CN201904788U - Signal detection device - Google Patents
Signal detection device Download PDFInfo
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- CN201904788U CN201904788U CN2010206806339U CN201020680633U CN201904788U CN 201904788 U CN201904788 U CN 201904788U CN 2010206806339 U CN2010206806339 U CN 2010206806339U CN 201020680633 U CN201020680633 U CN 201020680633U CN 201904788 U CN201904788 U CN 201904788U
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Abstract
The utility model discloses a signal detection device, which is characterized by comprising a gain module, an operation module and a comparison module, wherein an adjuster for magnifying difference module signals in input differential signals through adjustment and transmitting a common mode reference value followed in the input differential signals to the operation module, is arranged in the gain module; and the operation module firstly converts the common mode reference value into upper/lower limit threshold voltage as well as the magnified difference module signals into a DC parameter simultaneously, and finally obtains an LOS (Lost Of Signal) warning in the comparison module by performing a hysteresis comparison to the DC parameter and the upper/limit threshold voltage. In the signal detection device, an adjuster in a variable gain amplifier can perform an LOS judgment according to the different upper/lower limit threshold voltages obtained by adjusting the difference module signal gain, so that an LOS detection criterion with a multi-level specification can be satisfied, the temperature compensation is achieved, the parameter drift is overcome at the same time, and the circuit working condition and the hysteresis coefficient stability are good.
Description
Technical field
The utility model relates to a kind of signal supervisory instrument.
Background technology
Widely applied the technology of high speed transmission of signals in high-speed communication system, these application must comprise signal supervisory instrument.This checkout gear is used to monitor the amplitude of digital signal, and when its amplitude is lower than a certain set point, being judged to be transmission signals loses, provide the alarm of dropout simultaneously, so that other signal processing apparatus can be used as foundation and in time signal parameter revised, thereby keep the continuity of transmission information.
At present in digital data transmission, the various protocols standard to describe the has been arranged digital signal level standard of different demands, common such as level standards such as PECL/CMOS/TTL, its amplitude of oscillation of logic level of these standard institute standards is all variant.Therefore, the criterion of its dropout of logic level of these various criterions is all different.For signal supervisory instrument, so demand has just been arranged, make that signal supervisory instrument can compatible these common level standard signals; And its cost and structure all can not be too high or complicated, by simple setting, realize regulating reliably satisfying this compatibility.
The utility model content
At the low-cost highly compatible of above signal supervisory instrument and the requirement of reliability, the utility model proposes a kind of signal supervisory instrument, its technical scheme is as follows:
A kind of signal supervisory instrument, it comprises:
One gain module; This module has the differential signal input, comprises a variable gain amplifier; This variable gain amplifier has an adjuster and a difference mode signal of regulating described variable gain amplifier gain and amplifies output; This module also comprises a common-mode voltage follower, and this common-mode voltage follower has a common mode with reference to output;
One computing module; This module has a threshold value maker, and this threshold value maker connects described common-mode reference output, has a corresponding upper limit and a lower limit threshold value output; This module also has an amplitude converter, and this amplitude converter connects described difference mode signal and amplifies output, has direct current parameter output; And
One comparison module; This module connects described upper and lower limit threshold value output and described direct current parameter output, has the loss of signal alarm output simultaneously.
Preferred person as the utility model scheme, can do following improvement:
The described adjuster of one preferred embodiment comprises that one is connected the resistor voltage divider network between power supply and the ground.
Variable gain amplifier in the described gain module of one preferred embodiment comprises the differential amplifier of a plurality of cascades, and this multistage differential amplifier is except that the last level, and all the other are at different levels all to have adjustable active load.
