What XTAL OSC is this?
in [Design]
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From: Jim Thompson on 2 May 2010 11:28 On Sun, 2 May 2010 11:19:53 +0100, "Andrew Holme" <ah(a)nospam.com> wrote: > >"Phil Hobbs" <pcdhSpamMeSenseless(a)electrooptical.net> wrote in message >news:4BDC98C5.5010503(a)electrooptical.net... >> Jim Thompson wrote: >>> On Sat, 1 May 2010 14:46:37 +0100, "Andrew Holme" <ah(a)nospam.com> >>> wrote: > >[big snip] > >> You're kidding with that bias scheme, right? You really want amplitude >> limiting from BJT saturation? Cutoff is much much quieter, but AGC is >> where it's at for simple oscillators (e.g. your MC1648 from long ago) and >> bridge circuits can pretty well eliminate phase noise due to the active >> devices. > >What sort of bridge is that Phil? Do you mean like in "A NEW TYPE OF >BALANCED-BRIDGE CONTROLLED OSCILLATOR" by R. K. Karlquist ? Can you provide >any references? > >TIA > And my scheme doesn't saturate IF you choose the right values... it's essentially current mode. I have a pair of 1648 look-alikes plus LOTS of other goodies coming out in a BIG chip (RSN :-), that I designed more than a year ago. The customer lurks here. Maybe, someday, he'll allow discussion :-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: Phil Hobbs on 2 May 2010 15:32
On 5/2/2010 6:19 AM, Andrew Holme wrote: > "Phil Hobbs"<pcdhSpamMeSenseless(a)electrooptical.net> wrote in message > news:4BDC98C5.5010503(a)electrooptical.net... >> Jim Thompson wrote: >>> On Sat, 1 May 2010 14:46:37 +0100, "Andrew Holme"<ah(a)nospam.com> >>> wrote: > > [big snip] > >> You're kidding with that bias scheme, right? You really want amplitude >> limiting from BJT saturation? Cutoff is much much quieter, but AGC is >> where it's at for simple oscillators (e.g. your MC1648 from long ago) and >> bridge circuits can pretty well eliminate phase noise due to the active >> devices. > > What sort of bridge is that Phil? Do you mean like in "A NEW TYPE OF > BALANCED-BRIDGE CONTROLLED OSCILLATOR" by R. K. Karlquist ? Can you provide > any references? > > TIA > > I have a book coming from abebooks in the next few days that's all about that--I'll let you know! Title: Phase Noise in Signal Sources/Theory and Applications Author: W. P. Robins Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net |