WO2001054275A1 - Anordnung und verfahren zum einstellen der flankenzeiten eines oder mehrerer treiber sowie treiberschaltung - Google Patents
Anordnung und verfahren zum einstellen der flankenzeiten eines oder mehrerer treiber sowie treiberschaltung Download PDFInfo
- Publication number
- WO2001054275A1 WO2001054275A1 PCT/DE2001/000019 DE0100019W WO0154275A1 WO 2001054275 A1 WO2001054275 A1 WO 2001054275A1 DE 0100019 W DE0100019 W DE 0100019W WO 0154275 A1 WO0154275 A1 WO 0154275A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- driver
- output voltage
- voltage value
- time
- drivers
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
- H03K19/00323—Delay compensation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
- H03K19/00369—Modifications for compensating variations of temperature, supply voltage or other physical parameters
- H03K19/00384—Modifications for compensating variations of temperature, supply voltage or other physical parameters in field effect transistor circuits
Definitions
- the present invention initially relates to an arrangement and a method for setting the side tents of one or more drivers essentially independently of external conditions.
- the invention further relates to a driver circuit and advantageous uses.
- Drivers and driver circuits are known, for example, as pad drivers of integrated circuits such as microcontrollers, microprocessors, ASICs, memory modules or the like and largely determine the electromagnetic
- EMC Behavior of digital assemblies, such as control devices in automotive or automation technology.
- worst-case conditions are, for example, high ambient temperatures, low operating voltages, inexpensive manufacturing parameters leading to "slow" switching times, a maximum load size or the like.
- worst-case conditions usually only occur rarely, the output edges of such conventional drivers are usually much steeper than required, which worsens the interference spectrum.
- the edge times - rise time / fall time - are also not constant due to possibly changing environmental conditions.
- a driver that is ideal with regard to the electromagnetic behavior has maximum permitted large edge times that are independent of external conditions, such as, for example, the ambient temperature, the operating voltage, the individual manufacturing parameters, the connected load size or the like. Furthermore, the maximum permitted edge times depend on the respective type of use of the drivers. For example, memory buses require a much shorter access time than, for example, input signals from an electrical switch (called a smart power switch).
- a digital driver circuit for an integrated circuit in which the driver circuit can be adapted by the operator to a specific application. Depending on the type of application, in this case depending on the load capacity of a component to be operated with the driver circuit, the latter must enter a corresponding measure into an input device.
- the dimension figure is a variable depending on the application.
- This circuit is structurally a controller.
- EP-A-0 436 316 AI furthermore specifies a circuit arrangement which adapts the impedance of a driver to a connected network.
- the circuit arrangement should be suitable for being able to adapt itself to a load with an initially unknown impedance.
- the circuit arrangement has a driver with a predetermined impedance.
- An element for selectively selecting an impedance is connected to the driver and, when actuated, causes changes in the predetermined impedance to a desired, different impedance of the connected load. Another element is using this element to select the
- This element measures the impedance difference between the output of the driver and a digital circuit connected to it. On the basis of the measured values, a suitable impedance is selected from the element for selecting the impedance and added to the predetermined, that is to say preset, impedance of the driver.
- the object of the present invention is to provide an improved arrangement or a method for setting the edge times of one or more drivers and an improved driver circuit with which, in particular, the edge times of one or more drivers are set in a simple manner and essentially independently of external conditions can.
- this object is achieved by an arrangement for setting the edge times of one or more drivers essentially independently of external conditions, with a device for detecting the time profile of an output voltage output by the driver (s) to a load , a device for converting the measured time profile of the output voltage an output voltage value, a device for generating a reference voltage value, a device for specifying a desired edge time for the driver (s), which is essentially independent of external conditions, which is connected to the device for generating a reference voltage value, and a device for comparing the output voltage value with the reference voltage value, the comparison device being connected or connectable to the driver (s).
- the arrangement according to the invention makes it possible to be able to set the edge times of drivers independently of external conditions.
- the list of these external conditions is purely exemplary, so that the edge times can also be set independently of other external conditions not explicitly mentioned in this list.