The described differential amplifier of one preferred embodiment has identical structure, and this structure comprises: the drain electrode of MOS differential pair tube is connected to power end by a drain resistance separately; By a tail constant-current source ground connection, this tail constant-current source is the metal-oxide-semiconductor that is operated in the saturation region to the source electrode of described differential pair tube jointly;
The described active load of one preferred embodiment is realized by the both-end output that its source drain of metal-oxide-semiconductor that is operated in the saturation region is connected across differential pair; The MOS differential pair tube grid of first order differential amplifier is as the differential signal input; The both-end output of end one-level differential amplifier is amplified output as differential mode;
The grid of all active loads links to each other, and connects the grid of following pipe again, and this follows continuous one first constant-current source that connects again of tube grid drain electrode to ground; Described source electrode of following pipe connects the described output node of described resistor voltage divider network;
Wherein, all described tail current sources are identical with the first constant-current source way of realization, and its all grids link to each other and insert identical bias voltage, all source electrodes ground connection that links to each other.
The described common-mode voltage follower of one preferred embodiment comprises a sample resistance and one second constant-current source, wherein the sample resistance termination power of series connection; The second constant-current source grid links to each other with source electrode with described tail constant-current source grid respectively with source electrode; The described sample resistance and the second constant-current source tie point are as the common-mode reference output.
The described threshold value maker of one preferred embodiment comprises a pseudo-amplitude converter and an arithmetic unit; Described pseudo-amplitude converter connects described common-mode reference output, has a threshold reference end simultaneously and is connected with described arithmetic unit; Described arithmetic unit has described upper and lower limit threshold value output.
The described pseudo-amplitude converter of one preferred embodiment all has the differential pair form of identical topological structure with described amplitude converter.
The described differential pair form of one preferred embodiment comprises: be connected to the differential pair tube of drain resistance separately, this differential pair tube grid separately and drain electrode short circuit; The described drain resistance other end interconnects and is connected to power end by a top constant-current source; Described differential pair tube source electrode links to each other and is connected to ground by one source pole resistance parallel with one another and one source pole electric capacity again; Two grids of the differential pair tube of wherein said amplitude conversion circuit connect described differential mode respectively and amplify output, and two source electrodes transform output as amplitude; One of them grid of the differential pair tube of pseudo-amplitude conversion circuit connects described common-mode reference output; The source electrode of differential pair tube transforms output as pseudo-amplitude, and two differential pair tube drain electrodes link to each other.
The described arithmetic unit of one preferred embodiment comprises a comparator, and one adjusts pipe and first, second and third divider resistance; The source drain of wherein said adjustment pipe and described first, second insert power supply and ground with the 3rd divider resistance back in sequential series, adjust pipe and are positioned at power end, the 3rd divider resistance end ground connection; The negative input end of described comparator connects described pseudo-amplitude and transforms output, and comparator output terminal connects described adjustment tube grid, the tie point of positive input termination described second and the 3rd divider resistance;
The first divider resistance hot end is as the upper limit threshold output, and cold end is as the lower threshold output.
The described hysteresis comparator of one preferred embodiment comprises a comparator and a pair of totem structure metal-oxide-semiconductor, and its totem structure is that PMOS pipe and NMOS pipe drain and the grid realization that links to each other separately; The described amplitude of described comparator positive input termination transforms output, and negative input end connects the drain electrode of described totem structure metal-oxide-semiconductor, the grid of output termination metal-oxide-semiconductor; NMOS pipe source electrode connects described upper limit threshold output simultaneously; PMOS pipe source electrode connects described lower threshold output.
The beneficial effect that the utility model brings is:
1. the adjuster in the variable gain amplifier is adjusted by difference mode signal is gained, and obtains different upper and lower limit threshold voltages as judging according to carrying out dropout, can satisfy the signal loss detection criterion of common many level standard.
2. adopt the adjuster of resistor voltage divider network realization, it is simple in structure, realizes low-cost easily.
3. follow the structure of the pipe and first constant-current source,, so can realize temperature-compensating and overcome the parameter drift that technological reason brings, improve precision, good stability with the similar of active load and tail current source in the multistage differential amplifier.
Amplitude pseudo-amplitude converter have the differential pair form of identical topological structure, so structure also realizes temperature-compensating and overcomes the parameter drift that technological reason brings, raising precision, good stability.
5. the sluggish coefficient of hysteresis comparator is not subjected to the influence of adjuster, is determined by the retaining element of circuit own, therefore can realize accurate and constant sluggish coefficient.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing embodiment:
Fig. 1 is the utility model embodiment one block diagram;
Fig. 2 is the utility model embodiment two gain module circuit diagrams;
Fig. 3 is the utility model embodiment two computing module circuit diagrams;
Fig. 4 is the utility model embodiment two comparison module circuit diagrams.
