Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2320638A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens and Halske AG, Siemens AGfiledCriticalSiemens and Halske AG
Priority to GB2320638ApriorityCriticalpatent/GB503722A/en
Publication of GB503722ApublicationCriticalpatent/GB503722A/en
H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
Landscapes
Engineering & Computer Science
(AREA)
Power Engineering
(AREA)
Investigating Or Analyzing Materials By The Use Of Magnetic Means
(AREA)
Abstract
503,722. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd. (Siemens & Halske Akt.-Ges.) Aug. 5, 1938, No. 23206. [Class 40 (v)] In a negative feedback amplifier the feedback path includes a network comprising a negative resistance device and arranged to determine the phase rotation in the feedback path. Fig. 1 shows the equivalent of a negative inductance and comprises resistances R, condenser'C and a negative resistance -R which may be a dynatron, or a hot conductor such as uranium dioxide the properties of which are described in Specification 466,132. This negative inductance -L in the network LR1, Fig. 2, gives a frequency dependent but real resistance with zero phase-rotation.
GB2320638A1938-08-051938-08-05Amplifier with negative feedback
ExpiredGB503722A
(en)
Improvements in or relating to electrical circuit arrangements for use in connectionwith gas devices and other similar apparatus exhibiting negative resistance characteristics
A condenser protection device of the type that is used in the coupling circuits for the superposition of musical frequency currents in distribution networks (Machine-translation by Google Translate, not legally binding)