JPS6436209A - Variable impedance circuit - Google Patents
Variable impedance circuitInfo
- Publication number
- JPS6436209A JPS6436209A JP19159987A JP19159987A JPS6436209A JP S6436209 A JPS6436209 A JP S6436209A JP 19159987 A JP19159987 A JP 19159987A JP 19159987 A JP19159987 A JP 19159987A JP S6436209 A JPS6436209 A JP S6436209A
- Authority
- JP
- Japan
- Prior art keywords
- current
- input terminal
- path
- current flowing
- 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.)
- Granted
Links
Landscapes
- Networks Using Active Elements (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To improve the linearity by representing an input voltage given to a differential input terminal by a product between a resistance of a path comprising 1st-4th transistors(TR) and the impedance element and a current flowing to the path thereby canceling the total sum of the voltage component caused in the internal resistance of each TR. CONSTITUTION:TRs Q15, Q16 form a current mirror circuit 14, the collector of the TR Q16 is an input and the collector of the TR Q15 is an output section and the emitters of the TRs Q15, Q16 are connected to a 1st power supply (Vcc). Then the output of the current mirror circuit 14 and the input terminal 1 are connected to form a feedback path. Through the constitution above, in varying the ratio of the current flowing to current sources Ic11, Ic12 (identical) to the current flowing to the current source Ic2, the impedance viewed from the input terminal 1 is made variable. Thus, the effect of the TR due to its internal resistor is not given and the linearity of the voltage-current conversion section is improved and the resistor R21 is selected optionally by not taking the internal resistor into account.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19159987A JPH0652855B2 (en) | 1987-07-31 | 1987-07-31 | Variable impedance circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19159987A JPH0652855B2 (en) | 1987-07-31 | 1987-07-31 | Variable impedance circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6436209A true JPS6436209A (en) | 1989-02-07 |
JPH0652855B2 JPH0652855B2 (en) | 1994-07-06 |
Family
ID=16277319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19159987A Expired - Lifetime JPH0652855B2 (en) | 1987-07-31 | 1987-07-31 | Variable impedance circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0652855B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110166008A (en) * | 2019-05-22 | 2019-08-23 | 澋芯微电子(重庆)有限公司 | A kind of adaptive bipolar amplifier with linear bias circuit |
-
1987
- 1987-07-31 JP JP19159987A patent/JPH0652855B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110166008A (en) * | 2019-05-22 | 2019-08-23 | 澋芯微电子(重庆)有限公司 | A kind of adaptive bipolar amplifier with linear bias circuit |
Also Published As
Publication number | Publication date |
---|---|
JPH0652855B2 (en) | 1994-07-06 |
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