Re: Digital Frequency Comparator

In article <S0RCg.5647$9T3.4261@xxxxxxxxxxxxxxxxxxxxxxxxxx>,
Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:
[....]
Nah, us analog guys have to come up with an analog answer here. Like
running each clock into an integrate&hold that is sampled at hold and
then reset. Follow that with an LM339 and a gate or mux that selects the
right clock. Then hollow out a big old digital chip from underneath, one
where nobody recognizes the part number anymore, glue it all in there,
connect to some pins, solder onto a board and declare it "digilog" :-)))

Like this:

*** input section ***

Clock 1 ----!!---+--->!---+-----+---- A
! ! !
--- --- -!N-JFET
^ --- !<--- X
! ! -!
GND GND !
\
/
\
!
-V

Clock 2 ----!!---+--->!---+-----+---- B
! ! !
--- --- -!N-JFET
^ --- !<--- X
! ! -!
GND GND !
\
/
\
!
-V


*** frequency compare ***
\
/
\
A---!\LM339 !
! >-----+---
B---!/

*** X driver ***

!
\
/
\
A---!-\ ! P-JFET
! >---+ !--- GND
2V---!+/ +--/\/\-+---<!
! ! !----+-----X
B---!-\ ! --- !
! >--- --- \
2V---!+/ ! /
GND \
!
-V
********

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