Embodiment
Embodiment one:
As shown in Figure 1, be the block diagram of the utility model embodiment one.Vin is a differential signal input to be measured; Gain module A comprises the two large divisions, and a part is a variable gain amplifier, wherein has adjuster; Variable gain amplifier partly amplifies output Vo to the difference mode signal output with the differential mode among the differential signal Vin under the control of adjuster; Another part is a voltage follower, and this voltage follower can be exported a common-mode reference value Vcom to the common-mode reference output according to Vo; Wherein, adjuster is regulated by outside resistance R x, realizes determining Vo and Vcom.
Computing module B also comprises the two large divisions, and a part is the amplitude converter, and the difference mode signal Vo that amplifies is converted into a specific direct current parameter Vpeak to direct current parameter output; Another part is the threshold value maker; Determine back grade of upper limit threshold voltage Vde and lower threshold voltage Vas that judges the dropout needs according to Vcom, wherein Vde＞Vas, Vde and the corresponding upper and lower limit threshold value output of Vas difference.
Its inside of comparison module C is done sluggish relatively with Vde and Vas Vpeak, this sluggishness relatively compares rule with general sluggishness, that is: when Vpeak was lower than Vas, alarm output meeting cue was lost, if will remove this alarm signal, Vpeak must be returned to Vde.
Embodiment two:
As shown in Figure 2, the gain module circuit diagram of the utility model embodiment two.First order differential amplifier has comprised R1, R2, M21, M22 and M5, has three grades from the similar as can be known amplifier of figure, and wherein the first order and the second level have the load M2 and the M3 of cross-over connection both-end output; Adjustable resistance Rx among the figure among Set termination such as Fig. 1 embodiment, its R0 and Rx just constitute a resistor voltage divider network; Follow and manage the node that its source electrode of M1 inserts this resistor voltage divider network; The grid of M1 and drain electrode short circuit, and with drain electrode is connected as the M0 of first current source, the grid of while active load M2 and M3 also is connected with the M1 grid.R0, Rx, M0, M1, M2 and M3 have just constituted described adjuster critical piece.When changing the Rx size, the dividing potential drop node voltage of R0 and Rx will change, and by following the pipe M1 and the first constant-current source M0, just can change the AC resistance of M2 and M3 conducting channel, thereby just changed the overall gain of this third stage amplifier, obtained different differential modes from the Vo end and amplify voltage; The R7 and the second constant-current source M8 constitute the critical piece of common-mode voltage follower, and wherein Vcom is as the common-mode reference output.Third level differential amplifier both-end output Vo amplifies output as differential mode simultaneously.
Need to prove, M5, M6 and M7 all are tail constant-current sources of differential amplifier, and equal topological consistent with all tail constant-current sources of first, second constant-current source M0 and M8, such line construction make entire circuit in temperature-compensating and overcome and have good effect aspect the discrete parameter drift that brings of technology because can cancel each other because the caused component parameters drift of temperature or technological reason with the circuit of spline structure.
As shown in Figure 3, the utility model embodiment two computing module circuit diagrams.Top current source M9, drain resistance R8, R9, to pipe M91, M92, source resistance R10 and filter capacitor C8 have constituted the amplitude converter of a differential pair form; Next door top current source M10, has constituted same differential pair form to pipe M101 and M102, source resistance R13 and capacitor C 9 at drain resistance R11, R12, and this is described pseudo-amplitude converter.The grid of M91 and M92 is respectively as the input of differential mode amplifying signal, and M101 and M102 are jointly as the input of common mode reference voltage Vcom.This comparison module also has an arithmetic unit, comprises comparator A1, adjusts pipe M11 and first, second and the 3rd divider resistance R14, R15 and R16.Wherein the R14 hot end is exported as Vde, and cold end is exported as Vas.
