[time-nuts] ? phase comparison or other device

Dr Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jun 30 20:09:55 EDT 2007

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.

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