CN202353658U - Oscillograph video triggering device - Google Patents
Oscillograph video triggering device Download PDFInfo
- Publication number
- CN202353658U CN202353658U CN2011205255583U CN201120525558U CN202353658U CN 202353658 U CN202353658 U CN 202353658U CN 2011205255583 U CN2011205255583 U CN 2011205255583U CN 201120525558 U CN201120525558 U CN 201120525558U CN 202353658 U CN202353658 U CN 202353658U
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- oscillograph
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Abstract
The utility model discloses an oscillograph video triggering device, which comprises a programmed gain amplifier, a polarity selector, a peak detector, a low pass filter, an A/D converter, a CPU and a synchronism separator, wherein the input end of the programmed gain amplifier is connected with a video input signal, and the output end of the programmed gain amplifier is connected with the polarity selector; the output end of the polarity selector is respectively and electrically connected with the synchronism separator and the peak detector; the output end of the peak detector is electrically connected with the A/D converter via the low pass filter; the A/D converter is electrically connected with the CPU; and the output end of the CPU is electrically connected with the programmed gain amplifier. The oscillograph video triggering device provided by the utility model has the advantages that the video trigger of an oscillograph is more stable by adopting programmed gain to control video signal amplitude; and besides, the oscillograph video triggering device has the advantages that the circuit is stable, the debugging is simple, and operation parameters can be modified without changing hardware.
Description
Technical field
The utility model relates to the oscilloscope trigger equipment, especially relates to the video triggered equipment that is used for digital oscilloscope.
Background technology
Based on the needs of observing vision signal, most of digital oscilloscope all has video and triggers function.The core component that video triggers is a sync separator, and these parts are packaged into application-specific integrated circuit by numerous IC manufacturer, on market, are seen everywhere.On usage; Only need to send into sync separator to the vision signal of certain amplitude scope; Sync separator can be seen stable synchronizing signal separation off; Offer oscilloscope interrelated logic circuit to these synchronizing signal separations as triggering opportunity, oscilloscope can realize that various videos trigger according to being provided with.In different places; The amplitude size of vision signal is different; Add that oscilloscope can artificially regulate factors such as measuring range again, this possibly not satisfy its parameter request and cause operation irregularity with regard to the signal amplitude that causes sending into sync separator, thereby causes vision signal not triggered by stable.Therefore, on the basis that existing sync separator application-specific integrated circuit can be used, for oscilloscope manufacturer, the problem that the video circuits for triggering will solve is exactly the signal amplitude problem.
Amplitude to vision signal is controlled; The general adjusting parts that adopt voltage control Amplifier as signal gain; With peak-detector circuit the output signal of voltage control Amplifier is carried out peak detection; Output after the detection is the direct current signal of a pulsation, sends into a comparator to the direct current signal of this pulsation and a reference level compares, and the output of comparator connects a low-pass filter circuit; Through the control voltage of the signal voltage behind the LPF, thereby form the amplitude that a closed loop is come stabilization signal as voltage control Amplifier.Adopt the shortcoming of said method to be: vision signal finally feeds back to the voltage controlled gain control end from outputing to of voltage control Amplifier, and a very long deferring procedure is arranged, and causes feeding back periodically concussion of blunt formation easily; If letting, the filtering parameter of change low pass filter postpones the smaller feedback sensitivity that improves; Voltage controlled gain control voltage will have the ripple appearance so; Thereby cause the output of voltage control Amplifier also to be fluctuateed, cause the signal quality variation of giving sync separator along with the fluctuation of control voltage.
In fact, sync separator has an area requirement rather than absolute value to the size of signal amplitude, and is under the situation that satisfies the amplitude range requirement, more important in fact to stable signal of not shaking of sync separator input.
Summary of the invention
The utility model purpose is through improving the mode of signal quality and stable amplitude a kind of more stable oscilloscope video triggered equipment to be provided.
For realizing above-mentioned purpose, the utility model can be taked following technical proposals:
The described oscilloscope video triggered equipment of the utility model, it comprises gain-programmed amplifier, polarity selector, peak detector, low pass filter, A/D analog to digital converter, CPU and sync separator; The input of said gain-programmed amplifier connects video input signals, and its output is electrically connected with polarity selector; The output of said polarity selector is electrically connected with sync separator and peak detector respectively; The output of said peak detector is electrically connected with the A/D analog to digital converter through low pass filter; Said A/D analog to digital converter is electrically connected with CPU; Said CPU output is electrically connected with the gain control end of gain-programmed amplifier.
