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52 Threads found on Back Bias
There could be some charge pumping / unanticipated rectification of the Miller current back into the gate at higher powers (meaning higher drain amplitude). Is the gate really DC driven? DMMs and power supply internal meters can be pretty bad at dealing with a lot of AC content too. A 'scope shot might give you more understanding, probe from suppl
back to basics: A BJT with no bias current should not conduct between collector and emitter pins so the LEDs should NOT light at all with no base current. The only current that might flow is through natural BJT leakage which will be no more than a microamp or so and insufficient to light the LEDs. The IRF840 is an enhancement mode MOSFET so it wi
Because for nmos in nwell natural body bias is VDD. So if You connect body (back gate in fact) to ground You decreasing threshold by positive VBS. If we consider the same technology, I think You should find every answer in process documentation.
The lower image looks like one way that common-mode feedback in a fully differential amplifier is done. The "forward" path is set to slightly-enough-less than balanced operating point, and the "back" path comes from a common mode sensing amplifier (with presumably enough filtering that it doesn't bug). "Adaptive, to achieve what?" is probably th
Dear, I have to design an inductively-loaded Miller divider, schematic is as below figure shown. The Vout is fed back to M3 and M4, Vin is 26GHz, Vout is 13GHz. Technology I used is tsmc 0.18um. Could anyone explain me how to start with? How to determine the size of MOS? What?s the optimum bias voltage of M1 and M2 generally? Thank you so much
back in the day....when all microwaves used WAVEGUIDES and diodes were in tall ceramic packages with pretty large package was hard to get those packaged diodes to reflect signals when they were forward biased. Then some bright guy thought "Hey, could I use a coaxial bias network to add an effective series capacitance, reactive ca
i am trying to simulate an OSC including Extended Gaussian Disorder Model (or equivalently pasveer mobility model) in silvaco, but the solution doesn't converge (it had this warnings and errors: "Error string found in output", "Newton algorithm did not converge in 5 iterations.","bias step cut back more than 4 times. Cannot trap."). i tried to sol
The capacitors with inductors form low-pass filters, to prevent RF and AC signals coupling back to DC power supplies. Using several capacitor values in parallel is recommended for blocking a wide frequency spectrum. High-capacitance capacitors (like 1...100 uF) have certain inductance, so using ceramic capacitors in parallel improves filtering for
diode must be connected across an inductor to avoid the damage since the back emf forward bias the diode when it's switched off.
Are you asking about maintaining a constant bias point (Ic) across temp, supply? Or are you asking about base current cancellation (compensation)? I think I've seen some reference to it in older analog design texts, back when bipolar devices were still dominant in analog design - Blue-cover Gray & Meyer, etc.) - but a lot of the art was hand-me-d
I can't understand why is this? - both source pins directly grounded through two holes to back side of PCB, so there are no any additional inductance - gate is biased -2.5v
Hi every one I want to know what the problem below means and how can I make it works correctly? Warning: Solution algorithm cannot reduce residual(s). Warning: bias step cut back more than 50 times. Cannot trap. Thanks in advance.
Hi every one I want to know what the problem below means an how I can make it works correctly? Warning: Solution algorithm cannot reduce residual(s). Warning: bias step cut back more than 50 times. Cannot trap.
Hi I want to run an structure that have 2 tunnel junctions, when I determine them as qtm. , I will get the error "Warning: bias step cut back more than 50 times. Cannot trap." but when I just include one of them, there is no error but the results are defiantly wrong!!! Can any body HELP ME PLS??? Thanks in advance.
I have been designing an oscillator. On feed back loop, I'm using ADL 5602 as an amplifier. For simulating DC bias effect and saturation, I need SPICE model or nonlinear model of ADL5602. How can I construt or find it?
i am trying to simulate thyristor and for back snaping i m using curvetrace statement but i m getting error after the mincur value and error is Warning: Solution algorithm cannot reduce residual(s). Warning: Convergence problem. Take smaller bias step. Error: Tracer unable to project past last solution. Error: Errors in projection during cur
I suppose I could use a schottky diode as it only has to withstand 36V in reverse bias, while the kick back voltage of several hundred V will forward bias a schottky diode. I suppose, the assumption is wrong. C2 will be charged up to the flyback voltage and the diode should be able to block it.
The cable to the head are for carrying the audio from the head when playing back and carrying the audio and bias to the head when recording. Bre careful if you disconnect the head and use the cables as an audio input for several reasons: 1. If you hit 'record' you could feed quite a high voltage at around 20KHz into the cable and cause damage, 2.
Your FDSOI MOSFET is really a dual gate device, with the handle wafer being the second gate and the BOX being its gate oxide. Generally a thick and inferior one with a poor surface quality (esp. SIMOX, icky poo). Your BOX thickness affects that back gate, back will modulate the evident front gate threshold. The handle bias and BOX charge (...)
First, if Ic=5mA, then the voltage across Rc is 100 volts. Second, if Ic is 5ma, then the voltage across Re is 15volts. back to the drawing board.