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Design of HV DAC (Read 3374 times)
anakin
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Design of HV DAC
Mar 03rd, 2016, 2:05am
 
Hello,
I am looking at possible options for design of 10 bit DAC in 180nm whose input is in 3-5V domain but needs to have an output in 40V domain.(Will be used in MEMs ASIC for Tuning and quadrature correction).
Requirement is to have a low area and low power ( high current drawn from LV supply is ok, but would like to have a low HV supply current draw) and monotonicity.
Most popular option seems to be a segmented resistor string DAC followed by HV Amplifier ( cascade of VtoI and ItoV converter).
Are there any other options which are preferable ( either from area or power point of view) ? Any interesting papers that I might look at?
Thank you.
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loose-electron
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Re: Design of HV DAC
Reply #1 - Mar 10th, 2016, 4:35pm
 
40V Output?

10 bits resolution?

What conversion rate?

It it is slow I would use a PWM method because then you have only one HV transistor and a LPF that has to be good to that voltage as well. Keep it simple.
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Jerry Twomey
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anakin
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Re: Design of HV DAC
Reply #2 - Mar 16th, 2016, 12:34pm
 
Hello,

Yes, I need a 40V output. Resolution needed is low ( say 6 bits).
Update rate is slow, say 500 Hz - 1KHz.
I am interested in looking at architectures with
a> low current draw from HV supply
b> low area
c> low noise
d> low HF ( ~60KHz) output impedance

Any leads would be appreciated !

Thanks
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ywguo
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Re: Design of HV DAC
Reply #3 - Mar 28th, 2016, 6:59am
 
Hi Anakin,

Any HV transistor available?  Jerry's suggestion sounds good.


Best Regards,
Yawei
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anakin
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Re: Design of HV DAC
Reply #4 - Mar 28th, 2016, 11:00am
 
Hello,
HV transistors are available ( both 5V and 40V ).
I am still working out the details of pwm based HV DAC , but meanwhile if you feel some other architectures might fit the bill, please share your thoughts ( with paper/tutorial links hopefully). Thanks !
Anindita
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loose-electron
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Re: Design of HV DAC
Reply #5 - Apr 22nd, 2016, 12:51pm
 
at the low bit resolution of 6 bits, and the low/audio type update rate, I see no need for anything more complex than PWM.
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Jerry Twomey
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Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical
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