WO2011151103A1 - Schaltung zur taktung eines fpga - Google Patents
Schaltung zur taktung eines fpga Download PDFInfo
- Publication number
- WO2011151103A1 WO2011151103A1 PCT/EP2011/055947 EP2011055947W WO2011151103A1 WO 2011151103 A1 WO2011151103 A1 WO 2011151103A1 EP 2011055947 W EP2011055947 W EP 2011055947W WO 2011151103 A1 WO2011151103 A1 WO 2011151103A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frequency
- circuit
- circuit according
- reference clock
- clock
- Prior art date
Links
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
- H03K19/173—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using elementary logic circuits as components
- H03K19/177—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using elementary logic circuits as components arranged in matrix form
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
Definitions
- the present invention relates to a circuit for clocking an FPGA.
- Low power FPGAs are known. In measurement technology, for example, FPGA would be used, which have a power consumption of about 80 ⁇ .
- applications in metrology for example, require a precise clock, i. H. the deviations from the fundamental frequency should not exceed +/- 0.1% or +/- 0.2%.
- Such an accurate clock can not be provided by low power commercial oscillators. It would be possible to generate a very accurate clock signal through a PLL integrated circuit in the FPGA, which generates a faster clock based on an external reference clock.
- PLL circuits have the disadvantage that their power consumption is too large.
- the circuit according to the independent claim comprises an FPGA having an FLL circuit; a reference clock of a first frequency or a reference clock input for receiving a reference clock of the first frequency; a programmable oscillator that outputs a clock signal to the FPGA, the FLL circuit configured to detect a first number of clock signals of the programmable oscillator during a second number of periods of the reference clock, the first number is greater than the second number, and outputting a feedback signal to control the ratio between the first number and the second number by adjusting the feedback signal to the frequency of the second number
- programmable oscillator by the feedback signal by not more than 5%, in particular not more than 2% and preferably not more than 1% variable.
- the number of clock signals of the programmable oscillator during a period of the reference clock is detected.
- the second number is 1.
- the second number can also assume other values, for example 2, 3, 4 or 5.
- the ratio between the first number and the second number has, in particular, a predetermined or predefinable desired value which is greater than 10: 1, preferably greater than 100: 1 and particularly preferably not less than 500: 1.
- the frequency of the programmable oscillator is determined according to a
- the resistance value is adjustable via a series of individual resistors, which are used to reduce the
- Resistor are at least partially selectively bridged with respect to circuit ground.
- the series of selectively bridgeable resistors for example, contributes no more than 20%, in particular not more than 10% contributes to the total value of the resistor.
- the series of selectively bridgeable resistors for example, contributes no more than 20%, in particular not more than 10% contributes to the total value of the resistor.
- bridgeable individual resistors includes, for example, at least 5, in particular at least 10 and preferably at least 20
- variable resistance value can be varied in particular between a minimum value and a maximum value, wherein in particular for the case that the bridgeable
- Resistor elements all have the same resistance, the maximum value equal to the resistance of the bridgeable
- Resistive elements corresponds.
- the minimum value is as small as possible, in particular it is less than 5%, preferably less than 2% and particularly preferably less than 1% of the maximum value. In this way, the total value of the resistance, which the
- programmable oscillator controls, set by selectively bypassing the resistive elements and by adjusting the intermediate values by means of the variable resistive element almost continuously.
- N-1 is the number of bridgeable resistors
- the parameter i denotes the number of their
- N is the number of bridgeable resistors
- the resistance value can be set via a network of at least partially bridgeable individual resistors, the network comprising resistors connected in parallel and resistors connected in series.
- the first frequency of the reference clock is not less than 10 Hz, in particular not less than 50 Hz and particularly preferably not less than 100 Hz
- Frequency of the reference clock is according to this embodiment of the invention not more than 1 KHz, in particular not more than 500 Hz and more preferably not more than 250 Hz.
- Fig. 1 a schematic representation of the circuit according to the invention
- Fig. 2 is a block diagram for controlling a progrannnnierbaren
- the circuit 1 shown in Fig. 1 comprises an FPGA 2, a programmable oscillator 3, a reference clock 4 with a low clock rate and an FLL circuit 5 (according to the English Frequency Locked Loop), wherein the FLL circuit on the one hand, the slow clock of Reference clock 4 and the fast clock of the programmable oscillator 3 receives.
- the reference clock and the programmable oscillator are external components connected to the FPGA.
