407 Threads found on edaboard.com: Source Sink
can anyone give suggestions regarding minimising settling time in a programmable current source/sink?
Analog Circuit Design :: 09.07.2009 09:23 :: arup172 :: Replies: 1 :: Views: 657
i want to desing 20mA constat current source/sink circuit. My supply is varying from 2.2 - 3.4 Volts. Can anyone help me to design the same?
how can i maintain constant current throughout this supply range
please help me
Professional Hardware and Electronics Design :: 05.01.2004 10:05 :: niks :: Replies: 4 :: Views: 984
According to SGS Thomson Microelectronics:
IO DC Output source sink Current Per Output Pin ? 35 mA
Analog Circuit Design :: 29.12.2007 02:27 :: IanP :: Replies: 1 :: Views: 568
I'm not sure that I've chosen the proper forum section for this topic, sorry if I'm mistaken.
Please explain me what is the "source/sink output" current (how to measure it and how to simulate it using SPICE) of I/O cell? As far as I understand it is just a DC output current via resistor connecting the output with the ground. What I reall
Analog Circuit Design :: 24.09.2008 08:00 :: McSim :: Replies: 0 :: Views: 838
Hi everyone,I want to make a programmable current source (or current sink,depending on a digital signal) to provide me 0 to 10uA,10 bits resolution,but i am a beginner and i don't have a clue...Can anyone help???
Hobby Circuits and Small Projects Problems :: 22.09.2010 04:32 :: johnkaz77 :: Replies: 3 :: Views: 1530
CMOS inputs have high impedance and don't sink current. Cyclone II has absolute maximum ratings of 25 mA source and 40 mA sink per I/O pin. In addition there's a limition of 240 mA per power pair (8 respectively 12 pins). Drive strength is programmable, the highest refers to a 24 mA class (24 mA with respective min/max Voh/Vil). This also (...)
PLD, SPLD, GAL, CPLD, FPGA Design :: 13.10.2011 17:30 :: FvM :: Replies: 1 :: Views: 655
UPF 2.0 LRM where source and sink options being explored where user can write the power-intent
with the help of supply-sets.
It is seen that
for set_isolation (UPF command which is used to specify isolation strategy) and
set_retention (UPF command which is used to specify retention strategy) commands,
source and (...)
ASIC Design Methodologies and Tools (Digital) :: 18.02.2013 03:21 :: nitint08 :: Replies: 0 :: Views: 301
I need a design hint for a adjustable current sink or current source.
I want to control the current through a solenoid (hydraulic control). The current must be adjustable by a voltage (DAC). It should be a closed loop control. The current is in the range from 50mA to 1500mA. The supply voltage is 28V. It should be a switched mode Design.
Professional Hardware and Electronics Design :: 08.05.2002 05:44 :: HMaier :: Replies: 3 :: Views: 2093
I have to use a constant current,but I'm not sure current source or sink is suitable, what should I take care.
Or which one I can use, and why?
Thanks a lot
Electronic Elementary Questions :: 05.10.2004 05:34 :: chmr :: Replies: 11 :: Views: 8593
Use the PC port to pulse the led.
Control the mark:space ratio to control the brightness
Use the PC port with a D to A converter (but check that the converter can source/sink the required current first).
PC Programming and Interfacing :: 25.10.2004 03:32 :: dunn :: Replies: 7 :: Views: 1997
For Port 0 and 2 in Bus Mode when addressing external memory, you can count on 8mA source at a minimum of 2,4v output.
If you want to deliver outside more than 8 mA you can be sure that the output voltage will significant decrease.
Which is not your goal if you want to keep compatibility with a TTL input which needs minimum 2.0v in order to be re
Microcontrollers :: 05.02.2005 14:20 :: silvio :: Replies: 5 :: Views: 955
I think it is because there are two more current sources.
Analog Circuit Design :: 25.02.2005 02:52 :: whaler :: Replies: 5 :: Views: 1442
I think 3 bits are basically used for precision you have to source /sink the current based on this 3 bits used for correction in charge pump voltage .
Simple way is to based on the precision source/sink current needed you can mimic your charge pump circuitry carrying small precion current .you can have a resistor based 3 (...)
Analog IC Design and Layout :: 08.03.2005 23:51 :: mady79 :: Replies: 4 :: Views: 1287
I need to design accurate 1A current generator to drive 1 to 10 series connected high bright LED from 48V DC source. Any ideas?
