system | |
| CN203930003U (en) | A kind of simulating signal excitation system for chip detection | |
| CN105281715A (en) | Power-frequency synchronization depth storage ns-grade pulse multi-parameter generation system | |
| CN104931996A (en) | Signal conditioning system of large-dynamic short pulses in radiation detection | |
| CN106896270A (en) | A kind of measuring method of transmission line impedance | |
| CN205142160U (en) | Synchronous degree of depth storage ns level pulse many reference amounts generator of power frequency | |
| CN201382975Y (en) | Phase noise tester | |
| CN103809089A (en) | Method and device for generating calibration pulse for detecting partial discharge of high voltage equipment | |
| CN203101524U (en) | High voltage fast pulse measurement mechanism | |
| CN103954818A (en) | Universal oscilloscope with storage function | |
| CN206057557U (en) | A kind of active automatic calibration test system for mutually sweeping component | |
| CN203054096U (en) | Apparatus for calibrating pulse current | |
| De Angelis et al. | Experimental low-cost short pulse generators | |
| US7224160B1 (en) | RF and pulse bias tee |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160621 Address after: 211106, 3 Nanjing, Jiangning economic and Technological Development Zone, Jiangsu, Patentee after: JOINT STARS TECHNOLOGY Co.,Ltd. Address before: 211100 Nanjing, Jiangsu province Jiangning District 3128 printing Avenue Patentee before: JOINT POWER TECHNOLOGY Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130306 Termination date: 20210914 |