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236 Threads found on Voltage Controlled Current
I have designed a ring vco with the input voltage ranging from 0.7 to 1.8V, but i need it to work below threshold voltage too. The increase in frequency with respect to the voltage has to be linear.135293 Regards, Vidj
Poorly controlled peak current? FB pin simply not designed to provide an exact current limiting. I have used a voltage clamp for FB in an application of a current mode controller with similar internal circuit and it did at least "work". Getting specifications for tolerances etc. of this unsupported function (...)
You need to be more specific about the application. What do you mean by impedance and impedance to what and what are the voltage and currents in question? Are you talking about a controllable termination in a high speed bus, variable resistance for voltage controlled gain, or a variable high power load? Any of those (...)
Even if both currents would be exactly equal, the circuit doesn't generate a "voltage window" rather than a voltage difference V1-V2 with unknown & floating absolute voltage somewhere between 0 and 5 V. I'm not aware of ready made controllable current source ICs in the ?A range. I designed similar (...)
Hi, all amplifiers I am aware of, "modulate" the power supply voltage/current at their output. The amount of "modulation" is controlled by the lower level signal at their input (base for a bjt, gate for a fet etc). In other words, the original signal waveform is not touched at all. It just drives the transistor, so that it can modulate the (...)
You could use "Step-Up voltage Regulator Module" like LM2577 with below circuit: 133170 For your application you need to change several thing: 1-Remove 7805, C11 and C12 . 2-Replace Zener diodes by 1N4746A (18V,1W); If circuit current consumption is higher than 100mA ,you should increase the maximum Power Dissipation of dio
Think of the BJT only as a Ibe current controlled Rce resistance much lower than the input bias R. Vce may start with a saturation voltage, Vs between 20 and 200mV depending design of transistor then Vce rises with pullup current Ic*Rce in a linear fashion. Rce is the differential collector emitter resistance that is (...)
Hi All I have a current controlled dc/dc full bridge converter with complementary output +85V and -85V that feeds audios amplifier. I'm trying to find the best way of measuring the full bridge output voltage (+85V/-85V) to provide the proper below 2.5V level signal for voltage loop of full bridge. The differential output (...)
You need to learn about the current-controlled transconductance amplifier to understand how the voltage-controlled lowpass filter works. Many years ago the CA3080 was the first current-controlled transconductance amplifier, then later came the LM13600, then the LM13700. Look them up in (...)
Hello, I need small help regarding the floating gate device. I am designing a non-volatile memory cell and foundry does not have model for floating gate . So I used the voltage controlled current source to mimic floating gate. For output characteristics, I already had the measurement of previous fabricated custom made floating gate and I (...)
current scaling is only a matter of FET and shunt selection. FETs with large Cgs and Cds might require some compensation and load capacitance isolation with fast OPs, but should work in any case. For higher supply voltage, I would use two OPs with individual supply voltages, the I/V level shifter can bridge even higher supply levels like (...)
Thanks Brad For example I need 40 dB gain for my amplifier design means Is there any relation to the current vs gain. Because if it has any relation then I choose the current from that relation to achieve my gain spec. The transistor is a voltage controlled device and the gain depends on the transconductan
I was reading a paper "A Novel Simple current-mode Multiplier/Divider Employing Only Single Multiple-Output current controlled CTTA" regarding analog multipliers. And in the introduction part they have mentioned abt BJT. "Unfortunately, they are suitable for working only in voltage-mode. They cannot be applied to employ (...)
I have a function generator (Escort EFG 2210) as a source to a UV-LED (LED255J ). The FG delivers about 7.5 Vrms and 30 mA pulse signal. The LED requires closer to 100 mA for optimal emission. The voltage is good enough. I have tried various amplifier circuits, but end up with less current than before. Any ideas?
Hi All, I have a current source (in 65nm CMOS technology) which pulls down the output from a logic tree and is controlled by a voltage (EN). I want to change it so that I now have this control using current instead of voltage. So essentially, I want it to be current (...)
I have just come across the condition for MOS voltage controlled current source below and I am a bit confused. Could you explain why not Vds > Vgs -
i think its because A FET is voltage controlled device because its output characteristics are determined by the Field which depends on voltage applied. - - - Updated - - - FET is voltage controlled current source
Tl431 Pin 3 is connected to Shunt resistor RS via R17. Can i expect voltage greater than 2.5 across shunt resistor?
Hi, I have a question about the voltage amplification stage of an (audio) amplifier. I just took this attached schematic as an example. The VAS transistor Q4 is driven by the output current from the input pair. It is said the VAS (voltage Amplification Stage) is a transimpedance stage, converting a current input into a (...)
If you have a transformerless inverter with PWM control, then the current must be controlled to match the (filtered ) voltage with no phase error, such that the net power dissipation in your inverter is never exceeded. Do you have this control? Do you have ; Suitable margins for component specs. with a design spec? thermal sensi