- the FLL circuit now regulates with a
- Counting method the faster clock of the programmable oscillator with respect to the slower clock signal of the reference clock.
- the clock edges of the faster clock are counted in a predetermined by the reference clock counting window and compared with a setpoint. Depending on the comparison result, the frequency of the programmable oscillator is increased or decreased.
- programmable oscillator in the presently preferred embodiment is a low power oscillator controlled via an external resistor, such as an LTC 6906.
- programmable oscillator can generate a clock between 10 kHz and 1 MHz, the current consumption at a supply voltage of about 3.15 V and a clock signal of about 300 kHz in the
- Programmable oscillator 3 is now explained in Fig. 2 in detail.
- the connections of the programmable oscillator 5 are occupied as follows:
- 5-1 Clock output with a frequency between 10 kHz and 1 MHz 5-2: Circuit ground, 5-3: divider
- 5-6 Supply voltage input.
- the divider input 5-3 is grounded, so that a signal with undivided clock frequency is output at the clock output 5-1.
- a series circuit of resistive elements is provided, which is selected so that a target value between about 300 kHz and about 330 kHz, in particular about 314 kHz is output as a clock signal.
- the chain of resistive elements has some resistive elements which are not bridgeable and which in total have a resistance of about 318 k ⁇ . This is followed by a chain of 22
- Resistance elements can be bridged by means of the FPGA 2, whereby by charging one of the control inputs Control 0 to Control 21 the
- Circuit ground is bridged.
- the target frequency is ideally reached at about 97.5% of the total, so for example at
- temperature-related deviations or deviations due to manufacturing tolerances of the resistance values or of the oscillator can be increased or decreased by switching to another bridging point. Whether the currently selected bypass point is too high or too low results from comparing the setpoint value of the counted clock signals of the programmable oscillator during a clock period of the reference clock.
- FIG. 3 shows an overall view, wherein for the sake of simplicity only 7 control points Control 1 through Control 7 are shown, which parts of the resistance chain can bridge.
- the resistance chain for example, initially be bridged from the control point Control 4, wherein depending on the deviation of the counted clocks of the programmable oscillator from the setpoint up or down another control point is activated to increase or decrease the clock frequency.
- the energy required to control the control points and the FLL circuit is about 10 ⁇ (with a supply voltage of 3.15 V), so that the total current consumption for generating a fast and sufficiently precise clock is about 30 ⁇ at the present
- Supply voltage is. This means a reduction in power consumption compared to the current PLL circuits, which have a power consumption of about 1 mA in the present
- Resistance results in that the frequency signal of the oscillator will have a certain jitter, if the frequency is not reached by chance exactly at a given resistance constellation. In the event that this jitter is undesirable, the resistor chain may still have a variable resistor whose value is continuously controlled.
- Resistor elements of the same value and a resistor network with parallel and serially connected resistive elements are used, with which also other step values as integer
Landscapes
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2798105A CA2798105C (en) | 2010-05-12 | 2011-04-14 | Circuit for the clocking of an fpga |
CN201180023616.5A CN102893527B (zh) | 2010-05-12 | 2011-04-14 | 用于fpga的时钟的电路 |
US13/696,945 US8797081B2 (en) | 2010-05-12 | 2011-04-14 | Circuit for the clocking of an FPGA |
MX2012013015A MX2012013015A (es) | 2010-05-12 | 2011-04-14 | Circuito para cronometraje de matriz de puertas programable por campo (fpga). |
EP11714767.8A EP2569864B1 (de) | 2010-05-12 | 2011-04-14 | Schaltung zur taktung eines fpga |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010028963.9 | 2010-05-12 | ||
DE102010028963A DE102010028963A1 (de) | 2010-05-12 | 2010-05-12 | Schaltung zur Taktung eines FPGA |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011151103A1 true WO2011151103A1 (de) | 2011-12-08 |