- the arrangement according to the invention ensures that one or more drivers are / are calibrated by means of a control cycle, which can preferably be repeated, in such a way that the user of such a driver sets and achieves desired edge times which can be selected within wide limits largely independently of the external conditions can be.
- the basic principle of the arrangement according to the invention is to generate a reference voltage value that corresponds to the desired edge time that can be programmed by the user.
- This reference voltage value is compared with an actually measured output voltage value.
- the or the drivers are adapted.
- an output voltage is output by the driver.
- This output voltage is passed on to a load. If the load connected to the driver (s) is a load capacity, this load capacity is charged to an operating voltage Vdd on the basis of the output voltage output by the driver (s).
- the driver (s) are activated, the output voltage at the driver output will increase until the operating voltage Vdd is reached. The same applies to the reverse case.
- This time course of the output voltage is recorded by the device for detecting the time course, which is specified in the further course of the description.
- the measured time values are converted into an output voltage value in the device for converting the measured time profile of the output voltage.
- This output voltage value can be buffered.
- a corresponding reference voltage value is generated in the device for generating a reference voltage value, which will be explained in the further course of the description.
- the reference voltage value is generated in such a way that a desired, freely selectable and essentially independent edge time for the driver (s) is specified by the user of the arrangement via a device for specifying an edge time. For the reasons described above, this time signal is again converted into a voltage value, the reference voltage value.
- the reference voltage value can in turn be buffered.
- the output voltage value and the reference voltage value are then compared with one another in the comparison device.
- This comparison device is likewise connected or connectable to the driver (s), so that the driver (s) or its driver strength can be adapted via the signals output by the comparison device.
- the device for detecting the time profile of the output voltage output by the driver (s) to a load can preferably be designed as a window comparator.
- This window comparator can advantageously have two voltage comparators (CP1, CP2) which are connected to an AND gate.
- the time course of the output voltage at the driver output up to the operating voltage Vdd can be monitored via such a window comparator.
- the output of the window comparator can be switched to "high", for example, during the rise time or the fall time of the voltage signal.
- the rise time or the fall time can be, for example, the period of time that a signal requires in order to reach from 10% to 90% of the final voltage.
- the two voltage comparators CP1, CP2 can be configured, for example.
- One of the voltage comparators can then, for example, be a corresponding one
- the other voltage comparator can, for example, output a "high” signal until the voltage signal has reached the 90% mark of the final voltage. Both signals of the respective voltage comparators are combined in the AND gate. If both voltage comparators deliver a "high” signal, the voltage signal output by the driver is located in its rise time or in its fall time.
- the output of the window comparator can therefore be "high” if:
- the device for converting the measured time profile of the output voltage may have an output voltage value, a current source, a switchgear and a capacitance, the switching Terelement via signals of the device for detecting the time course of the output voltage output by the driver (s) to a load is actuated or can be actuated.
- the measured time value is converted into a voltage value.
- the switch element can be closed, for example, during the "high" state of the device for detecting the time profile of the output voltage (advantageously the window comparator), as a result of which a previously discharged capacitance (for example a measuring capacitance Cmeas) is brought to an output voltage value (Vmeas.) By means of the current source ) is loaded.
- the device for generating a reference voltage value can advantageously have a current source, a switch element and a reference capacitance, the switch element being actuated or being actuatable via signals from the device for specifying a desired edge time for the driver (s).
- the reference capacitance (Cref) can be charged to a reference voltage value (Vref) in the manner described above.
- the duration during which the switch element is closed is specified by the user of the arrangement by using the device for specifying a desired edge time for the driver (s) which is essentially independent of external conditions and which will be explained in more detail in the further course of the description , operated.
- the time period during which the switch element is closed thus corresponds to the desired rise time or fall time.
- the device for comparing the output voltage value with the reference voltage value can be designed as a comparator.
- This voltage comparator (CP3) compares the output voltage value (Vmeas) with the reference voltage value (Vref). If Vmeas ⁇ Vref, then the capacity for the output voltage is charged shorter than the reference capacity. The actual rise or fall time was therefore shorter than the desired one.
