. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. NOISE Substituting in 1 i+^+'-«^ ^6V. Si 1 + *, The gain ^f^in ^ R + r„ In a typical case i? = 30 kQ, r„ = 10 kD, g„, = 5 mA/V, /^ = 50. Then (i? + ra)l(raf^) = 0-08, which is <^1. Therefore gain ^ ^^i?, as for a pentode. HT+. 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
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. NOISE Substituting in 1 i+^+'-«^ ^6V. Si 1 + *, The gain ^f^in ^ R + r„ In a typical case i? = 30 kQ, r„ = 10 kD, g„, = 5 mA/V, /^ = 50. Then (i? + ra)l(raf^) = 0-08, which is <^1. Therefore gain ^ ^^i?, as for a pentode. HT+. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
Size: 1447px × 1727px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, bookleafnumber274
