GB1312943A – Current-switching amplifiers
– Google Patents
GB1312943A – Current-switching amplifiers
– Google Patents
Current-switching amplifiers
Info
Publication number
GB1312943A
GB1312943A
GB1818070A
GB1818070A
GB1312943A
GB 1312943 A
GB1312943 A
GB 1312943A
GB 1818070 A
GB1818070 A
GB 1818070A
GB 1818070 A
GB1818070 A
GB 1818070A
GB 1312943 A
GB1312943 A
GB 1312943A
Authority
GB
United Kingdom
Prior art keywords
transistors
potential
amplifier
current
inductor
Prior art date
1969-05-05
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
GB1818070A
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.)
Unisys Corp
Original Assignee
Burroughs Corp
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.)
1969-05-05
Filing date
1970-04-16
Publication date
1973-04-11
1970-04-16
Application filed by Burroughs Corp
filed
Critical
Burroughs Corp
1973-04-11
Publication of GB1312943A
publication
Critical
patent/GB1312943A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
230000008878
coupling
Effects
0.000
abstract
1
238000010168
coupling process
Methods
0.000
abstract
1
238000005859
coupling reaction
Methods
0.000
abstract
1
238000013016
damping
Methods
0.000
abstract
1
230000000694
effects
Effects
0.000
abstract
1
230000001939
inductive effect
Effects
0.000
abstract
1
239000013598
vector
Substances
0.000
abstract
1
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03F—AMPLIFIERS
H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F3/72—Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
G—PHYSICS
G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
G09G1/04—Deflection circuits ; Constructional details not otherwise provided for
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03F—AMPLIFIERS
H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F3/26—Push-pull amplifiers; Phase-splitters therefor
Abstract
1312943 Transistor amplifying and switching circuits; cathode-ray tube displays BURROUGHS CORP 16 April 1970 [5 May 1969] 18180/70 Headings H3T and H4T An amplifier suitable for rapidly switching from one inductive load 161 to another 166 (e.g. deflection coils in an alpha-numeric C.R.T. display) comprises a pair of independently controlled current drivers (transistors 121, 126) connected to a first potential (-10 v.), a first pair of diode devices 151, 156 coupling the output of the drivers with a second potential ( – 50 v.), and a second pair of diode devices 131, 136 connecting the drivers to the loads, the other terminals of which are connected to a third potential (+ 10v.). The object is to provide for the stored energy when a load is switched off and to provide a higher than normal voltage during the change-over period. As shown, input signals at 101 via pre-amplifier 100 control common emitter transistors 121, 126, which in turn control common base transistors 131, 136. Further transistors 191, 196 are made conductive when the difference between the voltage across load resistors 171, 176 and the corresponding input voltages exceeds a predetermined amount, thus providing a high voltage across each inductor for rapid gross positioning of the C.R.T. beam. Since the energy stored (in the C.R.T. yoke) is common to both loads one, e.g. 161, can be switched off immediately; this causes current flow in the other, 166, in the opposite to normal direction (upwards as shown) and this is opposed by the 60 v. potential between + 10 v. and- 50 v. via 156, causing rapid decay. At current zero 196 is turned on to cause rapid build-up, after which normal conduction occurs through 126, 136. In one alternative embodiment (Fig. 2, not shown) each channel comprises two pairs of transistors. During transfer the lower (input) transistors only go off, the upper ones conducting the decaying inductor current to a potential of + 13 volts, maintained by a Zener diode (274). This potential source also supplies current to the transistors in the other channel when they are first turned on, before current flows through the corresponding inductance. In this case the inductors are normally connected to a +13 volt supply but for rapid positioning an external signal turns on transistors (293, 286, 284) to apply + 40 volts. In a third embodiment (Fig. 3, not shown) a two-transistor per channel arrangement is described in conjunction with input circuits in which signals representing alpha-numeric symbols, symbol size, or vectors are amplified and pass through networks (305, 325) which compensate for the effect on the amplifier characteristic of critical damping, which is applied to the inductors in this case. The input signals are then applied to a first differential amplifier, another input to which is an adjustable centralizing voltage, and the output of this is applied via a second amplifier to an emitter follower stage (Q12, Q13) which controls the inductor amplifiers. Negative feedback from both the emitter follower and the inductor amplifiers is combined with the inputs to the first differential amplifier.