- the voltage comparator (CP3) can indicate this, for example, by outputting a "high" level, which reduces the driver capability of a connected driver. The same applies to the case Vmeas> Vref.
- the control cycle starts again at the next rising or falling edge, so that the driver is successively adapted to the load and the desired edge time.
- a device for selecting the driver strength can preferably be provided, this device being connected to the device for comparing the output voltage value with the reference voltage value and the device for selecting the driver strength being furthermore connected or connectable to the driver (s).
- the device can have corresponding control lines, for example
- driver enable bus (DEB)
- DEB driver enable bus
- the device can preferably be designed to specify the desired edge time for the driver (s) to generate a rectangular pulse, the length of which corresponds to the desired edge time.
- the device is designed to specify the desired edge time for the driver (s) to process a system clock.
- a system clock is present, for example, in microcontrollers, microprocessors and most ASICs.
- the system clock is usually generated from an external quartz or oscillator and can be assumed to be constant with regard to the external conditions mentioned.
- the pulse length t l / (2 * fmc) can be tapped directly.
- phase-locked-loop circuits can be used. It is also possible to use a circuit which has the features described below.
- the device for specifying the desired edge time for the driver (s) can preferably have one or more delay elements. Each delay element delays the output of the rising edge of its input, depending on a control voltage (Vctrl).
- the input signal is, for example, a relatively low-frequency system clock which, when using several delay elements, runs through a chain of such delay elements.
- the device for specifying the desired edge time for the driver (s) can have at least one phase detector.
- a phase detector checks whether the falling edge of the input signal (master clock) occurs at the output of the delay chain at the same time as the rising edge which is output with a delay.
- control voltage is changed in this way. changes that in the next cycle the phase difference becomes smaller.
- a device for generating such a control voltage can be provided.
- the device for specifying the desired edge time for the driver (s) can advantageously have at least one switch element, in particular a multiplexer, for switching between different edge signals.
- the user can use this switch element to select a signal that he wishes, which then corresponds to the desired edge time.
- the switch element is preferably designed as a multiplexer.
- Such multiplexers are already known per se. They have a decoder that can select a desired one from n inputs, and then connects this to an output. In CMOS technology, multiplexers can be implemented with gates as well as with analog switches.
- Such a configuration of the device for specifying the desired edge time for the driver (s) can initially compensate for fluctuations in the external conditions in a simple yet very precise manner. Furthermore, such a device has the advantage that there is a fixed and unambiguous relationship between the selected output pulse duration (edge time) and the system clock frequency.
- a driver circuit for driving a load having one or more drivers connected to the load. According to the invention, this driver circuit is characterized in that the driver (s) is / are connected to an arrangement according to the invention as described above for setting the edge times.
- the driver circuit according to the invention enables the driver (s) to be calibrated / calibrated by an advantageously repeating control cycle in such a way that the edge times desired by the user and selectable within wide limits can be set or achieved largely independently of external conditions.
- the driver (s) can preferably be designed as a scalable driver.
- Each driver can advantageously consist of one or more sub-drivers.
- the use of several sub-drivers is known per se and is described, for example, in DE-195 45 904.0, also filed by the applicant, the disclosure content of which is included in the description of the present invention.
- a scalable driver consists of a certain number, preferably parallel, partial drivers, these can be individually enabled or blocked using control lines (driver-enable bus, DEB). If the driver changes gang-input its state, switch all released partial drivers accordingly and load or unload a connected load via the driver line output.
- DEB driver-enable bus
- the splitting of the driver into several sub-drivers has the further advantage that a large output resistance can be obtained with a low driver power, and that less interference can be coupled onto the supply lines. Furthermore, it makes sense to make the transistor widths of each driver stage twice as large as that of the next smaller stage. The selection of the driver stages can thus be carried out by a "driver strength strength selector" designed as a binary counter, whereby the resulting driver strength range is covered in equal stages.
- the increase or decrease in the driver power after a control cycle can correspond, for example, to the driver power of the smallest driver stage.
- One or more drivers can advantageously each be connected to an arrangement for setting the edge times.
