JPS54136158A - Gain control amplifier - Google Patents
Gain control amplifierInfo
- Publication number
- JPS54136158A JPS54136158A JP4270078A JP4270078A JPS54136158A JP S54136158 A JPS54136158 A JP S54136158A JP 4270078 A JP4270078 A JP 4270078A JP 4270078 A JP4270078 A JP 4270078A JP S54136158 A JPS54136158 A JP S54136158A
- Authority
- JP
- Japan
- Prior art keywords
- collector current
- gain control
- amplifier
- base voltage
- sum
- 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.)
- Granted
Links
- 230000006866 deterioration Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To prevent the deterioration of the cross modulation properties and others by avoiding a big change of the bias conditions for the differential amplifier of the next step when the gain control is given. CONSTITUTION:The collector voltage of transistor Tr11, i.e., the base voltage of differential amplifier 21 of the next step is decided by the sum of the collector current of Tr11 and 13 plus the value of load resistance 15. Thus, the base voltage of amplifier 21 can be kept constant as long as the sum of the collector current is constant. Now if the potential at point A is lowered and the collector current flowing to Tr11 is reduced, the collector current of Tr12 is reduced simultaneously. As a result, the base voltage of Tr13 increases and also the collector current of Tr13 increases. And the sum of the collector current becomes nearly constant between Tr11 and 13. In case this relation is satisfied substantially, the base voltage of amplifier 21 can be kept nearly constant even with the gain control given via the gain control amplifier of the preceding step.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4270078A JPS54136158A (en) | 1978-04-13 | 1978-04-13 | Gain control amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4270078A JPS54136158A (en) | 1978-04-13 | 1978-04-13 | Gain control amplifier |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54136158A true JPS54136158A (en) | 1979-10-23 |
JPS626363B2 JPS626363B2 (en) | 1987-02-10 |
Family
ID=12643320
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4270078A Granted JPS54136158A (en) | 1978-04-13 | 1978-04-13 | Gain control amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54136158A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20160148600A (en) | 2014-05-14 | 2016-12-26 | 도쿄 라이트 고교 가부시키가이샤 | Cap |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA3139970A1 (en) | 2019-05-13 | 2020-11-19 | U.S. Well Services, LLC | Encoderless vector control for vfd in hydraulic fracturing applications |
US11542786B2 (en) | 2019-08-01 | 2023-01-03 | U.S. Well Services, LLC | High capacity power storage system for electric hydraulic fracturing |
-
1978
- 1978-04-13 JP JP4270078A patent/JPS54136158A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20160148600A (en) | 2014-05-14 | 2016-12-26 | 도쿄 라이트 고교 가부시키가이샤 | Cap |
KR20180125631A (en) | 2014-05-14 | 2018-11-23 | 도쿄 라이트 고교 가부시키가이샤 | Cap |
Also Published As
Publication number | Publication date |
---|---|
JPS626363B2 (en) | 1987-02-10 |
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