As shown in Figure 4, the utility model embodiment two comparison module circuit diagrams.This part promptly is a hysteresis comparator circuit.The positive input termination Vpeak of comparator A2; M12 and M13 constitute the structure of a totem pillar, and the output Loss of comparator A2 is as loss of signal alarm.Usually the status comparator negative input end inserts lower threshold voltage Vas; When Vpeak voltage is lower than Vas, Loss end output high level, the negative input end saltus step of comparator A2 is Vde, and therefore, unless Vpeak gos up once more above Vde, otherwise the Loss end can not replied low level, and loss of signal alarm will continue always.
From Fig. 2, Fig. 3 and embodiment illustrated in fig. 4 two circuit structure, as can be known:
V
de＝V
in，de*A*K
de
V
as＝V
in，as*A*K
as
Wherein, A is the gain of variable gain amplifier, and K is the transformation ratio of amplitude converter, and sluggish coefficient:
Because Vde, Vas, Kas, Kde are default fixed value, so sluggish coefficient and input signal size, the gain of variable gain amplifier is all irrelevant, is a fixed value, is determined by circuit element parameter.
Can find out by embodiment,,, just can realize programming, can also keep sluggish coefficient stable simultaneously lossing signal upper limit of detection threshold value, lower threshold to change the gain of variable gain amplifier by regulating adjustable resistance (Rx among Fig. 1) resistance.
The above only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented according to this.The equivalence of doing according to the utility model claim and description changes and modifies, and belongs to the content of the utility model thinking, all should still belong in the scope that the utility model contains.
Claims (10)
1. signal supervisory instrument is characterized in that it comprises:
One gain module; This module has the differential signal input, comprises a variable gain amplifier; This variable gain amplifier has an adjuster and a difference mode signal of regulating described variable gain amplifier gain and amplifies output; This module also comprises a common-mode voltage follower, and this common-mode voltage follower has a common mode with reference to output;
One computing module; This module has a threshold value maker, and this threshold value maker connects described common-mode reference output, has a corresponding upper limit and a lower limit threshold value output; This module also has an amplitude converter, and this amplitude converter connects described difference mode signal and amplifies output, has direct current parameter output; And
One comparison module; This module connects described upper and lower limit threshold value output and described direct current parameter output, has the loss of signal alarm output simultaneously.
2. a kind of according to claim 1 signal supervisory instrument is characterized in that: described adjuster comprises that one is connected the resistor voltage divider network between power supply and the ground.
3. as a kind of signal supervisory instrument as described in the claim 2, it is characterized in that: the variable gain amplifier in the described gain module comprises the differential amplifier of a plurality of cascades, and this multistage differential amplifier is except that the last level, and all the other are at different levels all to have adjustable active load.
4. as a kind of signal supervisory instrument as described in the claim 3, it is characterized in that:
Described differential amplifier has identical structure, and this structure comprises: the drain electrode of MOS differential pair tube is connected to power end by a drain resistance separately; By a tail constant-current source ground connection, this tail constant-current source is the metal-oxide-semiconductor that is operated in the saturation region to the source electrode of described differential pair tube jointly;
Described active load is realized by the both-end output that its source drain of metal-oxide-semiconductor that is operated in the saturation region is connected across differential pair; The MOS differential pair tube grid of first order differential amplifier is as the differential signal input; The both-end output of end one-level differential amplifier is amplified output as differential mode;
The grid of all active loads links to each other, and connects the grid of following pipe again, and this follows continuous one first constant-current source that connects again of tube grid drain electrode to ground; Described source electrode of following pipe connects the described output node of described resistor voltage divider network;
Wherein, all described tail constant-current sources are identical with the first constant-current source way of realization, and its all grids link to each other and insert identical bias voltage, all source electrodes ground connection that links to each other.
5. as a kind of signal supervisory instrument as described in the claim 4, it is characterized in that: described common-mode voltage follower comprises a sample resistance and one second constant-current source, wherein the sample resistance termination power of series connection; The second constant-current source grid links to each other with source electrode with described tail constant-current source grid respectively with source electrode; The described sample resistance and the second constant-current source tie point are as the common-mode reference output.
