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From: Jim Thompson on 28 Mar 2006 18:08 In some prior posts there have been inquiries regarding low distortion oscillators. Out of curiosity I simulated a 200Hz oscillator made simply from an A1A-style gyrator BP filter, then wrapped a positive feedback loop around it, with back-to-back diodes used to limit the drive to the input to the BP filter. Result: 3rd harmonic was at -58dB ...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.
From: John Fields on 28 Mar 2006 20:01 On Tue, 28 Mar 2006 16:08:01 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >In some prior posts there have been inquiries regarding low distortion >oscillators. > >Out of curiosity I simulated a 200Hz oscillator made simply from an >A1A-style gyrator BP filter, then wrapped a positive feedback loop >around it, with back-to-back diodes used to limit the drive to the >input to the BP filter. > >Result: 3rd harmonic was at -58dB --- And the circuit file is where??? -- John Fields Professional Circuit Designer
From: Jim Thompson on 28 Mar 2006 23:11 On Tue, 28 Mar 2006 19:01:03 -0600, John Fields <jfields(a)austininstruments.com> wrote: >On Tue, 28 Mar 2006 16:08:01 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: > >>In some prior posts there have been inquiries regarding low distortion >>oscillators. >> >>Out of curiosity I simulated a 200Hz oscillator made simply from an >>A1A-style gyrator BP filter, then wrapped a positive feedback loop >>around it, with back-to-back diodes used to limit the drive to the >>input to the BP filter. >> >>Result: 3rd harmonic was at -58dB > >--- >And the circuit file is where??? I'll post it in a few minutes. Just got back from the hospital where my youngest son (33 years old) is being treated for colon cancer that has spread to lungs and liver :-( ...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.
From: Jim Thompson on 28 Mar 2006 23:18 On Tue, 28 Mar 2006 21:11:47 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >On Tue, 28 Mar 2006 19:01:03 -0600, John Fields ><jfields(a)austininstruments.com> wrote: > >>On Tue, 28 Mar 2006 16:08:01 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >> >>>In some prior posts there have been inquiries regarding low distortion >>>oscillators. >>> >>>Out of curiosity I simulated a 200Hz oscillator made simply from an >>>A1A-style gyrator BP filter, then wrapped a positive feedback loop >>>around it, with back-to-back diodes used to limit the drive to the >>>input to the BP filter. >>> >>>Result: 3rd harmonic was at -58dB >> >>--- >>And the circuit file is where??? > >I'll post it in a few minutes. > >Just got back from the hospital where my youngest son (33 years old) >is being treated for colon cancer that has spread to lungs and liver >:-( > > ...Jim Thompson See... Newsgroups: alt.binaries.schematics.electronic Subject: Oscillator Schematic (from S.E.D) - GyratorFilter_A1A_Oscillator.pdf Message-ID: <te2k2216buu9o8klbqg7rd0gaii8ge9joa(a)4ax.com> ...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.
From: Ban on 29 Mar 2006 00:24
Jim Thompson wrote: > > Just got back from the hospital where my youngest son (33 years old) > is being treated for colon cancer that has spread to lungs and liver > :-( > Jim, I am with you and your wife in this hard time. -- All the Best Ban Apricale, Italy |