The utility model advantage is to be implemented under the situation that satisfies amplitude requirement, imports a stable signal of not shaking, thereby forms the signal amplitude of a closed-loop stabilization.This device carries out program control adjusting gain size according to the requirement whether amplitude of exporting signal satisfies sync separator; When amplitude output signal meets the demands; Let signal be in a real stable status under the current gain prerequisite not changing; Have only when signal amplitude and expectation amplitude are critical, be adjusted to signal amplitude the scope of requirement once more.Simultaneously, the utlity model has that circuit is stable, debugging is simple, need not change the advantage that hardware can the modification parameter etc.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model.
Embodiment
As shown in Figure 1, the described oscilloscope video triggered equipment of the utility model, it comprises gain-programmed amplifier, polarity selector, peak detector, low pass filter, A/D analog to digital converter, CPU and sync separator; The input of said gain-programmed amplifier connects video input signals, and its output is electrically connected with polarity selector; The output of said polarity selector is electrically connected with sync separator and peak detector respectively; The output of said peak detector is electrically connected with the A/D analog to digital converter through low pass filter; Said A/D analog to digital converter is electrically connected with CPU; Said CPU output is electrically connected with the gain control end of gain-programmed amplifier.
The utility model operation principle is following:
Gain-programmed amplifier amplifies by program control setting gain video input signals, and the signal after the amplification gets into polarity selector.Because the signal that CRO coupling inserts possibly be that positive polarity also possibly be reversed polarity; And sync separator is that specific requirement is arranged to the polarity of signal; Therefore need a negative circuit to original signal anti-phase 180 degree; Like this, no matter the signal polarity that inserts of probe is just or instead, and polarity selector always can be at the signal of a suitable polarity of selection between the output of gain-programmed amplifier and the negative circuit output.The signal of polarity selector output offers sync separator, also offers peak detector simultaneously.Peak detector is output as the direct current signal of a pulsation, after this signal process low pass filter filtering, is that a galvanic current is pressed signal.The direct current signal of low pass filter output converts numeral to through the A/D analog to digital converter and offers CPU and judge.Preset two thresholdings in the CPU program, high threshold H and a minimum threshold L are till the numeral that converts to the minimum threshold L that < during minimum threshold L, improves the programmable amplifier gain, up to the numeral that converts to >; When the numeral that converts to>during high threshold H, reduce the programmable amplifier gain, up to the numeral that converts to < till the high threshold H; < < during high threshold H, do not change current gain, trigger equipment is in stable state to the numeral that converts to as minimum threshold L.
Claims (1)
1. oscilloscope video triggered equipment, it is characterized in that: it comprises gain-programmed amplifier, polarity selector, peak detector, low pass filter, A/D analog to digital converter, CPU and sync separator; The input of said gain-programmed amplifier connects video input signals, and its output is electrically connected with polarity selector; The output of said polarity selector is electrically connected with sync separator and peak detector respectively; The output of said peak detector is electrically connected with the A/D analog to digital converter through low pass filter; Said A/D analog to digital converter is electrically connected with CPU; Said CPU output is electrically connected with the gain control end of gain-programmed amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205255583U CN202353658U (en) | 2011-12-15 | 2011-12-15 | Oscillograph video triggering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205255583U CN202353658U (en) | 2011-12-15 | 2011-12-15 | Oscillograph video triggering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202353658U true CN202353658U (en) | 2012-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205255583U Expired - Lifetime CN202353658U (en) | 2011-12-15 | 2011-12-15 | Oscillograph video triggering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202353658U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713172A (en) * | 2012-10-08 | 2014-04-09 | 北京普源精电科技有限公司 | Oscilloscope having improved video triggering function |
| CN110753195A (en) * | 2019-12-25 | 2020-02-04 | 深圳市鼎阳科技股份有限公司 | High-stability video triggering method and digital oscilloscope |
| CN112014611A (en) * | 2020-10-16 | 2020-12-01 | 深圳市鼎阳科技股份有限公司 | Digital oscilloscope and data detection method thereof |
-
2011
- 2011-12-15 CN CN2011205255583U patent/CN202353658U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713172A (en) * | 2012-10-08 | 2014-04-09 | 北京普源精电科技有限公司 | Oscilloscope having improved video triggering function |
| CN103713172B (en) * | 2012-10-08 | 2017-08-25 | 北京普源精电科技有限公司 | It is a kind of that there is the oscillograph for improving video triggering function |
| CN110753195A (en) * | 2019-12-25 | 2020-02-04 | 深圳市鼎阳科技股份有限公司 | High-stability video triggering method and digital oscilloscope |
| CN112014611A (en) * | 2020-10-16 | 2020-12-01 | 深圳市鼎阳科技股份有限公司 | Digital oscilloscope and data detection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |
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| CX01 | Expiry of patent term |