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GB1337005A - Amplifier circuits - Google Patents

Amplifier circuits

Info

Publication number
GB1337005A
GB1337005A GB5423870A GB5423870A GB1337005A GB 1337005 A GB1337005 A GB 1337005A GB 5423870 A GB5423870 A GB 5423870A GB 5423870 A GB5423870 A GB 5423870A GB 1337005 A GB1337005 A GB 1337005A
Authority
GB
United Kingdom
Prior art keywords
control voltage
resistors
amplifier
output
series
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
GB5423870A
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.)
Vereinigte Flugtechnische Werke Fokker GmbH
Original Assignee
Vereinigte Flugtechnische Werke Fokker GmbH
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 Vereinigte Flugtechnische Werke Fokker GmbH filed Critical Vereinigte Flugtechnische Werke Fokker GmbH
Publication of GB1337005A publication Critical patent/GB1337005A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/26—Automatic controllers electric in which the output signal is a pulse-train
    • G05B11/28—Automatic controllers electric in which the output signal is a pulse-train using pulse-height modulation; using pulse-width modulation
    • 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
    • G06G7/18—Arrangements for performing computing operations, e.g. operational amplifiers for integration or differentiation; for forming integrals
    • G06G7/184—Arrangements for performing computing operations, e.g. operational amplifiers for integration or differentiation; for forming integrals using capacitive elements
    • 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
    • G06G7/18—Arrangements for performing computing operations, e.g. operational amplifiers for integration or differentiation; for forming integrals
    • G06G7/184—Arrangements for performing computing operations, e.g. operational amplifiers for integration or differentiation; for forming integrals using capacitive elements
    • G06G7/186—Arrangements for performing computing operations, e.g. operational amplifiers for integration or differentiation; for forming integrals using capacitive elements using an operational amplifier comprising a capacitor or a resistor in the feedback loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Feedback Control In General (AREA)
  • Amplifiers (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1337005 Gain control; pulse modulation systems VEREINIGTE FLUGTECHNISCHE WERKE-FOKKER GmbH 13 Nov 1970 [15 Nov 1969] 54238/70 Headings H3T H4L and H4R An amplifier circuit includes a network having two series-connected resistors, the network determining at least one parameter of the amplifier circuit, and periodic switching means of variable duty factor connected to the common point of the two resistors and so arranged as to switch periodically into and out of the network one of the resistors. Amplifier 32, Fig. 3, is provided with feedback by means of resistor 33, in conjunction with two series-connected resistors 30, 31, the junction point between which is periodically earthed by means of a switch 34 which may comprise a field-effect transistor. Switch 34 is controlled by a circuit 35 which produces a train of pulses whose width depends upon the value of the control voltage U st . The pulse repetition frequency is made higher than the frequency of the signal U e so that the effective value of the series resistors 30, 31 is proportional to the control voltage U st . The arrangement may be used in a three-term controller (Fig. 5, not shown). Circuit for producing width-controlled pulses.- A sawtooth wave is fed from source 15 via resistor 23 to one input of a comparator 16, and a control voltage U K via resistor 22 to the second input, sudh that whenever the sawtooth wave exceeds the control voltage U K an output U T is obtained from the comparator. The output pulses U T are also applied to a stabilizer 24, the output of which is fed via resistor 21, together with the control voltage U st to the input of an integrator comprising amplifier 18 with feedback over capacitor 19; the output from amplifier 18 comprises the control voltage U k .
GB5423870A 1969-11-15 1970-11-13 Amplifier circuits Expired GB1337005A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691957592 DE1957592A1 (en) 1969-11-15 1969-11-15 Operational amplifier with changeable RC network

Publications (1)

Publication Number Publication Date
GB1337005A true GB1337005A (en) 1973-11-14

Family

ID=5751253

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5423870A Expired GB1337005A (en) 1969-11-15 1970-11-13 Amplifier circuits

Country Status (4)

Country Link
JP (1) JPS4936767B1 (en)
DE (1) DE1957592A1 (en)
FR (1) FR2071680A5 (en)
GB (1) GB1337005A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201559A (en) * 1987-01-23 1988-09-01 Gen Electric Plc Electrical signal mixer circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4577097A (en) * 1982-09-03 1986-03-18 The Babcock & Wilcox Company Three-mode analog controller with remote tuning

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201559A (en) * 1987-01-23 1988-09-01 Gen Electric Plc Electrical signal mixer circuit

Also Published As

Publication number Publication date
DE1957592A1 (en) 1971-05-27
FR2071680A5 (en) 1971-09-17
JPS4936767B1 (en) 1974-10-03

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees