GB1148368A - Chopper stabilized operational amplifier - Google Patents
Chopper stabilized operational amplifierInfo
- Publication number
- GB1148368A GB1148368A GB3300467A GB3300467A GB1148368A GB 1148368 A GB1148368 A GB 1148368A GB 3300467 A GB3300467 A GB 3300467A GB 3300467 A GB3300467 A GB 3300467A GB 1148368 A GB1148368 A GB 1148368A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- chopper
- capacitor
- input
- resistor
- 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
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
1,148,368. Amplifiers. ZELTEX Inc. 18 July, 1967 [1 Sept., 1966], No. 33004/67. Heading H3W. In an operational amplifier of the type in which the D.C. working conditions are stabilized by means of a subsidiary chopper-type amplifier, feedback is provided around the chopper amplifier which is not operative for normal linear operation of the system, but comes into operation upon overload. An embodiment comprises amplifier system 11 provided with series input resistor R in and overall negative feedback via resistor R feedb to summing junction 27. Amplifier system 11 comprises series resistor R 1 connected to junction 21, from which A.C. components are fed over capacitor 38 to input 51 of input stage 36. The D.C. components are filtered off by RC network 32, 29 and applied to a chopper-type amplifier comprising input resistor 33 and chopper 31 feeding via capacitor 25 an A.C. amplifier 23. The output of amplifier 23 passes via capacitor 20 to output chopper 34, the output of which is smoothed by resistor R f and capacitor C f and applied to the second input 52 of input stage 36. Input stage 36 feeds output stage 22. In such an arrangement, momentary overload causes capacitor C f to be charged up and this blocks the operation of the amplifier for an appreciable time-interval before the capacitor becomes discharged again. To prevent such overloading occurring negative feedback is applied around the amplifiers 23, 36 by means of a feedback path to junction 21, comprising an auxiliary amplifier 14 which may be of unity gain, and reversely connected diodes 17, 18 which provide that feedback only occurs when normal signal levels are exceeded.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57668966A | 1966-09-01 | 1966-09-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1148368A true GB1148368A (en) | 1969-04-10 |
Family
ID=24305551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3300467A Expired GB1148368A (en) | 1966-09-01 | 1967-07-18 | Chopper stabilized operational amplifier |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1148368A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117254816A (en) * | 2023-11-17 | 2023-12-19 | 杭州万高科技股份有限公司 | Low-noise analog-to-digital conversion interface circuit |
-
1967
- 1967-07-18 GB GB3300467A patent/GB1148368A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117254816A (en) * | 2023-11-17 | 2023-12-19 | 杭州万高科技股份有限公司 | Low-noise analog-to-digital conversion interface circuit |
| CN117254816B (en) * | 2023-11-17 | 2024-01-26 | 杭州万高科技股份有限公司 | Low-noise analog-to-digital conversion interface circuit |
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