Bill: Thanks for your information! I agree that MOS gate cap is a good idea. But I may not be able to guarantee the working range of MOS cap in strong inversion mode because the gain of the op-amp will be very high. Meanwhile, there is no triple well process, so all nmos's well is connected to substrate, pmos to VCC. What should I do? Bill.Cohen@xxxxxxxxxxxxxxxx wrote: Han, It may not be a great idea but I compensate all my opamps with MOS gate capacitors. Just make sure the device is in saturation otherwise you will get too much series resistance to the thin oxide device. If it is a rail to rail opamp you may need to used Both NMOS and PMOS devices to keep at least one device active depending on the common mode. Also, you will only be able to use the device in the well if you need a compensating device with one end not tied to the power supply. Bill Cohen Toshiba America Bi Han com.cn> cc: Sent by: Subject: [SI-LIST] op-amp compensation capacitor in digital cmos si-list-bounce@fre process elists.org 07/15/2003 07:34 AM Please respond to mike_bihan hi, experts: I am on a project designing high speed limiter in digital cmos process. I need to design some op-amp as controlling circuits. So, I need capacitor to compensate them to stable. But, in my digital cmos process(1p6m), there will be no MIM/PIP capacitor, so I can not compensate the op-amp!! Any people have good idea? Thanks, Han --------------------------------- Do You Yahoo!? ¹úÄÚµçÓÊÓû§·´À¬»øµ÷²éÀ¿ªá¡Ä» ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu --------------------------------- Do You Yahoo!? ¹úÄÚµçÓÊÓû§·´À¬»øµ÷²éÀ¿ªá¡Ä» ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu