JPS5758404A - Amplifying circuit - Google Patents
Amplifying circuitInfo
- Publication number
- JPS5758404A JPS5758404A JP13359380A JP13359380A JPS5758404A JP S5758404 A JPS5758404 A JP S5758404A JP 13359380 A JP13359380 A JP 13359380A JP 13359380 A JP13359380 A JP 13359380A JP S5758404 A JPS5758404 A JP S5758404A
- Authority
- JP
- Japan
- Prior art keywords
- load
- amplifying stage
- input
- voltage amplifying
- inversely proportional
- 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.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
PURPOSE: To achieve stable amplification, by providing a phase compensating capacitive element between the input of the 1st voltage amplifying stage and th output of a voltage amplifying stage so that the pole frequency is inversely proportional to a load resistor.
CONSTITUTION: A phase compensating capacitor C is provided between the base input of a transistor Q5 being the input of the 1st voltage amplifying stage 2 and a circuit output vo. In case of no negative feedback, an opened loop gain at low region is gm1.Ro.hfe.gm2.RL and it is porportional to the load RL. On the other hand, the opened loop taking into consideration of high frequencies is expressed in equation (4). That is, the 1st pole frequency is 1/2πsCRL(1+gm1Rohfe) which is inversely proportional to the load RL. Thus, the characteristic with -6dB/OCT inclination are coincident independently of the value of the load RL, and a given band width can be obtained independently of the load with a closed loop gain of 1/β through feedback.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13359380A JPS5758404A (en) | 1980-09-25 | 1980-09-25 | Amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13359380A JPS5758404A (en) | 1980-09-25 | 1980-09-25 | Amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5758404A true JPS5758404A (en) | 1982-04-08 |
Family
ID=15108430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13359380A Pending JPS5758404A (en) | 1980-09-25 | 1980-09-25 | Amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5758404A (en) |
-
1980
- 1980-09-25 JP JP13359380A patent/JPS5758404A/en active Pending
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