- drivers are preferably used in the context of integrated circuits. Such circuits are integrated on a chip, for example, on which usually very little space is available. In order to save chip area, fewer arrangements are preferably provided for setting the edge times than drivers connected to them.
- the individual drivers can each be connected to an arrangement via suitable switch elements, for example a multiplexer as already described above.
- suitable switch elements for example a multiplexer as already described above.
- the strengths of several, advantageously scalable, output drivers can be adjusted in succession, the respective optimal driver strengths being able to be buffered.
- Such Circuit arrangement can be advantageously achieved that the control is carried out only in certain phases, such as the so-called set-up phases and then the driver strengths found are checked at suitably selected time intervals.
- the load connected to the driver (s) can advantageously be designed as a capacitive load. This is the most common design of such loads, particularly in the area of CMOS circuits. Nevertheless, the invention is not limited to capacitive loads, so that ohmic or inductive loads as well as any combination of the individual load types are also conceivable.
- a method for setting the edge times of one or more drivers is provided which is essentially independent of external conditions and which can be carried out in particular using an arrangement according to the invention as described above. This process is characterized by the following steps:
- the driver (s) can be calibrated in a simple manner in such a way that edge times desired by the user and selectable within wide limits are achieved largely independently of external conditions. can be set wisely.
- the basic principle of the method according to the invention is to generate a reference voltage value which corresponds to the programmable edge time desired by the user. This reference voltage value is compared with an actually measured output voltage value. The driver is adapted depending on this comparison result.
- the time profile of the output voltage can advantageously be measured by measuring its rise time and / or its fall time.
- the measured time profile of the output voltage can preferably be converted in a device for converting into an output voltage value. This is advantageous because voltage values can be compared much more easily and precisely than would be possible with time values.
- the device for converting the time profile of the output voltage can preferably have a current source, a switch element and a capacitance, the time profile of the output voltage m being converted into an output voltage value by the switch element being used for a predetermined period of time, in particular during the rise time (rise time ) and / or the fall time of the output voltage is closed, and that during this ) LJ l ⁇ 3 K.
- P ⁇ ⁇ PJ P P O rt cn ⁇ ⁇ Q cn o rt rt ⁇ ⁇ P:) ⁇ ⁇ s: P "rt tr tr P to 3 3 pj: -> rt ⁇ (0 ⁇ P 3 p , cn rt- w 3 3 C ⁇ 1 H ro ⁇ ⁇ ⁇ p.
- n- IQ C ⁇ ⁇ t >> ⁇ p. ⁇ ⁇ ⁇ P n o PJ Hi N rt ⁇ vQ ⁇ o ⁇ r + • P Cn N
- FIG. 1 shows a schematic circuit arrangement of a driver circuit according to the invention
- FIG. 2 shows a schematic circuit arrangement of a device for specifying the desired edge time for the driver (s) according to the present invention
- FIG. 3 shows a schematic circuit arrangement of a scalable driver consisting of several sub-drivers.
- FIG. 1 shows a driver circuit which is arranged, for example, as a driver circuit for pad drivers of integrated circuits on a chip 11.
- the driver circuit initially has an adjustable driver 90, which has a driver input input 92 and a driver output output 93.
- the driver 90 is connected to a load, in the present case a load capacitance 12, via the driver output 93.
- a load capacitance 12 for the sake of clarity, only a single driver 90 is shown in FIG. 1.
- the driver 90 is connected via a control line (driver enable bus, DEB) to a device 51 for selecting the driver strength, which is referred to as the "driver strength selector".
- DEB driver enable bus
- the adjustable driver 90 can consist of a number of sub-drivers 91. Each sub-driver 91 is connected to the "driver strength selector" 51 via a control line 52.
- the "driver strength selector" 51 is part of an arrangement 10 for setting the edge times of one or more drivers 90.
- the arrangement The voltage 10 initially has a device 20 for detecting the temporal change in an output voltage, which in the present exemplary embodiment is designed as a window comparator.
- the window comparator 20 is connected to the driver output 93.
- the window comparator 20 has two voltage comparators CP1 and CP2, which are designated by the reference numerals 21 and 22.
