1000 Threads found on edaboard.com: Voltage Controlled Pwm
Anyone who has experience with that how to get a pwm signal whose Puls should be controlled based one the I/P voltage ?5V Using simple OP-Amp ?
Thanks in advance
Electronic Elementary Questions :: 10-15-2012 11:25 :: halee awan :: Replies: 3 :: Views: 2042
I'd like to model a voltage controlled resistor in SPICE. How is this done using controlled/dependent sources? (I don't want to use a simple FET)
Professional Hardware and Electronics Design :: 02-21-2002 16:11 :: VSWR :: Replies: 2 :: Views: 3065
Designing A BJT voltage controlled Oscillator
? A simple voltage controlled oscillator is designed using the Clapp-Gouriet
? The oscillator is tuned by a varicap connected to a d.c. tuning voltage.
? This is a low power oscillator, operating at 400-450MHz at a supply (...)
RF, Microwave, Antennas and Optics :: 07-07-2004 01:07 :: myicejade :: Replies: 1 :: Views: 2048
VCO (voltage controlled Oscillator) is important for controlling frequency signal by another control signal. Thanks to VCO, you can maintain a stable frequency. Quality of VCO consist to avoid frequency shift when a constant input signal is applied.
Analog IC Design and Layout :: 07-26-2004 01:10 :: mazelk :: Replies: 6 :: Views: 1829
Does anyone know how to add a voltage-controlled cap in Cadence IC? I found a vccap model in analogLIb, but it can be only used in HspiceS. I want to use spectre simulator. Do I need to use Verilog-A or spectreHDL to model the device? Thank you.
Analog Circuit Design :: 08-06-2004 14:35 :: danda821 :: Replies: 10 :: Views: 4809
I have to design a *LOW POWER* voltage controlled amplifier. The first idea is to use a JFET in voltage controlled resistor and used it in an inverter Opamp.
I have found the LMC6041 Opamp from national.
The problem is that the JFET Vds=f(Id) characterisc isn't symetric.
By ex : for Vgs = -3v and Vds = (...)
Analog Circuit Design :: 08-17-2004 11:41 :: tibs :: Replies: 5 :: Views: 5065
Based on freq. range the Switch Capacitor is another way to have voltage controlled filters.
Analog Circuit Design :: 11-15-2004 11:04 :: Johnson :: Replies: 1 :: Views: 949
The output is a voltage. The input is a voltage. There are also courrent input controlled amplifiers called OTA.
Electronic Elementary Questions :: 06-17-2005 12:09 :: flatulent :: Replies: 4 :: Views: 4165
Hi. I'm looking for someone to build a relatively simple circuit for me.
I'm the owner of a 2004 Toyota Prius, and I'm trying to upgrade the audio system, replacing the amplifier and speakers. The problem is that the factory amplifier in my "JBL premium" sound system is what controls the volume and fader. If I just hook another aftermarket am
Analog Circuit Design :: 07-21-2005 20:13 :: sprexumn :: Replies: 0 :: Views: 772
To see the voltage at node 2 change, you can connect node 2 to a current source, or to a voltage source by a resistor. Don't leave it float, neither connect it to a voltage source directly.
Analog IC Design and Layout :: 07-31-2005 03:47 :: Hughes :: Replies: 5 :: Views: 3565
A differential-input amplifier + a voltage-to-current coverter can realize a vcvs. Both can be contructed with opamps.
Electronic Elementary Questions :: 01-21-2006 08:52 :: Hughes :: Replies: 2 :: Views: 1280
I need a paper (J. Craninckx and M. Steyaert, ?Low-noise voltage controlled oscillators using enhanced LC-tanks,? IEEE Trans. Circuits Syst.?II, vol. 42, pp.
794?904, Dec. 1995.).
But I cannot download it.Can you send it to me.Thank you very much.
My email is
Analog IC Design and Layout :: 04-03-2006 05:43 :: adwxl :: Replies: 0 :: Views: 815
I intend to design a ring VCO as shown in the figure. Could anyone suggest a voltage controlled current source that i could use to generate the control current (Ictrl)?
