GB1232754A – – Google Patents
GB1232754A – – Google Patents
Info
Publication number
GB1232754A
GB1232754A
GB1232754DA
GB1232754A
GB 1232754 A
GB1232754 A
GB 1232754A
GB 1232754D A
GB1232754D A
GB 1232754DA
GB 1232754 A
GB1232754 A
GB 1232754A
Authority
GB
United Kingdom
Prior art keywords
output
integrator
comparator
sense
signal
Prior art date
1968-09-04
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
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.)
1968-09-04
Filing date
1969-08-05
Publication date
1971-05-19
1969-08-05
Application filed
filed
Critical
1971-05-19
Publication of GB1232754A
publication
Critical
patent/GB1232754A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G06—COMPUTING; CALCULATING OR COUNTING
G06G—ANALOGUE COMPUTERS
G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
G06G7/16—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division
G06G7/161—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division with pulse modulation, e.g. modulation of amplitude, width, frequency, phase or form
Abstract
1,232,754. Multiplying circuits. BENDIX CORP. 5 Aug., 1969 [4 Sept., 1968], No. 39183/69. Heading G4G. A time division multiplier circuit includes means for producing a first, a second, and a reference signal; an integrator for integrating the first signal, and a comparator for comparing the integrator output to a predetermined voltage level and for providing a sense of output dependent upon the comparison; and switching means connected to the integrator, the comparator, and the reference signal and second signal means, and responsive to the sense of the comparator output for summing the reference signal into the integrator to drive the integrator output in the opposite sense and produce a sawtooth waveform which has a duty cycle proportional to the first signal and gates the second signals, whereby to provide a pulse train which, when passed through a filter connected to the switching means, provides an output corresponding to the product of the first and second signals. In the circuit shown, for multiplying together signals E 1 and E 2 from sources 2 and 4, signal E 1 is fed to an integrator 12, to which a bias voltage from source 28 may be applied via a switch 10, the output from the integrator being applied to the comparator 14, which has an output of fixed amplitude the sense of which is determined by the amplitude of the input. When the integrator output attains a given value, requring a time b, it produces a reversal in sense of the output of the comparator 14, such that relay 18 is operated via the diode 16, to reverse the positions of switches 4, 10 and 20. The negative voltage 28 is thereby applied to the integrator via associated resistors and the summing element 8, producing a reversal of sense of the integrator output and a decrease in its rate of change such that the next reversal of the comparator output, to initiate repetition of the cycle, occurs after a further time a. During time a, since switch 4 is closed, the signal E 2 is applied to filter 9 which provides an output equal to the average of its input; since the amplitude of the pulse is E 2 , while the ratio a/a + b is proportional to E 1 , the output from the filter is proportional to the product E 1 , E 2 . The integrator and comparator include operational amplifiers, and switches 4, 10 and 20 employ field effect transistors.
GB1232754D
1968-09-04
1969-08-05
Expired
GB1232754A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US75723768A
1968-09-04
1968-09-04
Publications (1)
Publication Number
Publication Date
GB1232754A
true
GB1232754A
(en)
1971-05-19
Family
ID=25046970
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1232754D
Expired
GB1232754A
(en)
1968-09-04
1969-08-05
Country Status (4)
Country
Link
US
(1)
US3588713A
(en)
DE
(1)
DE1944760A1
(en)
FR
(1)
FR2019403B1
(en)
GB
(1)
GB1232754A
(en)
Families Citing this family (16)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3662187A
(en)
*
1971-07-01
1972-05-09
Us Navy
Fast analog multiplier
US3736528A
(en)
*
1971-11-24
1973-05-29
Honeywell Inf Systems
Voltage controlled oscillator
US3743951A
(en)
*
1972-04-26
1973-07-03
Us Navy
Voltage controlled up-down clock rate generator
US4015140A
(en)
*
1974-05-30
1977-03-29
General Electric Company
Multiplier for producing phase shift error-free signal representing product of out-of-phase inputs
US4005283A
(en)
*
1975-09-22
1977-01-25
Rockwell International Corporation
Squaring circuit apparatus
US4005284A
(en)
*
1975-09-22
1977-01-25
Rockwell International Corporation
Analog signal to duty cycle conversion apparatus
US4021658A
(en)
*
1975-09-22
1977-05-03
Rockwell International Corporation
Angular rate deriving apparatus
US4039897A
(en)
*
1976-03-08
1977-08-02
Dragoset James E
System for controlling power applied to a gas discharge lamp
US4071777A
(en)
*
1976-07-06
1978-01-31
Rca Corporation
Four-quadrant multiplier
US4074194A
(en)
*
1977-02-28
1978-02-14
Wilkerson A W
Watt meter providing electrical signal proportional to power
US4656871A
(en)
*
1985-07-16
1987-04-14
Motorola, Inc.
Capacitor sensor and method
JPS6423607A
(en)
*
1987-07-17
1989-01-26
Otis Elevator Japan
Multiphase multiplier circuit
US4940107A
(en)
*
1988-09-23
1990-07-10
Trw Inc.
Method and apparatus for controlling a power assist steering system
US5008636A
(en)
*
1988-10-28
1991-04-16
Apollo Computer, Inc.
Apparatus for low skew system clock distribution and generation of 2X frequency clocks
US4931674A
(en)
*
1988-11-16
1990-06-05
United States Of America As Represented By The Secretary Of The Navy
Programmable analog voltage multiplier circuit means
US5157452A
(en)
*
1990-07-03
1992-10-20
Mitsubishi Denki Kabushiki Kaisha
Method and apparatus for liquid content detection with refractive index and temperature signal mixing
Family Cites Families (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB761785A
(en)
*
1953-12-31
1956-11-21
British Thomson Houston Co Ltd
Improvements relating to electrical measuring apparatus
1968
1968-09-04
US
US757237A
patent/US3588713A/en
not_active
Expired – Lifetime
1969
1969-08-05
GB
GB1232754D
patent/GB1232754A/en
not_active
Expired
1969-09-03
DE
DE19691944760
patent/DE1944760A1/en
active
Pending
1969-09-03
FR
FR696930009A
patent/FR2019403B1/fr
not_active
Expired
Also Published As
Publication number
Publication date
US3588713A
(en)
1971-06-28
FR2019403B1
(en)
1973-05-25
FR2019403A1
(en)
1970-07-03
DE1944760A1
(en)
1970-05-06
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Legal Events
Date
Code
Title
Description
1971-09-29
PS
Patent sealed [section 19, patents act 1949]
1980-03-19
PCNP
Patent ceased through non-payment of renewal fee
