GB516358A - Stabilized negative resistance and conductance devices - Google Patents

Stabilized negative resistance and conductance devices

Info

Publication number
GB516358A
GB516358A GB1842338A GB1842338A GB516358A GB 516358 A GB516358 A GB 516358A GB 1842338 A GB1842338 A GB 1842338A GB 1842338 A GB1842338 A GB 1842338A GB 516358 A GB516358 A GB 516358A
Authority
GB
United Kingdom
Prior art keywords
negative
dependent
output
resistance
feed
Prior art date
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
GB1842338A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1842338A priority Critical patent/GB516358A/en
Publication of GB516358A publication Critical patent/GB516358A/en
Priority to FR856156D priority patent/FR856156A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/16—Control of transmission; Equalising characterised by the negative-impedance network used

Abstract

516,358. Valve circuits. STANDARD TELEPHONES & CABLES, Ltd., and JACOBSEN, B. B. June 21, 1938, No. 18423. [Class 40(v)] A stabilized negative resistance or conductance device adopted to compensate for the positive dissipation of a tuned circuit, wave filter, or network, comprises amplifying valves, e.g. of pentode type, provided with both positive and negative feed-back circuits. The negative resistance or conductance may be temperaturedependent such that it compensates for the temperature-dependent loss in the tuned circuit &c. with which it is associated, and may also be frequency-dependent by using a frequency-dependent positive or negative feedback. Fig. 6 shows a negative-conductance arrangement comprising two pentodes VI, V2 associated with a tuned circuit Lo, Co in the output circuit. An output-voltage-dependent positive feed-back connection P is taken from a potentiometer B, B1 in the output of V2 to the input grid of V1, and an output-currentdependent negative feed-back connection N is taken from a resistance R7 in the cathode lead of V2. Fig. 7 shows a negative-conductance arrangement associated with a tuned circuit C1, L1 in the input circuit and having an outputvoltage-dependent positive feed-back from potentiometer R3, R4, R5 and an outputvoltage -dependent negative feed-back N over resistance D. In a modification, Fig. 8 (not shown), the impedance of the input circuit is matched by the inclusion of a pad having the same characteristic impedance, the output of the pad being connected into the tuned circuit L1, C1. A temperature-dependent effect may be obtained by making resistance R5 of copper and R4 of a material of very low temperature coefficient and suitably proportioning R4 and R5, or by making part of resistance D of copper. Other arrangements are shown, Figs 9 and 10 (not shown), providing negative resistance devices, having output-current-dependent positive feed-back and output-voltagedependent or current-dependent negative feedback.
GB1842338A 1938-06-21 1938-06-21 Stabilized negative resistance and conductance devices Expired GB516358A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1842338A GB516358A (en) 1938-06-21 1938-06-21 Stabilized negative resistance and conductance devices
FR856156D FR856156A (en) 1938-06-21 1939-06-13 Stabilized negative conductance or resistance devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1842338A GB516358A (en) 1938-06-21 1938-06-21 Stabilized negative resistance and conductance devices

Publications (1)

Publication Number Publication Date
GB516358A true GB516358A (en) 1939-01-01

Family

ID=10112187

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1842338A Expired GB516358A (en) 1938-06-21 1938-06-21 Stabilized negative resistance and conductance devices

Country Status (2)

Country Link
FR (1) FR856156A (en)
GB (1) GB516358A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442770A (en) * 1943-04-20 1948-06-08 Sperry Corp Pulse generator
US2468302A (en) * 1943-10-05 1949-04-26 Bell Telephone Labor Inc Quadrature phase shifting circuit
US2742616A (en) * 1949-08-30 1956-04-17 Bell Telephone Labor Inc Negative impedance repeaters
US2788397A (en) * 1953-11-10 1957-04-09 Westinghouse Electric Corp Wideband communications amplifier
US2808472A (en) * 1953-07-10 1957-10-01 Philips Corp Audio frequency amplifier with variable frequency characteristic

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2843741A (en) * 1955-10-17 1958-07-15 Rca Corp Reactance tube circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442770A (en) * 1943-04-20 1948-06-08 Sperry Corp Pulse generator
US2468302A (en) * 1943-10-05 1949-04-26 Bell Telephone Labor Inc Quadrature phase shifting circuit
US2742616A (en) * 1949-08-30 1956-04-17 Bell Telephone Labor Inc Negative impedance repeaters
US2808472A (en) * 1953-07-10 1957-10-01 Philips Corp Audio frequency amplifier with variable frequency characteristic
US2788397A (en) * 1953-11-10 1957-04-09 Westinghouse Electric Corp Wideband communications amplifier

Also Published As

Publication number Publication date
FR856156A (en) 1940-06-03

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