"generate stable high -frequency signals with d flip-flops as digital
mixers ans all -IC low frequency phase -locked loop", by R.Treadway and
L.J. Reed, page 78 Electronic design 1 January 1972
Resistot array denounces D flip-flop mixer page 184 EDN 12 April 1990
digital frequency subtract or EDN 1 April 1981
Kamil Kraus: Die Arbeitsweise eines einfachen Digitalmischer, Seite 72
Elektronik Heft 24, 1980 a very good explanation of the function of the
digital mixer-- in German
Design ideas; D flip-flop sutracs frequencies by Richard Kochis,
Hewlett-PackardCo Ft. Collins ,CO, Gerald Flachs , New Mexico State
University, Las Cruces, END 15 April, 10981 page 149
Robert a Pease National Semiconductor Corp : Four ICs subtract
frequencies, EDN 1 April 1981
"Digitalis keverofokozat tervezese", Zombay Frerenc, Radiotechnika,
Seite 244 # 5 1996, a complete design of the digital mixer with
detailed theory and example in three consecutive issue of the magazine
Radiotechnika -- in Hungarian.
By using that literature I designed many frequency synthesizers
containing D flip-flops as a digital mixer
73
KJ6 UHN
Alex
[alias Dr.Dipl.Ing. Alexander Pummer, PCS Consultants]
US patents: many if you are interested I will send you a list
On 1/10/2016 10:56 AM, Attila Kinali wrote:
On Sun, 10 Jan 2016 14:30:41 +0100
Magnus Danielson <[email protected]> wrote:
SR-flipflop? Are you refering to the JK-FF phase detector or the PFD?
A straight SR-flipflop. I would have written JK-FF or PFD if I meant it.
Also, as I mentioned the PFD directly after, you could have concluded
that was not what I intended.
A SR-flip-flop with no illegal input states is easy to build from a 74HC00.
The illegal input states were my concern, indeed. And a quick google
didn't show up anything to disperse these....not until I started reading
the 4046 datasheet in detail.
But there is one thing about the arangement of the SR FF in the 4046[1]
that bothers me:
Although S = R = 1 is valid, it does lead to the output oscillating
between 0 and 1.
Attila Kinali
[1] Ti CD74HC4046A Datasheet
http://www.ti.com/lit/ds/symlink/cd54hc4046a.pdf
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