Analog Circuit Design :: 07.03.2005 00:28 :: aslak :: Replies: 6 :: Views: 3793
At 8051 the ports don't have a "direction" register like other microcontrollers. If you write 1 at the port line it's the same as setting the port as output in high state or set as input (except port 0). The port have a weak pull up that will source current when it's pulled low by a external load like a resistor connected to ground or a transistor
Microcontrollers :: 16.05.2005 12:44 :: marie65 :: Replies: 1 :: Views: 1472
I am wondering if there is a chip to generate dc current sink in pcb. The nantional LM334 chip can only be used as a current source. Thanks.
Analog Circuit Design :: 18.07.2005 14:15 :: danda821 :: Replies: 1 :: Views: 698
I guess you're asking about the port on the back of a PC.
If your port is IEEE compliant, then the IEEE 1284-2000 standard says this about a Level 1 Device:
220.127.116.11 Driver requirements
a) Drivers shall operate at nominal 5 V TTL levels.
b) The open circuit high-level output voltage shall not exceed 5.5 V.
c) The open circuit low
Electronic Elementary Questions :: 07.11.2005 01:04 :: echo47 :: Replies: 3 :: Views: 9234
Have a look at these CMOS buffers:
Also, to increase output source/sink current you can parallel CMOS buffers/gates ..
Robotics and Automatics Forum :: 10.11.2005 22:52 :: IanP :: Replies: 3 :: Views: 1002
555 has source/sink current of up to 200mA so you should be able to drive your motor directly from its output (pin3) ..
Option1: you can use 555 in monostabile configuration (see picture below) and adjust time in such a way that the motor does only 1 turn .. Other option will require some sort of shaft encoder build around optocoupler or a switch
Electronic Elementary Questions :: 11.11.2005 22:14 :: IanP :: Replies: 2 :: Views: 791
Be very careful remembering which to use under which conditions, as reading the wrong register is the cause of more than a few beginner program problems. PortD is primarily for controlling the port when it's configured as an output (DDRB == 1) As setting portb will change it from sourcing to sinking curent. When DDRD == 0 (set to input) portD contr
Electronic Elementary Questions :: 08.12.2005 23:19 :: Sceadwian :: Replies: 1 :: Views: 576
Put one NMOS name M4 such this:
M4 source to M2 source
M4 gate to M2 gate and to M4 drain
and add one resistor or some network to prduce constant curent to M4 eg.
one resistor between VDD and Q4 drain
Analog Circuit Design :: 10.01.2006 04:11 :: Davood Amerion :: Replies: 4 :: Views: 1181
1. check deadzone.
2. check mismatch and leakage of source/sink.
3. are u sure it's locked? loop isn't unstable?
4. I think PLL need this small phase different keep it in "locking".
Analog Circuit Design :: 09.02.2006 21:49 :: hanjiemy :: Replies: 8 :: Views: 1055
You are right for sinking current you consider Iol and If of the led as for Io source you consider Ioh and also If of the led ( of course with a factor of safty ) but the output of the c mos series will not satisfy the required curent to light the led satisfactorily so use a buffer ( for example a high gain transistr with a resistance in base
Electronic Elementary Questions :: 08.04.2006 15:55 :: mohammad mokhtar :: Replies: 3 :: Views: 2174
I think the following book should help you in designing the W/L of an output stage. I used Class AB with floating current source.
Roubik Gregorian, Introduction to CMOS Op-Amps and Comparators, John Wiley & Sons, Inc., 1999.
I would also glance at Grey & Meyer.
Analog Circuit Design :: 23.04.2006 22:18 :: srivatsan :: Replies: 9 :: Views: 841
it could be a latchup, but it depends on what's connected to it. If it's I/O is connected to a couple of loads that source/sink a high current and the firmware froze with those I/O active, it could lead to an overheating.
However, you must make sure that the MCU can withstand the environmental conditions it will be in and that it will
Microcontrollers :: 30.04.2006 02:29 :: cyberblak :: Replies: 16 :: Views: 2014
and take a look at "Basic Properties of some TTL Families" ..
If, for example, "0 Level Input Current" for each TTL input is 1.6mA that means that the microcontroller pin can sink more than 4*1.6mA of current if it wants to generate an "L" on these inputs ..
