
	Where results make sense

Topic: Current source

Related Topics

Current mirror

Operational amplifier

Comparator

Schmitt trigger

Electronic amplifier

Virtual ground

	Direct current - Wikipedia, the free encyclopedia
		For example, the voltage across a DC voltage source is constant as is the current through a DC current source.
		It is usually important with a direct current appliance to not reverse polarity unless the device has a diode bridge to correct for this.
		High voltage direct current is used for long-distance point-to-point power transmission and for submarine cables, with voltages from a few kilovolts to approximately one megavolt.
	en.wikipedia.org /wiki/Direct_current (480 words)

	Current source - Wikipedia, the free encyclopedia
		A current source is the dual of a voltage source.
		An ideal current source is a conceptual source used in network theory and analysis that delivers or absorbs electrical energy such that the electrical current is independent of the voltage across its terminals.
		Current sources are often used in place of resistors in analog integrated circuits to generate a current without causing attenuation at a point in the signal path to which the current source is attached.
	en.wikipedia.org /wiki/Current_source (1241 words)

	Current source circuit - Patent 4251743
		A first current source produces a fixed reference current of a first value in accordance with the scale adjustment while a second current source produces a second current of which the value is controlled by the output of a differential amplifier coupled to the control input of the second current source.
		In current source, an unknown voltage Vxo is converted into the unknown current Ix and in current source 1 the reference voltage V.sub.ref is converted into the reference current I.sub.ref. In this type converter, the unknown current Ix is integrated by the integrator 10 from an initial value over a given period of time.
		As shown, the source of a p-channel FET Q.sub.20 is connected via a resistor R and a connection point 23e to a positive potential +Vc with the gate and the drain coupled together at the terminal 23a of the second current source 22'.
	www.freepatentsonline.com /4251743.html (4945 words)

	current source or current sink?
		Current Singking merely passes the current to the load or from the load (open collector circuitryies).
		It is due to the fact that sourcing current is from inside the chip itself or core itself.
		The current of the source in digital logic should be close to zero but for some reason it's a little higher.
	www.edaboard.com /ftopic92294.html (908 words)

	Reference current source circuit - Patent 4308496
		Thus, with use of a current mirror including PNP transistors, it is relatively difficult to allow two currents of the same magnitude dependent on the emitter area ratio between the first and second transistors and the emitter resistor to flow into the first current source.
		The outputs 13 and 14 of the constant current sources 11 and 12 are further connected with a current sink 16 composed of NPN transistors Q3 and Q4 and a resistor R1.
		The above-mentioned current source circuit of this invention uses the two current sources 11 and 12 and the current mirror 15 as a circuit to supply the current sink 16 with two currents of the same magnitude which is determined by the current sink 16.
	www.freepatentsonline.com /4308496.html (2148 words)

	ePanorama (Site not responding. Last check: 2007-10-20)
		An idea current source is a high output impedance device: it willsupply current, but does not show in other ways on the load circuit.When you need a low-current source, using a linear regulator isa typical approach.
		This is not completely ideal current source, butgood enough approximation for most applications, where the load resistance is much smaller than the current limiting resistor resistance.
		Digital current source is nonvolatile - Digitally programmable current sources that feature automatic trimming and retain the setting despite power-down cycles are useful in applications such as RF- and laser-communications drivers.
	www.epanorama.net /links/psu_current.html (657 words)

	SHORTED WIRES DRIVEN BY A CURRENT SOURCE
		We will now try a combination of a DC current source and a shorted line which was seen to produce resonant behaviour when we were studying the mathematical model of the transmission line.
		The current source imposed its characteristic flow in the wires and in the process forced the upper wire to become positive and the lower one negative.
		Because we have a current source this time, we note a flux offset in the vertical direction but otherwise the waveforms of the net charge and the flux are identical.
	colos1.fri.uni-lj.si /~colos/COLOS/TUTORIALS/JAVA/CONDUCTIVITY/Shorted.html (1244 words)

	Current Sources, Sinks and Mirrors in Audio
		For all examples, a transistor with a current gain of 100 is used and the bias current will be set at exactly 100th of the expected collector current (using a current source, naturally).
		The current source shown is workable, but is highly dependent upon the gain of the transistor, and the supply voltage.
		The basic current mirror is shown in Figure 10, and it can be seen that whatever current is injected into the left side is mirrored, and the right hand side is a constant current source (sink) reflecting the injected current.
	sound.westhost.com /ism.htm (4186 words)

