. Electronic apparatus for biological research . Figure The cascode circuit also resembles the pentode circuit in that the input capacitance is low. The change in anode potential at the lower valve for a change of anode current di is not —diR but —6i{{R -\- rjj ju]. The Miller input capacitance is therefore reduced by a factor {(R + rj] fxR] — 1/37| of what it would be for a simple triode amphfier. REFERENCES ^ Starr, A. T. Radio and Radar Technique London; Pitman 2 Macfarlane, G. G. Soc. Lond. 59 (1941) 366 258

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