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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> gm/Id Methodology https://designers-guide.org/forum/YaBB.pl?num=1318667571 Message started by vinaydreddys on Oct 15th, 2011, 1:32am |
Title: gm/Id Methodology Post by vinaydreddys on Oct 15th, 2011, 1:32am Hi All, I am a student of VLSI and new to Analog Design. I have recently come across a methodology called the gm/id methodology which is claimed to be used for short channels. I am interested to learn this methodology and is looking for guidance in this regard. Thanks a lot in advance... :) Vinay |
Title: Re: gm/Id Methodology Post by raja.cedt on Oct 15th, 2011, 2:31am hello, yes you are correct, gm/id methodology is one of the best method to design op amps with lesser iterations. Please have look at this pdf https://ccnet.stanford.edu/ee214b/ Thanks, raj. |
Title: Re: gm/Id Methodology Post by Larry_80 on Oct 15th, 2011, 10:48pm gm/id methodology is just a way of characterizing your device. So gm/Id is basically an Efficiency measurement for a certain device and can be used as a quick way to obtain various parameters that can be used in design of Op-Amps as mentioned by the poster above. gm/Id in a way can be used as a figure of merit for your device, though this will only take care of parameters like gain etc. Since in Analog design (and Digital), Gain trades with bandwidth, we need to be able to characterize the frequency at which our device will still work as an amplifier and not attenuator, so this requires another type of FOM (figure of Merit) that considers both gm/Id and frequency. Analog design is very interesting and if you really have a passion for it, the sky is the LIMIT. |
Title: Re: gm/Id Methodology Post by Larry_80 on Oct 15th, 2011, 10:59pm In addition, you can plot your gm/Id versus Vdsat for your device. You will observe it reaches an optimum values at some Vdsat* value after which the efficiency decreases i.e u are just burning extra current without amplifying any further. So basically, you would like to bias your device around the vdsat* region. In all honesty, you need to study this in detail to be able to appreciate it. |
Title: Re: gm/Id Methodology Post by AnalogDE on Oct 15th, 2011, 11:04pm Have any of you checked out the book on gm/id methodology by Paul Jespers? It's available on amazon.... I'm wondering if it's worth picking up. |
Title: Re: gm/Id Methodology Post by RobG on Oct 26th, 2011, 12:40pm raja.cedt wrote on Oct 15th, 2011, 2:31am:
Hi Raj I didn't see any pdf at the link you provided. |
Title: Re: gm/Id Methodology Post by Praveen K on Oct 26th, 2011, 10:21pm hi Rob, download the course reader, from the handout link on left, here is it, https://ccnet.stanford.edu/cgi-bin/course.cgi?cc=ee214b&action=handout_menu k.praveen |
Title: Re: gm/Id Methodology Post by carlgrace on Oct 29th, 2011, 5:10pm AnalogDE wrote on Oct 15th, 2011, 11:04pm:
I checked out the book from the library when it first came out. I wasn't super impressed. I think Murmann's notes are better. |
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