Analog Circuit Design :: 06-21-2006 06:05 :: nandu :: Replies: 2 :: Views: 1412
I need voltage controlled oscillator IC that operates on input from from -1v
to +1v giving max 40 Mhz square pulse oscillations at -1V or +1v
Electronic Elementary Questions :: 06-30-2006 11:00 :: fawad_hd97 :: Replies: 0 :: Views: 647
can current controlled pwm inverter be called as current source inverter?
i need formulas to calculate id , iq, theta in vector control of single phase asynchronous machine.
Other Design :: 10-03-2006 06:00 :: manjhula :: Replies: 0 :: Views: 768
In this case you can use LM317 voltage regulator and configure it as adjustable constant current source .. see picture below ..
More details you can find in the LM317's data sheet ..
This, of course will not be voltage-controlled-current-source, but it is a very simple alternative ..
If you need to control current by varying (...)
Analog Circuit Design :: 10-05-2006 22:32 :: IanP :: Replies: 9 :: Views: 2599
i need help in designing a cct that takes a dc input voltage and outputs a square/triangular wave. varrying the voltage should linearly change the frequency of the suare/triangular wave. the recomeded method is to use a non-linear cct such as an Integrator, together with an appropriate voltage-controlled interface.
Analog Circuit Design :: 10-06-2006 21:29 :: msalman :: Replies: 3 :: Views: 1171
in fet gate voltage conrols the drain current so it is voltage control
see the equation of relationship between Id and Vgs
and in bjt u see the equation Ic=(beta)*Ib so it is current controlled
Electronic Elementary Questions :: 01-02-2007 14:46 :: rabel126 :: Replies: 13 :: Views: 10319
The output voltage is a function of the input voltage. Specifically, the output equals the differential input voltage times the open loop voltage gain.
Electronic Elementary Questions :: 01-04-2007 11:47 :: Kral :: Replies: 8 :: Views: 1774
there are models which are just math equations that could be used. also in the ABM library.
i have found this handy for converting between units and then when you display the simulation result, typically in units of voltages, you can just convert one-to-one with the unit that you are measuring, like RPMs for motors or degrees rise for thermal
Analog Circuit Design :: 02-14-2007 20:03 :: Mr.Cool :: Replies: 2 :: Views: 3321
VCO(voltage controlled oscillator) is a voltage to frequency converter.
in PLL the output of phase detector i.e. the dc voltage proportional to the frequency difference is applied to VCO. VCO changes its own frequency to generate same frequency same as that of input slg. frequency. so that error voltage is zero.
Analog IC Design and Layout :: 11-20-2007 10:49 :: ameyakadam :: Replies: 7 :: Views: 737
Please, who can upload the following book:
Design of Higher-Performance CMOS voltage controlled
Thanks in advance.
Professional Hardware and Electronics Design :: 12-13-2007 09:54 :: master_picengineer :: Replies: 0 :: Views: 945
voltage controlled variable capacitor diodes (VVC)
What is it ?
plz help me.
RF, Microwave, Antennas and Optics :: 07-09-2008 09:20 :: elsalvador :: Replies: 2 :: Views: 1313
can any one help me to get the design of voltage controlled oscillator
i want to design the specified frequency bands with single vco....
i want to design it with the inversion mode varactor diode can u tell me the procedure...
Analog Circuit Design :: 03-03-2009 09:48 :: kbksharma :: Replies: 1 :: Views: 985
I have to drive leds of 24V and then 3v with the same 26V rail (from the same power supply).
So therefore, due to extremes of duty cycle, this is only practical in voltage mode.
-No off-the-shelf LED driver IC can manage this job.
But i cannot find a voltage mode pwm controller witha Duty Cycle extending to 0.95 or more. (...)
Power Electronics :: 03-01-2010 13:38 :: eem2am :: Replies: 2 :: Views: 961
Which frequency ( audio or RF ? ) it is very important to know
Output level ( 1 V; 0 dBm ? )
KV ( or Hz per volt of command )
Supply voltage and command voltage
Give us more info.
Hobby Circuits and Small Projects Problems :: 03-10-2010 07:47 :: FANT :: Replies: 2 :: Views: 1361
If you are after somthing simple, maybe you'll be interested in a voltage controlled dimmer based on an LED and an LDR .. see attached picture ..
Full desription is available at:
Analog Circuit Design :: 04-09-2010 22:01 :: IanP :: Replies: 2 :: Views: 4539
I wonder if one can define a voltage controlled voltage source in CST. Also, is it possible to define a time varying conductivity for a given material.
Electromagnetic Design and Simulation :: 05-07-2010 11:42 :: armanio :: Replies: 1 :: Views: 1736
I think, a current cannot "cause" a voltage.
I can't follow this consideration, in my view, there's a duality of current and voltage, each can "cause" the other in a specific situation. A current source isn't just an abstraction, it can exist as a standalone device without requiring a driving voltage. Consider e.g. a ribbon generato
Electronic Elementary Questions :: 08-25-2011 05:11 :: FvM :: Replies: 16 :: Views: 1436
I have some audio equipment that's uses a THAT2181 voltage controlled amplifier to do noise canceling.
Problem is I order from digikey and they do not carry this part. I need help finding an as close as can be replacement for this VCA but I
Analog Circuit Design :: 05-21-2011 00:02 :: iceblu3710 :: Replies: 1 :: Views: 437
Hello I want to convert this voltage controlled circuit in to potentiometer controlled circuit to obtain square waves, how can I do that?
Electronic Elementary Questions :: 08-15-2011 05:16 :: Mrkilic27 :: Replies: 5 :: Views: 1062
Using FET we able to design voltage controlled amplifier .simillarly is it posible design same circuit using BJT?if it so plz post circuit.
Analog Circuit Design :: 08-17-2011 05:04 :: harikrishnam :: Replies: 4 :: Views: 1316
maybe anyone can help me in finding the best circuit for voltage controlled oscillator....using ring oscillator...(dont have any resistor or capasitor in it)..that is easy to integrate....and easy to do their layout...i really dont have idea about this cicuit....plz....anyone....:???: i really need it asap.....
Analog IC Design and Layout :: 12-16-2011 06:58 :: Eilah :: Replies: 6 :: Views: 993
how can I make a voltage controlled resistance of range 0-15K ohms
I am thinking of using mosfets to do so
would that work ??
is there anyway else ???
Hobby Circuits and Small Projects Problems :: 05-03-2012 18:43 :: 3wais :: Replies: 2 :: Views: 1009
Hello, I'm looking for a voltage controlled phase shifter for operation at around 125MHz. RF bandwidth only needs to be a few MHz or so (more is fine), but I'd like to keep insertion loss consistent vs phase shift (maybe <3dB over its full range). Need a phase shift range of up to 90 degrees. Need something that can be board mounted (no cable mo
RF, Microwave, Antennas and Optics :: 08-01-2012 08:41 :: mtwieg :: Replies: 3 :: Views: 606
An ideal op-amp is voltage controlled voltage source or voltage controlled current source?
Thanks a lot.
Analog Circuit Design :: 09-29-2012 03:12 :: SherlockBenedict :: Replies: 1 :: Views: 1874
is the resistor element characteristic is same as the voltage controlled resistor model characteristic.yes or no how?how to implement voltage controlled resistance using VCVS.
Analog Circuit Design :: 10-08-2012 00:15 :: kavithanamakkal :: Replies: 1 :: Views: 274
BJT is said to be current controlled device. But we apply voltage divider as the base bias. Isn't it then voltage controlled? Can someone clarify? Thanks.
Analog Circuit Design :: 11-11-2012 11:47 :: mona123 :: Replies: 30 :: Views: 1182
I need to make a circuit working between 1 V and 2.4 V. I want to make a solar charger that charges a capacitor C2 until it reaches 2.4 V, once the voltage reach 2.4 V, the switch is closed and the led lits up. At the time, 1st capacitor is discharging, I want to charge another capacitor C3. When the 1st capacitor discharges to 1 V, then I want to
Analog Circuit Design :: 01-25-2013 00:02 :: Elex-factor :: Replies: 1 :: Views: 319
sir i m final year final sem m.tech student & in need of ur assistance
sir i designing 1.8-2.2 GHz LC CMOS voltage controlled oscillator
so sir can u please send me the AGILENT ADS schematics for design
& also the explanation for the circuits
plz send rep on
RF, Microwave, Antennas and Optics :: 02-03-2013 07:22 :: mike7486 :: Replies: 1 :: Views: 390
i am working on voltage controlled delay line (VCDL) for Delay locked loop(DLL).
i started VCDL design using Replica Bias which is given in razavi book(Fig attached).
as mentioned in book, For VDD= 3.3V , i kept VREF = 2.1V , so that to have swing of 1.2V.
