GB1152702A - Improvements in or relating to D.C. Amplifiers. - Google Patents

Improvements in or relating to D.C. Amplifiers.

Info

Publication number
GB1152702A
GB1152702A GB2519565A GB2519565A GB1152702A GB 1152702 A GB1152702 A GB 1152702A GB 2519565 A GB2519565 A GB 2519565A GB 2519565 A GB2519565 A GB 2519565A GB 1152702 A GB1152702 A GB 1152702A
Authority
GB
United Kingdom
Prior art keywords
amplifier
output
feedback circuit
feedback
switching means
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
GB2519565A
Inventor
Graham Molyneux Stopford
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.)
Fielden Electronics Ltd
Original Assignee
Fielden Electronics 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 Fielden Electronics Ltd filed Critical Fielden Electronics Ltd
Priority to GB2519565A priority Critical patent/GB1152702A/en
Priority to DE19661487292 priority patent/DE1487292A1/en
Publication of GB1152702A publication Critical patent/GB1152702A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/303—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

1,152,702. D.C. amplifiers. FIELDEN ELECTRONICS Ltd. 27 May, 1966 [15 June, 1965], No. 25195/65. Heading H3T. In a D.C. amplifier having a differential amplifier 21, 22; 32, 33, a first switching means 40 periodically shorts the input 28, 29 of the amplifier to zero for a minor part of the switching period and a second switching means 41 operating simultaneously with the first switching means connects the output of the amplifier to a feedback circuit 42-44 which operates to reduce the output substantially to zero when the input is shorted, and the feedback circuit includes a storage means 43, which maintains this level of feedback during the intervals when the feedback circuit is disconnected from the output. The feedback circuit stabilizes the amplifier against drift by having a short time constant R-C network 42, 43 which charges from the output of the amplifier when switch 41 is closed, the capacitor 43 and resistor 44 providing a long time constant circuit so that the feedback is maintained constant when the switch 41 is opened. In an alternative amplifier (Fig. 1, not shown), the feedback circuit includes a differential amplifier (9) which controls a heater element (5) associated with a temperature-sensitive resistor (4) connected so as to provide the above control of the output.
GB2519565A 1965-06-15 1965-06-15 Improvements in or relating to D.C. Amplifiers. Expired GB1152702A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2519565A GB1152702A (en) 1965-06-15 1965-06-15 Improvements in or relating to D.C. Amplifiers.
DE19661487292 DE1487292A1 (en) 1965-06-15 1966-06-07 DC amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2519565A GB1152702A (en) 1965-06-15 1965-06-15 Improvements in or relating to D.C. Amplifiers.

Publications (1)

Publication Number Publication Date
GB1152702A true GB1152702A (en) 1969-05-21

Family

ID=10223773

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2519565A Expired GB1152702A (en) 1965-06-15 1965-06-15 Improvements in or relating to D.C. Amplifiers.

Country Status (2)

Country Link
DE (1) DE1487292A1 (en)
GB (1) GB1152702A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003021772A1 (en) * 2001-09-04 2003-03-13 Analog Devices, Inc. Ping-pong amplifier with auto-zeroing and chopping
CN1575544B (en) * 2001-09-04 2011-09-28 美国亚德诺半导体公司 Auto-zeroed ping-pong amplifier with low transient switching

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003021772A1 (en) * 2001-09-04 2003-03-13 Analog Devices, Inc. Ping-pong amplifier with auto-zeroing and chopping
CN1582528B (en) * 2001-09-04 2011-09-28 美国亚德诺半导体公司 Ping-pong amplifier with auto-zeroing and chopping
CN1575544B (en) * 2001-09-04 2011-09-28 美国亚德诺半导体公司 Auto-zeroed ping-pong amplifier with low transient switching

Also Published As

Publication number Publication date
DE1487292A1 (en) 1969-03-06

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Legal Events

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