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can anyone give suggestions regarding minimising settling time in a programmable current source/sink?
Hello! 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
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 (...)
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 (...)
schmit trigger in his post #4 explained the concept of power supply which can source current to the load or sink it from the load. Single transistor on output can only source current or sink it and not both.
Hi 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 its urgent please help me thanks ~niks~
Can i source 15mA current from &4HC126, with dc voltage max upto 3.3V I dint get this information in datasheet
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???
Use the PC port to pulse the led. Control the mark:space ratio to control the brightness OR Use the PC port with a D to A converter (but check that the converter can source/sink the required current first).
I think it is because there are two more current sources.
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 (...)
Have a look at these CMOS buffers: Also, to increase output source/sink current you can parallel CMOS buffers/gates .. Regards, IanP
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
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
yes, 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".
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. Srivatsan
hi cdc 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
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 ..
by source/sink current calibration or use current mirror to bias the output inverter stage
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
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.
Hi Hung, nice to meet you in the same physical/structural limitation corner of application circuits! What do you think is the right business model to work in this area. I am shure if I would post any circuit solution I will do it for compensation or do it opencircuit. These circuit problems I guess are hard and have found solution which are c
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
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
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.
Hi, 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
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
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.
To control your circuit you will need 9 relays .. If you select a microcontroller that can source/sink at least 20mA from it’s pin – and most of them can – you will be able to drive these miniature reed relays directly from the microcontroller pins .. but driving relays through transistors is a better idea .. see
it depends on what u are doing. if it is a current mirror/ current source/sink then u want better impedance so bigger length (i use 3-4 times the minimum), for input devices u want more gm without wasting too much area so use minimum length which also gives you more ft so more speed. and one more thing is the models are not very linear so goi
For 100mA you can parallel connect few ordinary operational amplifiers and use dual supply (amplifier outputs must have 10ohm series resistor) or one high current amplifier. Then you will have source/sink power supply for those -3÷+3V.
250v slewing in 1 usec with 2 mA max output source/sink. That is only an 8 pF load. Is that really what you want?
It depends of the ability of source/sink to put/get data from the FIFO fast enough. For exemple, let's say you have an UART feeding a FIFO on one side and, on the other side a driver which is wake up when FIFO is "almost full". If your "almost full" level is to high, may be your driver won't have time to handle the interrupt before the UART fi
Yes, 16 resistors will be the solution. Value? As smallest as possible, but it's limited by the AVR and the LS374 output current (source/sink) capacity. Assumed 20 mA there, 220 Ohm will be good (in series between the bus and the outputs of the two LS374 !!).
You need a current limiting resistor inline with the LED. Otherwise the you'll exceed the 25mA max source/sink per I/O pin current rating. What was damaged the LED or PIC?
The peizo works hooking it up straight to the 5v supply? Maybe you need a transistor in there to suplement some of the current if the micro can't source/sink it by itself?
Transistors P0,P1 form a simple 1:1 pmos current mirror.So,in this case you have the following ways to affect Vds os P1 : 1.)Varying the Ibias of the ideal current source,consequently you will manipulate Vgs as you said. 2.)Manipulating the W,L of the transistors that form the mirror. 3.)Changing the V1 DC potential. 4.)Changing the W,L of transis
We want to make a general tester using sub rack (U3) and different cards supposed to be inserted in miscellaneous sluts . The first idea for cards is Main Card : Communicating with PC via USB & Ethernet & Can and communicating with cards via CAN and equipped with different LCDs Relay Card : Composed of 40 relays source & Sin
Hi Rajeshree, setup up your testbench such that your OTA is in unity gain Feedback. Run a DC sweep and measure the output error current. you can connect your output to a current mirror source/sink (it depends on your transconductance design). Change in o/p current wrt change in i/p V is your Gm of the whole circuit..
Could any one give mathematical expression for the vector field in the presence of a source/sink such that when the divergence of that vector is calculated, the numerical value matches with the source/sink scalar value multiplied by the volume in which such a scalar quantity is enclosed. Any modifications in the question (...)
"hardware replication" technics is used by synthesis tools to get higher operating frequency, the tool replicates a piece of logic with high fan-out to reduce number of driven gates and to make source-sink connections shorter. If this is your case - you should switch off this option in your tool if your goal is gates count reduction; j.a
there wasn't any jumper between SC & SC terminal because there are 6 same brands & same model drives of different capacities are there . And none of them have any jumper between Sc & Sp . Then I wonder what you are asking for. It's clear from the posted schematics that the jumper must be connected to use the internal 24 V source.
Hi Shera, You can assign the two ends as source and sink.
In terms of what MOSFET drivers do.... they act as a buffer between the SMPS controller IC outputs (usually low current source/sink) and the MOSFET gate which is a dirty big capacitor! and if you need to switch it fast (like in a SMPS or motor controller) the current required to charge the gate cap to VgsON starts becoming significant... i.e. I =
Hi, all opamps are voltage follower. That means at the output is the same voltage as on the input. BUT on the output of the opamps you can source/sink some mA without changing the voltage. The voltages are stabilized. 1) Maybe it is needed by the sensor, (NTC, PTC, PT100, PT1000, diode, transistor...) or it is simply to
It should not be possible because it looks like an Push/Pull output driver which can source or sink 4mA. You would need an A/D converter input or an universal digital/analog I/O. Enjoy your design work!
how we change 4.2KΩ register in current mirror by using CMOS ? Current mirrors are used to generate current sources and current sinks of desired values. How can a resistor be a current source/sink ? It is a passive element. Please clarify your question ?
CAN transceivers are also generally designed to be quite robust - they have substantial amount of current source/sink capability, and output short circuit protection. They are capable of handling the dominant/recessive bit battles on long cable lengths without incurring damage. Some of them have significant ESD and overvoltage protection built
Hello all! I am getting into the solar hobby and have high hopes of building my own charge controller to handle up to 700W. I have been through this on another forum and most of the responses on there were to go buy a premade one or < 20A circuits, but I am a DIY'er and don't mind spending a little extra time learning as I go along. I just need
Hello! I have worked with microcontrollers for basic input/output and arithmetics. I just learnt that the entry level CPLDs cost about the same as a mid range microcontroller. I do not know much about CPLDs. But before beginning, it would be worth if I had a rough estimate of the capabilities of a CPLD. What to expect from a 32 macrocell CPLD?