And kept both M3 and M4 in linear region. The problem i am facing is :
1. The MOS op
Analog Circuit Design :: 02-19-2013 09:04 :: coolsaurabhsonu :: Replies: 0 :: Views: 516
I just want to know about symmetric load, how it works.
Why it is termed as a symmetric load , even it's not at all symmetric across its voltage swing.
and it's not even acting as a linear resistor.
but people are reporting this as a resistor which can acts as a variable resistor for voltage controlled delay line design in DLL. (...)
Analog IC Design and Layout :: 03-25-2013 06:10 :: coolsaurabhsonu :: Replies: 0 :: Views: 362
i am designing and simulate high performance voltage controlled oscillator but when i am writing the netlist have problem to get the Wmin and Lmin in 45nm technolohy in Hspice please tell me how can i select the minimum gate length and minimum gate width in 45nm technology in Hspice.
Analog Circuit Design :: 04-05-2013 08:30 :: vlsi_vishal :: Replies: 1 :: Views: 282
Hi, I am trying to include a voltage controlled resistor in NGSPICE net list.. I want to insert a resistor at the drain end of a MOSFET whose value depends on Gate voltage, such that as Gate voltage increases the resistance should decrease...
I am using NGSPICE-25
1) I searched on net and i found a spice net list for (...)
Software Links :: 05-05-2013 09:59 :: sandeeprad :: Replies: 1 :: Views: 23
I need an inexpensive voltage(or current) controlled gain stage. Basically, I need to control three op-amps with one pot, and a 3-gang pot is too expensive. I know I can use a JFET as a voltage-controlled resistor, but does anyone have any real-world experience with this approach? Since this will be going into a (...)
Analog Circuit Design :: 05-14-2013 11:31 :: barry :: Replies: 12 :: Views: 347
Hello from Greece !!!
This is a voltage-controlled oscillator (VCO). Αn oscillator that its frequency is controlled using a voltage signal. The VCO described here provide both triangular and square wave output. The control voltage can be varied between 5 mV to 5 V, to produce oscillation frequency (...)
Analog Circuit Design :: 06-14-2013 04:15 :: Achelius :: Replies: 2 :: Views: 292
Can someone explain how does a voltage controlled current source work using transistor and op amp? Does anyone have circuitry to construct this?Thank you.
Power Electronics :: 06-20-2013 04:22 :: kingearlkwan :: Replies: 4 :: Views: 544
I am trying to write a verilog A model for voltage controlled current source.
parameter real gain=1;
branch (p,n) iSrc;
I(iSrc) <+ gain*V(pc,nc);
It works fine when there is a load connected to the current sourc
Analog IC Design and Layout :: 07-10-2013 11:01 :: mvj :: Replies: 0 :: Views: 823
:!: I want to design a voltage controlled current source based on Look up table in ADS 2012. I searched and I could not find anything useful.
I used DC simulation on a diode to get I-V curve. Now I want to make a current source generator based on the simulated values.
:?: What should i do?
Analog Circuit Design :: 12-06-2013 06:29 :: MamadJun :: Replies: 0 :: Views: 153
I am simulating phase shifters in schemetic of 6 bits i.e. making of 5.625, 11.25, 22.5, 45, 90, 180 individually by the help of low pass and high pass filters, but now the problem which i am having is with the control bits which are basically voltage controlled. I am not knowing how to control them with pin diodes transistors. The one w
RF, Microwave, Antennas and Optics :: 03-29-2014 14:34 :: riz_raxi :: Replies: 2 :: Views: 386