GB1818070A
1969-05-05
1970-04-16
Current-switching amplifiers
Expired
GB1312943A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US82160869A
1969-05-05
1969-05-05
Publications (1)
Publication Number
Publication Date
GB1312943A
true
GB1312943A
(en)
1973-04-11
Family
ID=25233824
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1818070A
Expired
GB1312943A
(en)
1969-05-05
1970-04-16
Current-switching amplifiers
Country Status (6)
Country
Link
US
(1)
US3611001A
(en)
JP
(1)
JPS5237333B1
(en)
BE
(1)
BE749284A
(en)
DE
(1)
DE2018923C3
(en)
FR
(1)
FR2046224A5
(en)
GB
(1)
GB1312943A
(en)
Families Citing this family (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1331265A
(en)
*
1970-08-14
1973-09-26
Redifon Ltd
Electronic switching circuit arrangements
US3780339A
(en)
*
1971-05-03
1973-12-18
Computer Power Systems Inc
High speed switching circuit for driving a capacitive load
DE2130979A1
(en)
*
1971-06-22
1973-01-11
Siemens Ag
ACTIVE CIRCUIT ARRANGEMENT FOR GENERATING CORRECTION CURRENTS FOR THE LATERAL CONVERGENCE OF THE COLOR RAYS OF A COLOR TUBE
US3778671A
(en)
*
1971-09-29
1973-12-11
Litton Systems Inc
Differential magnetic deflection amplifier
US4164688A
(en)
*
1976-10-04
1979-08-14
The Solartron Electronic Group Limited
Deflection amplifier
FR2770053B1
(en)
*
1997-10-22
2000-01-07
Sgs Thomson Microelectronics
DOUBLE GAIN AMPLIFIER CIRCUIT
ATE507613T1
(en)
*
2007-12-19
2011-05-15
Alcatel Lucent
METHOD FOR SIGNAL AMPLIFICATION, POWER SWITCHED AMPLIFIER SYSTEM, BASE STATION, MOBILE STATION AND COMMUNICATIONS NETWORK THEREOF
Family Cites Families (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3325803A
(en)
*
1964-10-01
1967-06-13
Ibm
Deflection control circuit
US3479553A
(en)
*
1967-09-22
1969-11-18
Burroughs Corp
Deflection amplifier
1969
1969-05-05
US
US821608A
patent/US3611001A/en
not_active
Expired – Lifetime
1970
1970-04-16
GB
GB1818070A
patent/GB1312943A/en
not_active
Expired
1970-04-20
FR
FR7014185A
patent/FR2046224A5/fr
not_active
Expired
1970-04-20
DE
DE2018923A
patent/DE2018923C3/en
not_active
Expired
1970-04-21
BE
BE749284D
patent/BE749284A/en
not_active
IP Right Cessation
1970-04-21
JP
JP45034245A
patent/JPS5237333B1/ja
active
Pending
Also Published As
Publication number
Publication date
JPS5237333B1
(en)
1977-09-21
BE749284A
(en)
1970-10-01
US3611001A
(en)
1971-10-05
DE2018923A1
(en)
1970-11-12
FR2046224A5
(en)
1971-03-05
DE2018923C3
(en)
1980-12-11
DE2018923B2
(en)
1980-04-17
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Legal Events
Date
Code
Title
Description
1973-08-22
PS
Patent sealed [section 19, patents act 1949]
1985-12-24
PCNP
Patent ceased through non-payment of renewal fee
