GB1174903A - Improvements in or relating to Constant Current Generators. - Google Patents

Improvements in or relating to Constant Current Generators.

Info

Publication number
GB1174903A
GB1174903A GB2040266A GB2040266A GB1174903A GB 1174903 A GB1174903 A GB 1174903A GB 2040266 A GB2040266 A GB 2040266A GB 2040266 A GB2040266 A GB 2040266A GB 1174903 A GB1174903 A GB 1174903A
Authority
GB
United Kingdom
Prior art keywords
collector
circuit
resistor
resistors
constant current
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
GB2040266A
Inventor
Michael Vaughan Cadwallader
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.)
Marconi Instruments Ltd
Original Assignee
Marconi Instruments Ltd
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 Marconi Instruments Ltd filed Critical Marconi Instruments Ltd
Priority to GB2040266A priority Critical patent/GB1174903A/en
Publication of GB1174903A publication Critical patent/GB1174903A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc
    • G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/22—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the bipolar type only
    • G05F3/222—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the bipolar type only with compensation for device parameters, e.g. Early effect, gain, manufacturing process, or external variations, e.g. temperature, loading, supply voltage
    • G05F3/225—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the bipolar type only with compensation for device parameters, e.g. Early effect, gain, manufacturing process, or external variations, e.g. temperature, loading, supply voltage producing a current or voltage as a predetermined function of the temperature

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

1,174,903. Sawtooth generators. MARCONI INSTRUMENTS Ltd. 2 Feb., 1967 [9 May, 1966], No. 20402/66. Heading H3T. [Also in Division G3] A constant current arrangement comprises transistors T1, T2, of the same conductivity type with similar temperature dependent characteristics, T1 having respective equal resistors 3, 4 in its emitter and collector circuits and its base connected to the junction between resistors 1, 2 which are in series across a D.C. supply E, -V, and T2 having a resistor 5 in its emitter circuit, its base connected to the collector of T1 and, in its collector circuit, terminals L for the connection of a load to be supplied with constant current; the value of resistor 5 is equal to the product of the values of resistors 1 and 2 divided by the sum of said values. Resistor 1 may be replaced by a temperature compensated Zener diode. The input resistance of the arrangement may be reduced by providing a feed-back circuit between the collector of T2 and the base of T1, and by providing means ensuring a predetermined fixed component of current-flow through the circuit of transistor T2 (Figs. 3 and 4, not shown). The transistors T1, T2 preferably have a common housing, and the arrangement may be used in connection with linear voltage ramp generators and voltage controlled delay circuits.
GB2040266A 1966-05-09 1966-05-09 Improvements in or relating to Constant Current Generators. Expired GB1174903A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2040266A GB1174903A (en) 1966-05-09 1966-05-09 Improvements in or relating to Constant Current Generators.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2040266A GB1174903A (en) 1966-05-09 1966-05-09 Improvements in or relating to Constant Current Generators.

Publications (1)

Publication Number Publication Date
GB1174903A true GB1174903A (en) 1969-12-17

Family

ID=10145389

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2040266A Expired GB1174903A (en) 1966-05-09 1966-05-09 Improvements in or relating to Constant Current Generators.

Country Status (1)

Country Link
GB (1) GB1174903A (en)

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Legal Events

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