SE321506B - - Google Patents

Info

Publication number
SE321506B
SE321506B SE834/65A SE83465A SE321506B SE 321506 B SE321506 B SE 321506B SE 834/65 A SE834/65 A SE 834/65A SE 83465 A SE83465 A SE 83465A SE 321506 B SE321506 B SE 321506B
Authority
SE
Sweden
Prior art keywords
input
transistor
inductor
network
low
Prior art date
Application number
SE834/65A
Inventor
R Arseneau
Original Assignee
Standard Radio & Telefon
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 Radio & Telefon filed Critical Standard Radio & Telefon
Publication of SE321506B publication Critical patent/SE321506B/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
    • H04Q3/521—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using semiconductors in the switching stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/46—One-port networks
    • H03H11/48—One-port networks simulating reactances

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Networks Using Active Elements (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

1,046,711. Transistor reactance circuits; automatic exchange systems. STANDARD TELEPHONES & CABLES Ltd. Jan. 22, 1965 [Jan. 24, 1964], No. 2890/65. Headings H3R and H4K. A transistor circuit, Fig. 1, simulates an inductor having high A.C. impedance but low resistance between the input 50 and ground. A PNP transistor 51 is normally forwardly biased by potentiometers 53-55, 56-58 when the input 50 is at a desired potential, the collector output being applied to a grounded emitter NPN transistor 52 whose collector is directly connected back to the input 50 which is also capacitively coupled at 54 to the base of transistor 51. The capacitor 54 may be variable to vary the inductor effect and the circuit shows positive or negative A.C. input impedance dependent on the relative value of resistor 55. A D.C. or low-frequency input at 50 is unaffected by the capacitor 54, is amplified by both transistors and increases or decreases correspondingly the conductivity of transistor 52 shunting the input so that the input impedance is low. Such an inductor circuit 61, Fig. 2 (not shown), may be used in the telephone system described in Specification 953,895 to provide a low resistance path to earth for the battery B1 via the constant current source 66, diode network 62 and diode 72. The secondary of the repeat coil 65, terminating the subscriber's line 60, is in this case capacitively coupled at 68 to the network 62 and thus the previous need for completing the D.C. holding path for the network 62 through the repeat coil secondary is avoided. The diodes 71, 72 together form a gate which is opened when a call involving subscriber line 60 is to be made.
SE834/65A 1964-01-24 1965-01-22 SE321506B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US340011A US3343003A (en) 1964-01-24 1964-01-24 Transistor inductor

Publications (1)

Publication Number Publication Date
SE321506B true SE321506B (en) 1970-03-09

Family

ID=23331509

Family Applications (1)

Application Number Title Priority Date Filing Date
SE834/65A SE321506B (en) 1964-01-24 1965-01-22

Country Status (9)

Country Link
US (1) US3343003A (en)
BE (1) BE658743A (en)
CH (1) CH436396A (en)
DE (1) DE1288158B (en)
ES (1) ES308458A1 (en)
FR (1) FR1422617A (en)
GB (1) GB1046711A (en)
NL (1) NL6500683A (en)
SE (1) SE321506B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1424482A (en) * 1964-12-01 1966-01-14 Csf inductive reactance integrated electric circuit element
US3414824A (en) * 1966-07-11 1968-12-03 Allen Bradley Co Active low pass filter
US3400335A (en) * 1966-12-02 1968-09-03 Automatic Elect Lab Integratable gyrator using mos and bipolar transistors
US3397363A (en) * 1967-01-03 1968-08-13 Zenith Radio Corp Controllable simulated inductor using tetrode transistors
US3483477A (en) * 1967-10-25 1969-12-09 Fairchild Camera Instr Co Broadband amplifier with semiconductor interstage element
US3594593A (en) * 1969-05-02 1971-07-20 Stanford Research Inst Active impedance matching of microwave acoustic devices
US3623133A (en) * 1969-11-12 1971-11-23 Bell Telephone Labor Inc Two-terminal inductorless electronic reactor
DE2030843C3 (en) * 1970-03-23 1973-10-11 Aktiengesellschaft Brown Boveri & Cie., Baden (Schweiz) Two-pole with negative resistance and use of the two-pole in a DC / DC converter
US3732441A (en) * 1971-05-07 1973-05-08 Zenith Radio Corp Surface wave integratable filter for coupling a signal source to a load

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892165A (en) * 1954-10-27 1959-06-23 Rca Corp Temperature stabilized two-terminal semi-conductor filter circuit
US2892164A (en) * 1954-10-27 1959-06-23 Rca Corp Semi-conductor filter circuits
DE1003803B (en) * 1955-04-05 1957-03-07 Philips Nv Electrical two-pole with relatively low direct current and relatively high alternating current impedance
BE551746A (en) * 1955-10-14
US3001157A (en) * 1959-10-30 1961-09-19 Bell Telephone Labor Inc Nonreciprocal wave translating network
BE628335A (en) * 1960-03-23 1900-01-01
US3152309A (en) * 1960-08-23 1964-10-06 Philco Corp Simulated high-q inductor

Also Published As

Publication number Publication date
CH436396A (en) 1967-05-31
GB1046711A (en) 1966-10-26
DE1288158B (en) 1969-01-30
BE658743A (en) 1965-07-26
FR1422617A (en) 1965-12-24
US3343003A (en) 1967-09-19
NL6500683A (en) 1965-07-26
ES308458A1 (en) 1965-05-01

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