R
Richard Rasker
Hello,
I recall having seen a rather simple circuit with 2 opamps (IIRC) which
could switch from inverting to non-inverting operation by means of
switching a single transistor or FET on and off -- but I can't find it
anywhere anymore.
For a particular type of ramp generator, I need to switch electronically
between two voltages, mirrored around a reference voltage of 1.25V -- e.g.
1.0V and 1.5V, or 0.7V and 1.8V etcetera.
Sure, I can build a simple opamp inverter with 1.25V at its + input, and use
a 4053 two-channel multiplexer gate to switch between the input and output
voltages, but that seems like a bit of waste in terms of devices and PCB
space.
Can anyone remember how this was done? Thanks already for any suggestions.
Richard Rasker
I recall having seen a rather simple circuit with 2 opamps (IIRC) which
could switch from inverting to non-inverting operation by means of
switching a single transistor or FET on and off -- but I can't find it
anywhere anymore.
For a particular type of ramp generator, I need to switch electronically
between two voltages, mirrored around a reference voltage of 1.25V -- e.g.
1.0V and 1.5V, or 0.7V and 1.8V etcetera.
Sure, I can build a simple opamp inverter with 1.25V at its + input, and use
a 4053 two-channel multiplexer gate to switch between the input and output
voltages, but that seems like a bit of waste in terms of devices and PCB
space.
Can anyone remember how this was done? Thanks already for any suggestions.
Richard Rasker