Forums

Oscillator type names.

Started by Ian Field January 20, 2016
Does anyone know the correct name for the 2 transistor LC oscillator that 
looks like a long tailed pair?

I though it was a Franklin oscillator - the google hits are ambiguous to say 
the least, but its possible I have the name wrong.

Thanks for any help. 

On Wed, 20 Jan 2016 18:59:22 +0000, Ian Field wrote:

> Does anyone know the correct name for the 2 transistor LC oscillator > that looks like a long tailed pair? > > I though it was a Franklin oscillator - the google hits are ambiguous to > say the least, but its possible I have the name wrong. > > Thanks for any help.
I'm not sure that all the variants have names. Most of the oscillators got names back in the teens and twenties before there was a unified theory of feedback in circuits, and when sustained radio oscillation was a Really Astonishing Thing. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
On Wed, 20 Jan 2016 14:07:44 -0600, Tim Wescott
<seemywebsite@myfooter.really> wrote:

>On Wed, 20 Jan 2016 18:59:22 +0000, Ian Field wrote: > >> Does anyone know the correct name for the 2 transistor LC oscillator >> that looks like a long tailed pair? >> >> I though it was a Franklin oscillator - the google hits are ambiguous to >> say the least, but its possible I have the name wrong. >> >> Thanks for any help. > >I'm not sure that all the variants have names. Most of the oscillators >got names back in the teens and twenties before there was a unified >theory of feedback in circuits, and when sustained radio oscillation was >a Really Astonishing Thing.
I avoid oscillator type names like the plague... does nothing but add confusion. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.

"Tim Wescott" <seemywebsite@myfooter.really> wrote in message 
news:ao-dnSQhGY-NdALLnZ2dnUU7-TednZ2d@giganews.com...
> On Wed, 20 Jan 2016 18:59:22 +0000, Ian Field wrote: > >> Does anyone know the correct name for the 2 transistor LC oscillator >> that looks like a long tailed pair? >> >> I though it was a Franklin oscillator - the google hits are ambiguous to >> say the least, but its possible I have the name wrong. >> >> Thanks for any help. > > I'm not sure that all the variants have names. Most of the oscillators > got names back in the teens and twenties before there was a unified > theory of feedback in circuits, and when sustained radio oscillation was > a Really Astonishing Thing.
The oscillator I have in mind, I could almost draw from memory. But I'd like some point of reference so I can google for more info.
Ian Field wrote:
> Does anyone know the correct name for the 2 transistor LC oscillator > that looks like a long tailed pair? > > I though it was a Franklin oscillator - the google hits are ambiguous > to say the least, but its possible I have the name wrong. > > Thanks for any help.
I've seen them called differential pair oscillators. That what you're looking for? Dave M
On Wed, 20 Jan 2016 18:29:17 -0600, "Dave M" <dgminala@mediacombb.net>
wrote:

>Ian Field wrote: >> Does anyone know the correct name for the 2 transistor LC oscillator >> that looks like a long tailed pair? >> >> I though it was a Franklin oscillator - the google hits are ambiguous >> to say the least, but its possible I have the name wrong. >> >> Thanks for any help. > > >I've seen them called differential pair oscillators. That what you're >looking for? > >Dave M >
Differential oscillators... <http://www.analog-innovations.com/SED/MC1648-DataSheet.pdf> <http://www.analog-innovations.com/SED/Pat-3649929.pdf> ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Am 20.01.2016 um 19:59 schrieb Ian Field:
> Does anyone know the correct name for the 2 transistor LC oscillator > that looks like a long tailed pair? > > I though it was a Franklin oscillator - the google hits are ambiguous to > say the least, but its possible I have the name wrong. > > Thanks for any help.
maybe Buttler osc.? Jorgen
Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
 Wrote in message:
> On Wed, 20 Jan 2016 18:29:17 -0600, "Dave M" <dgminala@mediacombb.net> > wrote: > >>Ian Field wrote: >>> Does anyone know the correct name for the 2 transistor LC oscillator >>> that looks like a long tailed pair? >>> >>> I though it was a Franklin oscillator - the google hits are ambiguous >>> to say the least, but its possible I have the name wrong. >>> >>> Thanks for any help. >> >> >>I've seen them called differential pair oscillators. That what you're >>looking for? >> >>Dave M >> > > Differential oscillators... > > <http://www.analog-innovations.com/SED/MC1648-DataSheet.pdf> > > <http://www.analog-innovations.com/SED/Pat-3649929.pdf> > > ...Jim Thompson > -- > | James E.Thompson | mens | > | Analog Innovations | et | > | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | > | San Tan Valley, AZ 85142 Skype: skypeanalog | | > | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | > | E-mail Icon at http://www.analog-innovations.com | 1962 | > > I love to cook with wine. Sometimes I even put it in the food. >
Emitter coupled oscillators? Current-steering oscillators? Advantage that they don't disturb the power supply very much? -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/
On Thu, 21 Jan 2016 10:24:37 -0500 (EST), bitrex
<bitrex@de.lete.earthlink.net> wrote:

>Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> > Wrote in message:
[snip]
>>> >> >> Differential oscillators... >> >> <http://www.analog-innovations.com/SED/MC1648-DataSheet.pdf> >> >> <http://www.analog-innovations.com/SED/Pat-3649929.pdf> >> >> ...Jim Thompson
[snip]
>> > >Emitter coupled oscillators? Current-steering oscillators?
Yes ;-)
> >Advantage that they don't disturb the power supply very much?
Yes. Easy to make sure they self-start. Easy to AGC (actually energy control) for high spectral purity... <http://www.analog-innovations.com/SED/VCOwithAGC.pdf> ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
 Wrote in message:
> On Thu, 21 Jan 2016 10:24:37 -0500 (EST), bitrex > <bitrex@de.lete.earthlink.net> wrote: > >>Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> >> Wrote in message: > [snip] >>>> >>> >>> Differential oscillators... >>> >>> <http://www.analog-innovations.com/SED/MC1648-DataSheet.pdf> >>> >>> <http://www.analog-innovations.com/SED/Pat-3649929.pdf> >>> >>> ...Jim Thompson > [snip] >>> >> >>Emitter coupled oscillators? Current-steering oscillators? > > Yes ;-) > >> >>Advantage that they don't disturb the power supply very much? > > Yes. > > Easy to make sure they self-start. > > Easy to AGC (actually energy control) for high spectral purity... > > <http://www.analog-innovations.com/SED/VCOwithAGC.pdf> > > ...Jim Thompson > --
Right, just basicallly inject the AGC control voltage into the current source driving the tail current. I think I built a little AM transmitter many years ago that worked that way - long tail pair with a crystal/LC positive feedback loop and the audio modulation driving the current source, then buffered with an emitter follower and LC antenna matching network. Seemed to work pretty good... -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/