single op-amp window comparator

[Lee]

Not really. You loose a lot of accuracy because of the diode drops
but

for moderatly large values of random, you can get any values you want like

If you make this circuit and its top to bottom flipped version, the Vx
voltages are determined by R1 and R2 or Vin depending on Vin.

!
/
\ R1
/
\
!
Vin -!<--+
V
---
+-------- Vx
!
/
\ R2
/
\
!

Further resistor dividers on the Vx and Vx' signals can give you whatever
dead band you want. As a result, you can set the deadband and the center

i cant seem to understand the circuit...where do i connect the
positive and negative terminal of the op-amp to this circuit...and
does this apply to any comparator op-amp.tnx

 

[Ken Smith]

Modified drawing

+V
!
/
\ R1 +V
/ !
\ \
D1 ! /
Vin -!<--+ \ R4
V /
D2--- R3 !
+--/\/\----+---- to one input of the op amp
! the mirror image version goes
/ to the other
\ R2
/
\
!
-V

**************** Mirror image along here **************

i cant seem to understand the circuit...where do i connect the
positive and negative terminal of the op-amp to this circuit...and
does this apply to any comparator op-amp.tnx

You make a mirror image along the horz line.

R1 and R2 are much lower values than R3 and R4

 

[[email protected]]

Modified drawing

**************** Mirror image along here **************

You make a mirror image along the horz line.

R1 and R2 are much lower values than R3 and R4

thanks Ken, wasnt familiar with that one.

NT

 

[GPG]

LTC1042