Kick Pulse Generator

[KingDarius6288]

Hi,

I'm looking for a MOS transistor circuit that generates a kick signal at power on (when the power supply is applied to the circuit). Could you please point me to a reference/document that describes the behavior of such a circuit?

 

[danadakk]

Some specifics :

1) Pulse width needed
2) Pulse load description, power of current or V needed.
3) Pulse width accuracy ?
4) Pulse V when high ?
5) Power supply available to power circuit ?
6) Origin or source of pulse enable input ? Is it noisy, ? Its risetime ?
7) Any special environmentals ?
8) Pulse sequencing, do you need to sequence load startups ?
9) Why MOS transistor, is this an IC design problem ?

Regards, Dana.

 

[D.A.(Tony)Stewart]

Given how vague your question was , I make 200 V kick from 5V with 388 mA pk using LC product optimized for the pulse duration.

http://tinyurl.com/ymacyt43

Now do you have a better question?

 

[KingDarius6288]

Some specifics :

1) Pulse width needed
2) Pulse load description, power of current or V needed.
3) Pulse width accuracy ?
4) Pulse V when high ?
5) Power supply available to power circuit ?
6) Origin or source of pulse enable input ? Is it noisy, ? Its risetime ?
7) Any special environmentals ?
8) Pulse sequencing, do you need to sequence load startups ?
9) Why MOS transistor, is this an IC design problem ?

Regards, Dana.

Hey Dana,

1- pulse width =2u
2- The output kick signal ( VL=0, VH=0.8) is applied to the gate of a MOS ( CL=10fF)
3- The pulse width accuracy is not that critical ( 2u +/- 20%).
4- Power supply to the circuit is 0.8. Its can be increased t0 1.8 if necessary
6- There is no enable signal, the circuit needs to generate the kick signal upon power up.
8- No pulse sequencing
9- Yes, its on chip.

Thanks

 

[D.A.(Tony)Stewart]

Ic= CdV/dt = 1e-16 * 0.8V / 2e-6 = 40 pA in 2us or 400 pA in 10% of 2us.
Thus Rs max = 0.8V / 400 pA = 2to 20 Gigs pullup (??) assuming RC = 64% that is not much of a kick.

Is your question how to make a unipolar one-shot , show the device characteristics in detail and PSU rise time.

--- Updated Dec 28, 2023 ---

Although your question is poorly defined, this may be what you are looking for.

 

[dick_freebird]

Search for "POR" and "power-on reset" for common
approaches. You should consider what the supply
turnon event looks like as various "trigger" schemes
may have dependencies that defeat it in application.
Such as a dV/dt trigger needing a minimum supply
slew rate, or a POR which doesn't get back to the
"reset" state leading to a failure to reset if the supply
hasn't been "dark" for long enough. Build yourself the
"challenge cases" to demonstrate robustness or reveal
its lack, according to what the application has to say.

 

[D.A.(Tony)Stewart]

What is the purpose of this?

The output kick signal ( VL=0, VH=0.8) is applied to the gate of a MOS ( CL=10fF)

10 fF means nothing without Ciss, Coss, Vt, RdsOn

 

[KingDarius6288]

Search for "POR" and "power-on reset" for common
approaches. You should consider what the supply
turnon event looks like as various "trigger" schemes
may have dependencies that defeat it in application.
Such as a dV/dt trigger needing a minimum supply
slew rate, or a POR which doesn't get back to the
"reset" state leading to a failure to reset if the supply
hasn't been "dark" for long enough. Build yourself the
"challenge cases" to demonstrate robustness or reveal
its lack, according to what the application has to say.

Thanks

--- Updated Dec 29, 2023 ---

Ic= CdV/dt = 1e-16 * 0.8V / 2e-6 = 40 pA in 2us or 400 pA in 10% of 2us.
Thus Rs max = 0.8V / 400 pA = 2to 20 Gigs pullup (??) assuming RC = 64% that is not much of a kick.

Is your question how to make a unipolar one-shot , show the device characteristics in detail and PSU rise time.

--- Updated Dec 28, 2023 ---

Although your question is poorly defined, this may be what you are looking for.

View attachment 187370

Thanks.