- the two voltage comparators 21, 22 are connected to one another via an AND gate 23.
- the arrangement 10 furthermore has a device 30 for generating an output voltage value.
- the device 30 has a current source 31, a switch element 32 and a capacitance Cmeas, which is designated by the reference numeral 33.
- the switch element 32 can be actuated via signals which are output by the window comparator 20.
- the arrangement 10 has a device 40 for generating a reference voltage value.
- This device 40 has a current source 41, a switch element 42 and a reference capacitance 43.
- the switch element 42 can be actuated via signals from a device 60 for specifying a desired edge time.
- the two devices 30, 40 for generating the output voltage value or the reference voltage value are connected to a voltage comparator CP3, which is designated by the reference number 50.
- the voltage comparator 50 is also connected to the "driver strength selector" 51.
- the device 60 shown in FIG. 1 for specifying a desired edge time is described in more detail in FIG. It has a number of delay elements 61 which convert an input signal, in the present case a system clock 63, m rectangular pulses 62 mt different pulse lengths. ) U_> MMP 1 P 1
- Switch elements for example multiplexers, can be connected to the arrangement 10 so that the drivers 90 can be adjusted one after the other.
- the respective, optimal driver strengths can be temporarily stored in a suitable storage device, not shown.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Logic Circuits (AREA)
- Electronic Switches (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/148,747 US6777974B2 (en) | 2000-01-20 | 2001-01-05 | Arrangement and method for adjustment of the slope times for one or more drivers and a driver circuit |
DE50100686T DE50100686D1 (de) | 2000-01-20 | 2001-01-05 | Anordnung und verfahren zum einstellen der flankenzeiten eines oder mehrerer treiber sowie treiberschaltung |
EP01909427A EP1264401B9 (de) | 2000-01-20 | 2001-01-05 | Anordnung und verfahren zum einstellen der flankenzeiten eines oder mehrerer treiber sowie treiberschaltung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10002376.2 | 2000-01-20 | ||
DE10002376 | 2000-01-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001054275A1 true WO2001054275A1 (de) | 2001-07-26 |
Family
ID=7628180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/000019 WO2001054275A1 (de) | 2000-01-20 | 2001-01-05 | Anordnung und verfahren zum einstellen der flankenzeiten eines oder mehrerer treiber sowie treiberschaltung |
Country Status (4)
Country | Link |
---|---|
US (1) | US6777974B2 (de) |
EP (1) | EP1264401B9 (de) |
DE (1) | DE50100686D1 (de) |
WO (1) | WO2001054275A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7129740B2 (en) * | 2003-11-28 | 2006-10-31 | Texas Instruments Incorporated | Low noise output buffer |
US7038513B2 (en) * | 2004-06-29 | 2006-05-02 | Intel Corporation | Closed-loop independent DLL-controlled rise/fall time control circuit |
US7038512B2 (en) * | 2004-06-29 | 2006-05-02 | Intel Corporation | Closed-loop independent DLL-controlled rise/fall time control circuit |
US7663418B2 (en) * | 2008-01-03 | 2010-02-16 | Nanya Technology Corp. | Driving circuit slew rate compensation method |
US8536913B2 (en) | 2012-01-20 | 2013-09-17 | Qualcomm Incorporated | Transition time lock loop with reference on request |
KR20140008073A (ko) * | 2012-07-10 | 2014-01-21 | 삼성전자주식회사 | 반도체 장치 및 이를 이용한 전력 관리 장치 |
US8638149B1 (en) * | 2012-08-06 | 2014-01-28 | International Business Machines Corporation | Equalized rise and fall slew rates for a buffer |
