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hi, all, anyone can help to advice on the function of this kickstart circuit on I thought it was a current source. but after some simulation, it is getting more confusing. thanks in advance.
hFE is used with a linear transistor that is not saturated, the datasheet shows a Vce of a few volts to 10V. The datasheet for most transistors shows the saturation voltage drop when the base current is 1/10th the collector current disregarding the hFE.
Obviously the circuit can't work without a diode bias current. Due to non-linear diode and transistor characteristic and temperature dependency, it's effectively useless as current sense. It could possibly work as overcurrent detector. Dedicated high side current sense amplifiers are relative cheap and have hard-to-beat performance. If you a
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
A bipolar transistor is in the linear mode when it is biased so that its output can swing equally up and down like an amplifier. It is in the saturated mode when it ios turned on hard like a switch. A Mosfet is the opposite. It is in the linear mode when it is turned on hard like a switch with a low value resistance. It is saturated when it (...)
The free program LTspice from linear Technology can simulate those devices. The mic simulation generally involves just using a voltage source to simulate its output voltage.
How does source degeneration help improve linearity in a common source amplifier?
The distortion is directly related to the gm of the tail pair. If it's non-linear, mixer output will be non-linear. It should be biased with a large Vgs-Vt to lower the distortion.
These differences pertain to mode of operation mostly. "On" resistance is resistance, desired to be low, from drain to source in the hard-gate-driven linear region. Of course a weakly driven FET has an on resistance too. Just lousy. "Output" resistance -is- "on" resistance, when the FET is "on". But it's more of interest (i.e. different interest)
133280 1)#1, which is an alway turned on transistor and that acts as a resistor? it's Not degeneration resistor. what is that for. If it's acting like a resistor then it much operating at linear region. 2)#2 why there's a cross coupled nand gates? 3)#3 Is that a cross coupled element used for as latch, for stoarge?
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 current controlled by Ib, wh
Won't talk about transistor being "on" or "off", the circuit should work in linear range normally. It's simply a negative feedback path with low pass characteristic.
I think, when |VBE|<0.7 V is the transistor off, but when it exceeds 0.7 V, the transistor switches on. . The transistor is more than a simple switch. Don`t forget - it can be used as a quasi-linear amplifier. Hence, it is not "off" for |VBE|<0.7. When the C-B junction is reversed biased there is an exponential
I'm now make a board to produce a sub-nanosecond pulse using avalanche transistor. And I made it successfully. I'm quite sure that the waveform doesn't show avalanche breakdown. just linear amplifier operation.
You you want some sensible power output, you should use a mosfet. They are not really expensive any more and they are well suited for switching applications. You can use a BJT if you wish a linear regulation (e.g., a series pass regulation). There are plenty of introductory books on this topic and most are excellent for the beginners.
Did you measure the saturation voltage loss for your transistor to see if it is "typical" or better? A graph was posted but it is only for a "typical" transistor. Yours might be less or more. The graph shows the transistor being linear but not saturated since it has plenty of collector to emitter voltage. You want the (...)
Hi, Adjustable LDOs have, for example, a 1.2V reference fed to one of the error amplifiers inputs, and the feedback resistors are scaled to create 1.2V at the other input to the error amplifier. As AMSO12 said, it always seems to be a bandgap reference. I don't know how fixed regulators do this as I was researching adjustable, I think it will be
Hi can anyone kindly explain me the difference between small and large signal analysis. I found the definition "The small signal model accounts for the behavior which is linear around an operating point. When the signal is large in amplitude (say more than 1/5 of VCC, a rule of thumb) the behavior becomes non linear and we have to use the model whi
Hi i know translinear principle is nothing but the relation of transconductance and the collector current and also MOSFET in the sub threshold region have a linear behaviour. So my doubt i am not able to find if a topology of transistors build is in the translinear closed loop. Will transistor only in closed (...)
So it is operated in either saturation or cut off region but in between these two there is linear region (the intermediate region between the LOW and HIGH states of the transistor) and the transistor will obviously pass through that going from cut off to saturation and vice versa.How does that work? 120503