	Discover Circuits - Current Source / Sink Circuits #-C
		Amplifier and current source emulate instrumentation Amplifier: 11/13/03 EDN Design Ideas / (added 12/04) The classic three- or two-op-amp instrumentation-amplifier circuits are standard ways to amplify a small-amplitude differential signal contaminated with high common-mode noise.
		The easiest way to turn a simple dc/dc converter into a constant-current source is to use a sense resistor to convert the output current to a voltage......
		Current source enables op amp's output to go to ground: 09/05/04 EDN Design Ideas / (added 1/05) The LM324 is a cost-effective choice for an op amp, especially when you need to apply ground-level inputs.
	www.discovercircuits.com /C/curr-source.htm (852 words)

	Ideal Electrical Sources - Voltage and Current
		An ideal voltage source is a voltage source that maintains the same voltage across the source's terminals no matter what current is drawn from the terminals of the source or what current flows into the terminals.
		Notice that an ideal current source is somewhat similar to an ideal voltage source.
		That source - the wall plug - is designed to be a good voltage source - to maintain the voltage without change - as current is drawn from the plug.
	www.facstaff.bucknell.edu /mastascu/eLessonsHTML/Source/Source1.html (1789 words)

	Current source incorporates measurement functions: News from Yokogawa Measurement Technologies
		The new GS610 DC source measure unit from Yokogawa is described as a high-accuracy, high-speed programmable voltage and current source that incorporates both generation and measurement functions as well as a USB interface and USB storage functions.
		The GS610 is made up of a constant current source, a constant voltage source, a voltmeter, and an ammeter, each of which can be combined in different operating modes.
		The GS610 will then sweep the voltage or current levels specified in the generation pattern, measure the load current or voltage at the appropriate points and store the results in the internal memory (Ram), which can be detected as a USB storage device by a PC.
	www.laboratorytalk.com /news/yok/yok140.html (929 words)

	Feedback Circuit Enhances Efficiency of Boost-Converter Current Source - Maxim/Dallas
		To implement a step-up converter with current output, the approach often taken is simply to connect the load in place of the top resistor in a resistive-divider feedback network.
		A low-cost feedback network (Q1, Q2, and associated resistors) improves the efficiency of this switchmode current source by a factor of six.
		In Figure 1, a switchmode DC-DC converter configured as a 20mA current source minimizes the efficiency loss by lowering the sense voltage to 200mV.
	www.maxim-ic.com /appnotes.cfm/appnote_number/940 (382 words)

	Circuit Analysis Techniques
		For circuits containing independent voltage sources, a supernode is generally used when two nodes of interest are separated by a voltage source instead of a resistor or current source.
		In any linear circuit containing multiple independent sources, the current or voltage at any point in the network may be calculated as the algebraic sum of the individual contributions of each source acting alone.
		Hence, the Norton equivalent circuit is a source transformation of the Thévenin equivalent circuit.
	www.eas.asu.edu /~holbert/ece201/recipes.html (731 words)

	LM234 - 3-Terminal Adjustable Current Source
		The LM134/LM234/LM334 are 3-terminal adjustable current sources featuring 10,000:1 range in operating current, excellent current regulation and a wide dynamic voltage range of 1V to 40V.
		Current is established with one external resistor and no other parts are required.
		The sense voltage used to establish operating current in the LM134 is 64mV at 25°C and is directly proportional to absolute temperature (°K).
	www.national.com /pf/LM/LM234.html (301 words)

	Current Source / Sink Circuits - Electronic Projects & Circuits
		Digital current source is nonvolatile: 02/07/2002 EDN - Design Ideas / Digitally programmable current sources that feature automatic trimming and retain the setting despite power-down cycles are useful in applications such as RF- and laser-communications drivers.
		PC Controlled Current Source Supplies 100V, 1A, 16Bit Pulses : 04/29/02 Electronic Design - Ideas for Design / The current source shown in the figure is designed to support toroidal-cavity nuclear-magnetic-resonance electrophoresis (TCNMRE) measurements of molecular electrical mobility in chemical samples.
		Reference stabilizes exponential current: 10/25/2001 EDN - Design Ideas / In an antilog converter, the difference between the base voltages of two transistors sets the ratio of their collector currents: The use of matched transistors balances the first-order temperature coefficient but leaves a temperature-dependent gain term, q/kT.
	www.hobbyprojects.com /C/Current_Source_Sink_Circuits.html (686 words)

	F: Current Controlled Current Source
		Current controlled current source, or current gain block.
		Current flow is from the positive node, through the source, to the negative node.
		The direction of positive controlling current is from the positive node, through the element, to the negative node of ce.
	www.gnu.org /software/gnucap/man/node65.html (88 words)

	Tracking NetBSD-current
		Distributing the current development sources allows a greater number of people to see where the system is going, and to become involved with new features as they are implemented.
		At this point, you are relatively current and ready to build your own current source.
		Sources can be supped from any NetBSD sup server and the output from the SUP should be stored in a file for later reference.
	www.netbsd.org /Documentation/current (3236 words)

