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https://designers-guide.org/forum/YaBB.pl Design >> High-Power Design >> Design of HV DAC https://designers-guide.org/forum/YaBB.pl?num=1456999540 Message started by anakin on Mar 3rd, 2016, 2:05am |
Title: Design of HV DAC Post by anakin on Mar 3rd, 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. |
Title: Re: Design of HV DAC Post by loose-electron on 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. |
Title: Re: Design of HV DAC Post by anakin on 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 |
Title: Re: Design of HV DAC Post by ywguo on Mar 28th, 2016, 6:59am Hi Anakin, Any HV transistor available? Jerry's suggestion sounds good. Best Regards, Yawei |
Title: Re: Design of HV DAC Post by anakin on 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 |
Title: Re: Design of HV DAC Post by loose-electron on 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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