Family
ID=44260797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/055947 WO2011151103A1 (de) | 2010-05-12 | 2011-04-14 | Schaltung zur taktung eines fpga |
Country Status (7)
Country | Link |
---|---|
US (1) | US8797081B2 (de) |
EP (1) | EP2569864B1 (de) |
CN (1) | CN102893527B (de) |
CA (1) | CA2798105C (de) |
DE (1) | DE102010028963A1 (de) |
MX (1) | MX2012013015A (de) |
WO (1) | WO2011151103A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104980150A (zh) * | 2014-04-09 | 2015-10-14 | 许文 | 一种基于fpga的时钟频率调整锁相方法 |
CN104777378A (zh) * | 2015-03-09 | 2015-07-15 | 国核自仪系统工程有限公司 | Fpga时钟信号自我检测方法 |
US9503106B1 (en) * | 2015-12-11 | 2016-11-22 | Globalfoundries Inc. | Frequency-locked voltage regulated loop |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5459435A (en) * | 1993-09-20 | 1995-10-17 | Fujitsu Limited | Frequency synchronous circuit for obtaining original clock signal by removing noise components |
WO2008132583A1 (en) * | 2007-05-01 | 2008-11-06 | Dialogic Corporation | Filterless digital frequency locked loop |
WO2008144917A1 (en) * | 2007-06-01 | 2008-12-04 | Kleer Semiconductor Corporation | Frequency synchronization |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4937846A (en) * | 1988-08-01 | 1990-06-26 | Allied Signal Inc. | Frequency counter-locked-loop apparatus for controlling digitally programmable oscillators |
US6842082B2 (en) * | 2003-05-30 | 2005-01-11 | Agere Systems Inc. | Programmable voltage-controlled oscillator with self-calibration feature |
FR2860663B1 (fr) * | 2003-10-01 | 2006-09-01 | Arteris | Dispositif de retard numerique, oscillateur numerique generateur de signal d'horloge, et interface memoire |
US7504902B2 (en) * | 2006-03-31 | 2009-03-17 | Silicon Laboratories Inc. | Precision oscillator having linbus capabilities |
US7365609B2 (en) * | 2006-07-26 | 2008-04-29 | Texas Instruments Incorporated | Hybrid stochastic gradient based digitally controlled oscillator gain KDCO estimation |
US7417510B2 (en) * | 2006-09-28 | 2008-08-26 | Silicon Laboratories Inc. | Direct digital interpolative synthesis |
DE102008012285B3 (de) * | 2008-03-03 | 2009-07-23 | Texas Instruments Deutschland Gmbh | Rechnerkernsystem mit Selbstschutz |
US7750701B2 (en) * | 2008-07-15 | 2010-07-06 | International Business Machines Corporation | Phase-locked loop circuits and methods implementing multiplexer circuit for fine tuning control of digitally controlled oscillators |
US7839222B2 (en) * | 2008-07-22 | 2010-11-23 | Ciena Corporation | Systems and methods using programmable fixed frequency digitally controlled oscillators for multirate low jitter frequency synthesis |
US7764132B2 (en) * | 2008-07-30 | 2010-07-27 | International Business Machines Corporation | All digital frequency-locked loop circuit method for clock generation in multicore microprocessor systems |
KR101541733B1 (ko) * | 2008-10-09 | 2015-08-04 | 삼성전자주식회사 | 디지털 제어 발진기 |
-
2010
- 2010-05-12 DE DE102010028963A patent/DE102010028963A1/de not_active Withdrawn
-
2011
- 2011-04-14 WO PCT/EP2011/055947 patent/WO2011151103A1/de active Application Filing
- 2011-04-14 MX MX2012013015A patent/MX2012013015A/es active IP Right Grant
- 2011-04-14 US US13/696,945 patent/US8797081B2/en active Active
- 2011-04-14 EP EP11714767.8A patent/EP2569864B1/de active Active
- 2011-04-14 CA CA2798105A patent/CA2798105C/en active Active
- 2011-04-14 CN CN201180023616.5A patent/CN102893527B/zh not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5459435A (en) * | 1993-09-20 | 1995-10-17 | Fujitsu Limited | Frequency synchronous circuit for obtaining original clock signal by removing noise components |
WO2008132583A1 (en) * | 2007-05-01 | 2008-11-06 | Dialogic Corporation | Filterless digital frequency locked loop |
WO2008144917A1 (en) * | 2007-06-01 | 2008-12-04 | Kleer Semiconductor Corporation | Frequency synchronization |
Also Published As
Publication number | Publication date |
---|---|
CA2798105A1 (en) | 2011-12-08 |
CN102893527A (zh) | 2013-01-23 |
MX2012013015A (es) | 2013-03-18 |
DE102010028963A1 (de) | 2011-11-17 |
EP2569864A1 (de) | 2013-03-20 |
US20130063194A1 (en) | 2013-03-14 |
CN102893527B (zh) | 2015-11-25 |
US8797081B2 (en) | 2014-08-05 |
EP2569864B1 (de) | 2019-08-21 |
CA2798105C (en) | 2017-04-04 |
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