Consider, for example, a common-emitter BJT amplifier. Adding an inductor in series with each of the base biasing voltage divider resistors will, as far as I can see, increase its input impedance a bit. This is likely to allow a higher biasing DC current without hurting the input signal. Given the inductance is high enough, the input impedance will be almost equal to emitter AC-to-ground path's impedance, which is a bit higher than without inductors.
But I'm not sure how to protect against turn-on/off voltage spikes. Adding diodes in parallel with those inductances would hurt the AC signal. Of course, I could calculate for the best trade-off between AC reactance and turn-on/off voltage (according to max. VBE and VCE for that transistor).
But is this a good idea at all, is it worth the trouble? Or it can't be used because of what I just anticipated?
But I'm not sure how to protect against turn-on/off voltage spikes. Adding diodes in parallel with those inductances would hurt the AC signal. Of course, I could calculate for the best trade-off between AC reactance and turn-on/off voltage (according to max. VBE and VCE for that transistor).
But is this a good idea at all, is it worth the trouble? Or it can't be used because of what I just anticipated?