|
Fully Differential (from S.E.D) - FullyDifferential.pdf
1 Attachment(s)
In reply to....
From: "tiger66" Newsgroups: sci.electronics.design Subject: fully differential opamp implementation Date: 10 Mar 2007 07:59:40 -0800 Organization: http://groups.google.com Lines: 12 Message-ID: . com See attachment. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
Fully Differential (from S.E.D) - FullyDifferential.pdf
On Mon, 12 Mar 2007 14:39:06 -0700, Jim Thompson
wrote: In reply to.... From: "tiger66" Newsgroups: sci.electronics.design Subject: fully differential opamp implementation Date: 10 Mar 2007 07:59:40 -0800 Organization: http://groups.google.com Lines: 12 Message-ID: . com See attachment. ...Jim Thompson If the vcvs inputs were in antiparallel, and not grounded, it would have common-mode rejection. That's just two independent, grounded amplifiers. John |
Fully Differential (from S.E.D) - FullyDifferential.pdf
On Mon, 12 Mar 2007 18:09:24 -0700, John Larkin
wrote: On Mon, 12 Mar 2007 14:39:06 -0700, Jim Thompson wrote: In reply to.... From: "tiger66" Newsgroups: sci.electronics.design Subject: fully differential opamp implementation Date: 10 Mar 2007 07:59:40 -0800 Organization: http://groups.google.com Lines: 12 Message-ID: . com See attachment. ...Jim Thompson If the vcvs inputs were in antiparallel, and not grounded, it would have common-mode rejection. That's just two independent, grounded amplifiers. John Not the point. I was just jerry-rigging some Spice stuff to get it to work for the OP.... with his idealistic FLOATING source. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
Fully Differential (from S.E.D) - FullyDifferential.pdf
On Mon, 12 Mar 2007 18:24:06 -0700, Jim Thompson
wrote: On Mon, 12 Mar 2007 18:09:24 -0700, John Larkin wrote: On Mon, 12 Mar 2007 14:39:06 -0700, Jim Thompson wrote: In reply to.... From: "tiger66" Newsgroups: sci.electronics.design Subject: fully differential opamp implementation Date: 10 Mar 2007 07:59:40 -0800 Organization: http://groups.google.com Lines: 12 Message-ID: . com See attachment. ...Jim Thompson If the vcvs inputs were in antiparallel, and not grounded, it would have common-mode rejection. That's just two independent, grounded amplifiers. John Not the point. I was just jerry-rigging some Spice stuff to get it to work for the OP.... with his idealistic FLOATING source. ...Jim Thompson Will that even Spice with a floating source? With no DC path to ground? The real-life equivalent is not knowing what the hell the cm voltage is. John |
Fully Differential (from S.E.D) - FullyDifferential.pdf
On Mon, 12 Mar 2007 20:33:27 -0800, John Larkin
wrote: On Mon, 12 Mar 2007 18:24:06 -0700, Jim Thompson wrote: On Mon, 12 Mar 2007 18:09:24 -0700, John Larkin wrote: On Mon, 12 Mar 2007 14:39:06 -0700, Jim Thompson wrote: In reply to.... From: "tiger66" Newsgroups: sci.electronics.design Subject: fully differential opamp implementation Date: 10 Mar 2007 07:59:40 -0800 Organization: http://groups.google.com Lines: 12 Message-ID: . com See attachment. ...Jim Thompson If the vcvs inputs were in antiparallel, and not grounded, it would have common-mode rejection. That's just two independent, grounded amplifiers. John Not the point. I was just jerry-rigging some Spice stuff to get it to work for the OP.... with his idealistic FLOATING source. ...Jim Thompson Will that even Spice with a floating source? With no DC path to ground? The real-life equivalent is not knowing what the hell the cm voltage is. John In the direct E-mail notes to the OP I made a number of suggestions regarding using Rfudge ;-) to put in some DC paths to ground. Spending more time thinking about it, the VCVC inputs should simply be paralleled, and other circuit elements applied for DC paths. The output tap simply establishes output common-mode. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
Fully Differential (from S.E.D) - FullyDifferential.pdf
Jim Thompson a écrit :
On Mon, 12 Mar 2007 20:33:27 -0800, John Larkin wrote: On Mon, 12 Mar 2007 18:24:06 -0700, Jim Thompson wrote: On Mon, 12 Mar 2007 18:09:24 -0700, John Larkin wrote: On Mon, 12 Mar 2007 14:39:06 -0700, Jim Thompson wrote: In reply to.... From: "tiger66" Newsgroups: sci.electronics.design Subject: fully differential opamp implementation Date: 10 Mar 2007 07:59:40 -0800 Organization: http://groups.google.com Lines: 12 Message-ID: . com See attachment. ...Jim Thompson If the vcvs inputs were in antiparallel, and not grounded, it would have common-mode rejection. That's just two independent, grounded amplifiers. John Not the point. I was just jerry-rigging some Spice stuff to get it to work for the OP.... with his idealistic FLOATING source. ...Jim Thompson Will that even Spice with a floating source? With no DC path to ground? The real-life equivalent is not knowing what the hell the cm voltage is. John In the direct E-mail notes to the OP I made a number of suggestions regarding using Rfudge ;-) to put in some DC paths to ground. Spending more time thinking about it, the VCVC inputs should simply be paralleled, and other circuit elements applied for DC paths. The output tap simply establishes output common-mode. With an added VCVS to avoid reflecting the output current to the CM input :-) -- Thanks, Fred. |
| All times are GMT +1. The time now is 08:57 PM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 DIYbanter