Microcontrollers :: 07.07.2006 21:17 :: IanP :: Replies: 4 :: Views: 1917
From the description of your circuit, with a P-channel MOSFET connected to +supply and the 0.1Ω resistor connected to -supply (GND), it looks like you want to source current, not to sink it ..
Could you post the schematic diagram of your circuit?
Analog Circuit Design :: 06.08.2006 21:29 :: IanP :: Replies: 2 :: Views: 3164
Actually, it is easier to build a sinking current source ..
Here is one example based on the PICAXE-08 microcontroller and with slight modifications it can be converted to sink currents of several Amps ..
So, take a look at this example and if you have any comments please
Analog Circuit Design :: 05.10.2006 22:07 :: IanP :: Replies: 9 :: Views: 2488
In theory you are right: 47Ω, 147Ω .. bla .. bla .. bla ..
On the other hand, these values are unrealistically low, so, don't expect these circuits to work with them ..
To give you a hint, if β of contemporary BJT is easily >250 to source/sink its collector current of 1mA you need its base current to be somewhere in ?As region ..
Analog Circuit Design :: 06.10.2006 08:05 :: IanP :: Replies: 2 :: Views: 575
This is not current source. It has low output resistance.
Analog Circuit Design :: 14.01.2007 04:01 :: pixel :: Replies: 9 :: Views: 1089
by source/sink current calibration or use current mirror to bias the output inverter stage
Other Design :: 05.03.2007 12:15 :: email@example.com :: Replies: 6 :: Views: 6632
For designing general purpose IO, you need several steps
(1) be familiar with the application since the application determines the spec ALWAYS. If you are not familiar with application, then your IO is goind to be useless finally
(2) IO consists of input buffer and output buffer, separate two cases for design
(3) Input buffer should always have
Analog Circuit Design :: 23.02.2007 10:24 :: firstname.lastname@example.org :: Replies: 5 :: Views: 1370
Generally, it is necessary to use an AMP to drive speaker or headphone, actually there is a Power AMP intergrated into chips (after Audio DACs line out). however if driving headphone load only, the output power is much smaller, it is enough if there is 30~50mA source/sink capbility, exg, opamp.
Electronic Elementary Questions :: 18.02.2007 21:07 :: peterwangyu :: Replies: 4 :: Views: 1072
I have been doing analog for some years and have designed some fundamental stuffs. However, I still have faced many issues in those fundamental blocks that I would like to share with you and see if anyone have some new ideas
(1) ESD circuit structure with >8kV HBM
(2) Class D output stage with precise dead time control / EMI control
Analog Circuit Design :: 22.02.2007 20:56 :: email@example.com :: Replies: 10 :: Views: 1202
Some kind of integration will always be needed.
If you cannot use an RC integrator, use a DAC and a up/down counter.
As your input signal is high, count upwards high frequency pulses. When the input signal is low, count downwards. The output of the counter is supplied to a DAC. A low-pass filter smoothes the DAC output.
Another way could b
Analog IC Design and Layout :: 13.03.2007 08:24 :: Humungus :: Replies: 3 :: Views: 3122
I am designing one interblock data exchange block to transfer the data between two devices. can any body send some tips and matirials for designing a source and sink to data transfer. i am doing 8 bit serial trensfer. (cmd/bank,address,data1,data2..........cycle wise).only one input and one output.
Network :: 13.03.2007 04:28 :: vijaymails :: Replies: 1 :: Views: 699
A load of a TTL can be a resistor, a capacitor, or a current source. You will refer to a electrical characteristics part of a TTL Datasheet. They specify the test conditions and limits of a TTL.
Electronic Elementary Questions :: 14.04.2007 10:58 :: yjkwon57 :: Replies: 10 :: Views: 1460
AT89c51 is having very less source current. u cannot drive led, seven segment directly u have to use drivers. source and sink current vary for controller to controller. PIC microcontrollers will sink and source 20 mA. U can directly drive the leds, lcds with PIC microcontroller
Microcontrollers :: 05.05.2007 11:44 :: firstname.lastname@example.org :: Replies: 4 :: Views: 4009
Hello all, I am now designing a differential resistor ladder that has a top current source and a bottom current source. The current that flows through the resistor ladder is 15mA. I know that for the bottom current source, I can use NPN BJT to generate the current. I also know that I could have used PNP BJT to generate the current (...)
