摘要:
Pre-saturation characteristics for various types of diodes indicate that for constant plate voltage, the product of plate current and plate resistance is constant for each diode. (idrpd=K). For different diodes, the value ofKvaries from 200 to 700 v. for a plate voltage of 125 v. Tubes with thoriated tungsten cathodes have the highestKvalues, withKproportional to plate voltage which renders the logarithmic characteristics linear and parallel. The pre-saturation diode when used as a load provides a high resistance that does not require an exceedingly large supply voltage. If the quiescent plate voltage,Ebo, is kept constant, the effective load lines converge at a common point, the voltage of which represents a virtual supply voltage equal toEbo+K. Voltage gain and maximum distortionless output are both greater than when a fixed resistance is used as load. Variation of the filament current of the diode, or of a self-bias resistor, provides a distortionless gain control. The gain is almost constant for frequencies less than 300 c.p.s. but for higher frequencies drops more rapidly.
ISSN:1923-4287
DOI:10.1139/cjr44a-004
出版商:NRC Research Press
年代:1944
数据来源: NRC