For those of you who are unfamiliar with the bipolar transistor feedback
limiter the attached schematic depicts it in use with both a
noninverting and an inverting amplifier.
The output voltage swing before clamping is limited by transistor Vbe
breakdown. However this can be oversome by adding a few diodes when a
larger output swing is required.
Unlike the simple shunt diode feedback clamp, the circuit noise gain is
less than 1 when the output is clamped. Off course the voltage noise at
one of the clamp transistor bases appears at the output when the output
is clamped. However this voltage is generally less than the power supply
and its noise can easily be made significantly lower.
Bruce
Bipolar transistor feedback limiter.pdf
Description: Adobe PDF document
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