Don,
You haven't explained how much you want to pull the oscillator, but assuming
it's less than 1ppm, what you suggest is quite viable. Replace one of the caps
in the Pierce oscillator PI network (preferably the output one) with an NPO one
of slightly smaller value and add across it a
Hello all:
I've developed a need for pulling crystal oscillators built in to pll
circuits. These are cmos, and have the common style oscillator circuit
built in. The crystal is across an inverter in the chip, and there is a
small cap between each end of the crystal and ground.
The chips are pll's
Message-
From: Don Latham d...@montana.com
Sender: time-nuts-boun...@febo.com
Date: Sat, 5 Mar 2011 02:06:18
To: time nutstime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] pulling oscillators
Hello all:
I've
Capacitively couple a Varactor (or back biased diode) to the circuit and
vary the diode bias to tune.
-John
Hello all:
I've developed a need for pulling crystal oscillators built in to pll
circuits. These are cmos, and have the common style oscillator circuit
built in. The
I might ask the question how much pulling are you looking to do???
Regards
On Sat, Mar 5, 2011 at 5:09 AM, J. Forster j...@quik.com wrote:
Capacitively couple a Varactor (or back biased diode) to the circuit and
vary the diode bias to tune.
-John
Hello all:
I've
paul swed wrote:
I might ask the question how much pulling are you looking to do???
Regards
Yes, your request is meaningless without this number.
Having said that, you have 2 strikes against you. Trying
to pull an oscillator that wasn't designed to be pulled
is a problem. Secondly, the
Don,
if you have a reference oscillator of the right frequency, what's the
the purpose of trying to pull a CMOS oscillator to the same frequency,
rather than just using the reference frequency?
Please be more specific on whant your requirements are.
Adrian
Don Latham schrieb:
Hello all:
Hi Don,
I wrote a design idea about designing that circuit in EDN in 2003.
Search google for Jackson Vcxo
Not that hard to do if you can add a number of passive components to your pcb.
Bye,
Said
Sent from my iPad
On Mar 5, 2011, at 1:06, Don Latham d...@montana.com wrote:
Hello all:
I've
The crystal oscillators are reference oscillators in 2 meter ham radios. I
wanted to make the least perturbation in the radio, hence pulling instead
of simply introducing the correct reference. I will be using a reference
of the nominal frequency the radio should have, so really should not need
to
Don
If you search the web, someone used inductive coupling to the inductor
in the oscillator ckt of a 706. I don't recall if it had the high
precision osc in it. they were using the rig for satellite work.
good luck
Rix Seacord K2AVP
eseac...@verizon.net
845-628-0892
914-262-9186
On
...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Don Latham
Sent: Saturday, March 05, 2011 11:52 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] pulling oscillators
The crystal oscillators are reference oscillators in 2 meter ham radios. I
wanted
of precise time and frequency measurement
Subject: Re: [time-nuts] pulling oscillators
The crystal oscillators are reference oscillators in 2 meter ham radios. I
wanted to make the least perturbation in the radio, hence pulling instead
of
simply introducing the correct reference. I will be using
: Saturday, March 05, 2011 11:52 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] pulling oscillators
The crystal oscillators are reference oscillators in 2 meter ham radios. I
wanted to make the least perturbation in the radio, hence pulling instead of
simply
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