CN105553449B (zh) * | 2015-12-31 | 2018-09-07 | 苏州芯动科技有限公司 | 摆率自校准驱动电路、驱动器摆率校准电路及其校准方法 |
TWI656722B (zh) * | 2017-04-28 | 2019-04-11 | 偉詮電子股份有限公司 | 高壓充電控制方法、電源控制器、以及電源供應器 |
US11123077B2 (en) | 2018-09-25 | 2021-09-21 | DePuy Synthes Products, Inc. | Intrasaccular device positioning and deployment system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4567378A (en) * | 1984-06-13 | 1986-01-28 | International Business Machines Corporation | Driver circuit for controlling signal rise and fall in field effect transistor processors |
EP0264470A1 (de) * | 1986-10-21 | 1988-04-27 | International Business Machines Corporation | Verfahren zur digitalen Regelung der Flankensteilheit der Ausgangssignale von Leistungsverstärkern der für einen Computer bestimmten Halbleiterchips mit hochintegrierten Schaltungen |
US4945292A (en) * | 1988-08-08 | 1990-07-31 | Unisys Corp. | Dynamic vertical height control circuit |
DE4018754A1 (de) * | 1990-06-12 | 1991-12-19 | Bosch Gmbh Robert | Schaltung zur begrenzung der signalanstiegsgeschwindigkeit von ausgangssignalen integrierter schaltkreise |
GB2299720A (en) * | 1995-04-05 | 1996-10-09 | Hewlett Packard Co | CMOS output driver using reference slope signals |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4962344A (en) * | 1989-05-23 | 1990-10-09 | Advanced Micro Devices, Inc. | Segmented waveform generator |
EP0436316A1 (de) | 1989-12-08 | 1991-07-10 | Milos Sovak | Röntgenkontrastmittel für verlängerte Opacifikation |
US5742193A (en) * | 1996-10-24 | 1998-04-21 | Sgs-Thomson Microelectronics, Inc. | Driver circuit including preslewing circuit for improved slew rate control |
DE19900383A1 (de) | 1998-01-24 | 1999-07-29 | Continental Teves Ag & Co Ohg | Vorrichtung zum Einstellen einer Impulsflanke |
US5939909A (en) * | 1998-03-31 | 1999-08-17 | Stmicroelectronics, Inc. | Driver circuit having preslewing circuitry for improved slew rate control |
DE19825890A1 (de) | 1998-06-10 | 1999-12-16 | Mannesmann Vdo Ag | Verfahren zur Verbesserung des elektromagnetischen Verhaltens einer Schaltung |
DE19841719C2 (de) | 1998-09-11 | 2002-04-25 | St Microelectronics Gmbh | Schaltungsanordnung zur Flankensteilheitsformung |
-
2001
- 2001-01-05 US US10/148,747 patent/US6777974B2/en not_active Expired - Fee Related
- 2001-01-05 EP EP01909427A patent/EP1264401B9/de not_active Expired - Lifetime
- 2001-01-05 WO PCT/DE2001/000019 patent/WO2001054275A1/de active IP Right Grant
- 2001-01-05 DE DE50100686T patent/DE50100686D1/de not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4567378A (en) * | 1984-06-13 | 1986-01-28 | International Business Machines Corporation | Driver circuit for controlling signal rise and fall in field effect transistor processors |
EP0264470A1 (de) * | 1986-10-21 | 1988-04-27 | International Business Machines Corporation | Verfahren zur digitalen Regelung der Flankensteilheit der Ausgangssignale von Leistungsverstärkern der für einen Computer bestimmten Halbleiterchips mit hochintegrierten Schaltungen |
US4945292A (en) * | 1988-08-08 | 1990-07-31 | Unisys Corp. | Dynamic vertical height control circuit |
DE4018754A1 (de) * | 1990-06-12 | 1991-12-19 | Bosch Gmbh Robert | Schaltung zur begrenzung der signalanstiegsgeschwindigkeit von ausgangssignalen integrierter schaltkreise |
GB2299720A (en) * | 1995-04-05 | 1996-10-09 | Hewlett Packard Co | CMOS output driver using reference slope signals |
Also Published As
Publication number | Publication date |
---|---|
EP1264401A1 (de) | 2002-12-11 |
EP1264401B9 (de) | 2004-03-03 |
US6777974B2 (en) | 2004-08-17 |
EP1264401B1 (de) | 2003-09-24 |
US20030179029A1 (en) | 2003-09-25 |
DE50100686D1 (de) | 2003-10-30 |
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