JPS57201314A - Variable attenuator - Google Patents
Variable attenuatorInfo
- Publication number
- JPS57201314A JPS57201314A JP8617181A JP8617181A JPS57201314A JP S57201314 A JPS57201314 A JP S57201314A JP 8617181 A JP8617181 A JP 8617181A JP 8617181 A JP8617181 A JP 8617181A JP S57201314 A JPS57201314 A JP S57201314A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- current
- working resistance
- instantaneous
- bias current
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/24—Frequency- independent attenuators
- H03H7/25—Frequency- independent attenuators comprising an element controlled by an electric or magnetic variable
Landscapes
- Attenuators (AREA)
Abstract
PURPOSE:To reduce the distortion rate and simplify the circuit, by making it so arranged that two diodes having inverse polarity against each other are connected in series under condition of AC and the signal electric current compensates the bias electric current of the diodes, namely influences of the bias current which are given to the working resistance. CONSTITUTION:A signal inputted from a terminal A is attenuated by an amount which is equal to the working resistance of diodes (D) 1 and 2, and outputted from another terminal B. At this time, the working resistance of the Ds 1 and 2 at the time of small signal is decided by the bias current of the Ds which flows depending on the DC voltage impressed upon a terminal C. However, at the time of large signal, the bias current of the Ds is varied by the instantaneous signal current and instantaneous working resistances of each D1 and 2 are also varied. However, since the Ds 1 and 2 are arranged so that their polarity may be inverse against each other against the signal path, the instantaneous signal current will decrease the bias current of the D2 when the current increases the bias current of the D1. Therefore, the instantaneous working resistance will be decreased at the D1 and increased at the D2, and thus, the sum of the working resistance at both Ds 1 and 2 is compensated to become constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8617181A JPS57201314A (en) | 1981-06-03 | 1981-06-03 | Variable attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8617181A JPS57201314A (en) | 1981-06-03 | 1981-06-03 | Variable attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57201314A true JPS57201314A (en) | 1982-12-09 |
Family
ID=13879303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8617181A Pending JPS57201314A (en) | 1981-06-03 | 1981-06-03 | Variable attenuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57201314A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59215111A (en) * | 1983-05-16 | 1984-12-05 | インタ−ナシヨナル ビジネス マシ−ンズ コ−ポレ−シヨン | Tunable filter |
-
1981
- 1981-06-03 JP JP8617181A patent/JPS57201314A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59215111A (en) * | 1983-05-16 | 1984-12-05 | インタ−ナシヨナル ビジネス マシ−ンズ コ−ポレ−シヨン | Tunable filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2576026A (en) | Electronic switch | |
| JPS56160112A (en) | Biasing circuit of electric power amplifier | |
| EP0233786A3 (en) | Circuit for providing a controlled resistance | |
| JPS5785110A (en) | Dc stabilized power supply circuit | |
| JPS5674776A (en) | Absolute-value circuit | |
| IE810289L (en) | Telephone line feed | |
| JPS568956A (en) | Three-terminal electric power source circuit for telephone set | |
| JPS57201314A (en) | Variable attenuator | |
| JPS56166612A (en) | Level shifting circuit | |
| JPS5744314A (en) | Variable attenuator | |
| PL105772B1 (en) | FUNCTION GENERATOR | |
| JPS5674894A (en) | Sense amplifier | |
| FR2369740A1 (en) | Current surge eliminating device - has circuit with several branches, one of which connects input to output and other circuits connect output to reference potential | |
| US3287651A (en) | Electric metering circuit | |
| JPS5482157A (en) | Electronic switch circuit | |
| JPS575406A (en) | Current limiting circuit | |
| JPS5719673A (en) | Electric current detector with resistance change-over circuit | |
| SE9604102L (en) | Method and apparatus for adjusting a first circuit to at least a second circuit according to DC | |
| JPS5789318A (en) | Variable gain amplifier | |
| SU1140050A1 (en) | Resistance comparator | |
| JPS57136813A (en) | Resistance branching circuit | |
| ES8506414A1 (en) | Threshold fail-safe logic circuit | |
| EP0118727A3 (en) | Amplitude adjusting equipment in a signal translation line | |
| JPS5737965A (en) | Two-terminal circuit | |
| JPS5739198A (en) | Plating apparatus |