6. as a kind of signal supervisory instrument as described in the claim 5, it is characterized in that: described threshold value maker comprises a pseudo-amplitude converter and an arithmetic unit; Described pseudo-amplitude converter connects described common-mode reference output, has a threshold reference end simultaneously and is connected with described arithmetic unit; Described arithmetic unit has described upper and lower limit threshold value output.
7. as a kind of signal supervisory instrument as described in the claim 6, it is characterized in that: described pseudo-amplitude converter all has the differential pair form of identical topological structure with described amplitude converter.
8. as a kind of signal supervisory instrument as described in the claim 7, it is characterized in that: described differential pair form comprises: be connected to the differential pair tube of drain resistance separately, this differential pair tube grid separately and drain electrode short circuit; The described drain resistance other end interconnects and is connected to power end by a top constant-current source; Described differential pair tube source electrode links to each other and is connected to ground by one source pole resistance parallel with one another and one source pole electric capacity again; Two grids of the differential pair tube of wherein said amplitude conversion circuit connect described differential mode respectively and amplify output, and two source electrodes transform output as amplitude; One of them grid of the differential pair tube of pseudo-amplitude conversion circuit connects described common-mode reference output; The source electrode of differential pair tube transforms output as pseudo-amplitude, and two differential pair tube drain electrodes link to each other.
9. as a kind of signal supervisory instrument as described in the claim 8, it is characterized in that: described arithmetic unit comprises a comparator, and one adjusts pipe and first, second and third divider resistance; The source drain of wherein said adjustment pipe and described first, second insert power supply and ground with the 3rd divider resistance back in sequential series, adjust pipe and are positioned at power end, the 3rd divider resistance end ground connection; The negative input end of described comparator connects described pseudo-amplitude and transforms output, and comparator output terminal connects described adjustment tube grid, the tie point of positive input termination described second and the 3rd divider resistance;
The first divider resistance hot end is as the upper limit threshold output, and cold end is as the lower threshold output.
10. as a kind of signal supervisory instrument as described in the claim 9, it is characterized in that: described hysteresis comparator comprises a comparator and a pair of totem structure metal-oxide-semiconductor, and its totem structure is that PMOS pipe and NMOS pipe drain and the grid realization that links to each other separately; The described amplitude of described comparator positive input termination transforms output, and negative input end connects the drain electrode of described totem structure metal-oxide-semiconductor, the grid of output termination metal-oxide-semiconductor; NMOS pipe source electrode connects described upper limit threshold output simultaneously; PMOS pipe source electrode connects described lower threshold output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206806339U CN201904788U (en) | 2010-12-24 | 2010-12-24 | Signal detection device |
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| CN2010206806339U CN201904788U (en) | 2010-12-24 | 2010-12-24 | Signal detection device |
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| CN201904788U true CN201904788U (en) | 2011-07-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110930914A (en) * | 2019-12-17 | 2020-03-27 | 京东方科技集团股份有限公司 | Signal detection circuit, signal detection method and display device |
| CN113791331A (en) * | 2021-09-10 | 2021-12-14 | 烽火通信科技股份有限公司 | Input signal amplitude detection circuit with adjustable output signal range and method thereof |
| CN114024562A (en) * | 2021-11-04 | 2022-02-08 | 上海川土微电子有限公司 | Low-voltage wide common-mode detection range receiver |
-
2010
- 2010-12-24 CN CN2010206806339U patent/CN201904788U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110930914A (en) * | 2019-12-17 | 2020-03-27 | 京东方科技集团股份有限公司 | Signal detection circuit, signal detection method and display device |
| CN113791331A (en) * | 2021-09-10 | 2021-12-14 | 烽火通信科技股份有限公司 | Input signal amplitude detection circuit with adjustable output signal range and method thereof |
| CN113791331B (en) * | 2021-09-10 | 2023-09-15 | 烽火通信科技股份有限公司 | Input signal amplitude detection circuit with adjustable output signal range and method thereof |
| CN114024562A (en) * | 2021-11-04 | 2022-02-08 | 上海川土微电子有限公司 | Low-voltage wide common-mode detection range receiver |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20141224 |
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| EXPY | Termination of patent right or utility model |