Analog IC Design and Layout :: 26.06.2007 18:55 :: chemaphy :: Replies: 3 :: Views: 1274
Curl as its name imply means the vector filed move in
a circular way. In other words the vector form a
circular closed form. The value of the rotor is the
magnitude of the rotation and the direction of the
vector curl-rotor is the axis of rotation.
But also means something else, a non zero curl vector
means the vector field will not have a
RF, Microwave, Antennas and Optics :: 12.09.2007 09:05 :: jallem :: Replies: 2 :: Views: 599
Sorry for bad english and stupid questions =)
1. Can i use for current sink and current source in simple LVDS driver one MOS transistor? Or i shall use more difficult current source?
2. Current sink/source shall operate in saturation or triode region?
Analog Circuit Design :: 21.03.2008 09:35 :: Warlike :: Replies: 2 :: Views: 922
Can i use Matlab (Simulink)as data source to FPGAVirtexII pro??
and if so , what can i do ,and what is needed? ,if any materials or any other help ,it will be appreciated
thanks in advance
Added after 11 minutes:
also i have an inquiry ,is it possible to use the Ethernet interface in spa
PLD, SPLD, GAL, CPLD, FPGA Design :: 23.06.2008 17:25 :: m_3aziz :: Replies: 5 :: Views: 1385
In the datasheet of MRF136Y, source is connected to the flange. I am so wondering how to connect the source to ground for this transistor.
I guess the source may be connected to the case-sink. this case-sink may be connected to the heat sink. Is that right idea?
I attach the MRF136Y (...)
PCB Routing Schematic Layout software and Simulation :: 24.07.2008 13:44 :: whitewiz :: Replies: 0 :: Views: 869
ok, you may need a buffer at the end of yur pipeline to balance the source/sink bandwidth. The depth of the buffer will depend on the source and sink's bankwidth characteristic.
ASIC Design Methodologies and Tools (Digital) :: 19.09.2008 00:42 :: yx.yang :: Replies: 2 :: Views: 741
I am looking for a bandgap current reference circuit (0.5u n-well process) to use it as a current source for biasing circuits. My understanding is that if a reference source is temperature independant it can also be considered process(corners) independent as many process parameters change with temperature?
I came across this circuit
Analog IC Design and Layout :: 18.01.2009 09:15 :: kishore2k4 :: Replies: 2 :: Views: 1019
I'm going to design a precision bidirectional current source that it's current should be variable by a control voltage (I use a 24bit digital to analogue converter to do load resistance is 10 Ohms and current source should be capable to sink and source a variable current between -300 to +300 mA through it.
I searched in (...)
Analog Circuit Design :: 01.06.2009 08:32 :: Mehdi1357 :: Replies: 8 :: Views: 9227
What kind of gate drive circuit do you use ? for PWM inverters you must use a dedicated IC like IR2110, 2113 which can charge/discharge MOS-FET gate very fast. if you used a simple circuit like in modified sine inverter, with just one transistor and resistor for chare/discharge, this is the result.
there are other options too, like fast optocoupl
Power Electronics :: 26.06.2009 02:41 :: cristivasilache :: Replies: 6 :: Views: 8031
I'm happy if anybody can help me.
I designde a circuit ,when i get the chip ,I find my bias have problem.
So I need a 10ua current source to setup the circut.
How can i get the cuurent,use res,cap........
Analog Circuit Design :: 01.12.2009 21:59 :: sxb416 :: Replies: 4 :: Views: 1610
The average forward drop of a Red/Gren LED is 1.2 Volts.
A Pic can source/sink ~20mA from an I/O pin.
So, if you plan to drive a standard led from a 3V supply at ~20mA, your series resistor would be:
(3 - 1.2) / 0.02 = 90.
So a 91R or 100R would be the value to use.
Microcontrollers :: 22.12.2009 20:11 :: btbass :: Replies: 5 :: Views: 1932
I found a voltage-controlled current sink as following:
For the sake of convenience, the circuit schematic in the article is copied and pasted here as Figure 1 below.
I'm not sure whether I could replace the "power supply under test" with the "armature winding circuit" as shown in the modified figu
Electronic Elementary Questions :: 03.01.2010 17:40 :: powersys :: Replies: 11 :: Views: 2734