	AC Current Source (SimPowerSystems)
		The AC Current Source block implements an ideal AC current source.
		The positive current direction is indicated by the arrow in the block icon.
		A 0 frequency specifies a DC current source.
	www.weizmann.ac.il /matlab/toolbox/powersys/accurrentsource.html (157 words)

	EDN Access-- 6.22.95 Programmable current source powers charger (Site not responding. Last check: 2007-10-20)
		The circuit in Fig 1 is a digitally programmable current source capable of sourcing currents as high as 2.55A.
		The fundamental building block for any smart charger is the current source used to charge the battery.
		In Fig 1, the LM2576 step-down (buck) dc-dc converter serves as a current source to provide battery-charging current.
	www.edn.com /archives/1995/062295/13di1.htm (833 words)

	Javalab Controlled current source (Site not responding. Last check: 2007-10-20)
		With the bridge being balanced, verify the load independency of the current through the load, as well as the virtual absence of influence of a possible common-mode input voltage (as long as it does not drive the the opamp into saturation).
		, are not by themselves ideal voltage sources (as presumed in the applet diagram) two additional opamps might be needed as buffer amplifiers (voltage followers).
		The entire and fully generalized controlled current source may stil be implemented with four opamps on a single chip and eight identical high precision resistors.
	server.oersted.dtu.dk /personal/ldn/javalab/Circuit14.html (326 words)

	5 - Building the System from Source (Site not responding. Last check: 2007-10-20)
		OpenBSD source is managed using the CVS version control system, and cvs(1) is used to pull a copy of the desired source to your local machine for compilation.
		The source files available for download from the FTP servers are separated into two files to minimize the download time for those wishing to work with only one part of the tree.
		As the source trees consist of large numbers of mostly small files, turning on soft updates for the partition the source tree is on will often give significantly better performance.
	www.openbsd.org /faq/faq5.html (7008 words)

	Opamp Current Source
		In this application, your challenge is to provide a constant current regardless of the voltage developed across the load.
		The circuit above maintains a current through a floating load RL (neither end is connected to ground.) The key to the circuit's operation is in placing a current sensing resistor RSENSE in the opamp feedback loop.
		You may have noticed that this circuit is a unidirectional current source - current flows in one direction only.
	www.ecircuitcenter.com /Circuits/curr_src1/curr_src1.htm (1073 words)

	<nettime> Six Limitations to the Current Open Source Development Methodo
		Six Limitations to the Current Open Source Development Methodology The "Open Source Approach" to develop informational goods has been spectacularly successful, particularly in the area for which it was developed, software.
		The other part is that the current development model is based on a number of specific, yet unacknowledged conditions that limit its applicability to more diverse contexts, say the music distribution or drug research.
		In this elaboration, I draw from examples of free and open source software, but it would be simple to illustrate these limitation based on open content projects.
	www.nettime.org /Lists-Archives/nettime-l-0308/msg00043.html (1383 words)

	Boost DC-DC Voltage Regulator Converts To Current Source for Battery Charging - Maxim/Dallas
		The connections shown convert this switch-mode voltage regulator to a general-purpose current source.
		This mode of operation allows an increasing ramp of current through Q1, causing the voltage at CS (pin 8) to increase until it reaches the internal comparator threshold (210mV).
		At higher voltages, delays cause the peak current to overshoot the current limit.
	www.maxim-ic.com /appnotes.cfm/appnote_number/113 (493 words)

	SQUID electronics & Current source
		The SEL-1 electronics is delivered with a simple DAC-output current source with a maximum current range of ±1.25 mA what makes it a practical tool for many applications.
		The first, an integrated ultra-low noise current source, can be used for field compensation with an external coil (dynamic field compensation or DFC).
		Due to the ultra low noise of the additional integrated current source (SEL-CS-1 version), this current source can be used in many other applications where low-noise currents are needed.
	www.magnicon.de /squidelectronics.html (585 words)

	The Linux Kernel Archives (Site not responding. Last check: 2007-10-20)
		We currently have mirrors of several distributions available at mirrors.kernel.org, as well as a small collection of special-purpose distributions at http://www.kernel.org/pub/dist/.
		Currently this is for reporting kernel version 2.6 bugs only.
		This site includes publicly available encryption source code which, together with object code resulting from the compiling of publicly available source code, may be exported from the United States under License Exception "TSU" pursuant to 15 C.F.R. Section 740.13(e).
	www.kernel.org /#whatislinux (1276 words)

Try your search on: Qwika (all wikis)