JPS6449413A - Bridging t-type variable resistance attenuator - Google Patents
Bridging t-type variable resistance attenuatorInfo
- Publication number
- JPS6449413A JPS6449413A JP20517687A JP20517687A JPS6449413A JP S6449413 A JPS6449413 A JP S6449413A JP 20517687 A JP20517687 A JP 20517687A JP 20517687 A JP20517687 A JP 20517687A JP S6449413 A JPS6449413 A JP S6449413A
- Authority
- JP
- Japan
- Prior art keywords
- pin diode
- impedance
- attenuator
- bridging
- input
- 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
- Attenuators (AREA)
Abstract
PURPOSE:To miniaturize the titled attenuator, by constituting a variable resistor inserted in series with an input/output terminal of a PIN diode, and the variable resistor inserted in parallel with a line of the PIN diode and a 1/4-wave impedance inversion line. CONSTITUTION:An impedance observing the PIN diode 12 from the connection point of resistors 5 and 6 is inversely proportional to the impedance between the terminals of the PIN diode 10, and a device is operated ideally as a bridging T-type resistance attenuator, and no reflecting wave is generated at the input/ output terminal. In such a way, it is possible to vary a attenuating quantity successively as keeping the impedance of input/output constant by supplying a DC bias current from a bias supplying terminal 9 as controlling it in the bridging T-type resistance attenuator. In the circuit, the attenuating quantity is decreased by increasing a DC current. Therefore, in the circuit, it is enough to prepare one 1/4-wave line whose geometric size is limited, and it is possible to miniaturize the circuit compared with an ongoing attenuator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20517687A JPS6449413A (en) | 1987-08-20 | 1987-08-20 | Bridging t-type variable resistance attenuator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20517687A JPS6449413A (en) | 1987-08-20 | 1987-08-20 | Bridging t-type variable resistance attenuator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6449413A true JPS6449413A (en) | 1989-02-23 |
Family
ID=16502681
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20517687A Pending JPS6449413A (en) | 1987-08-20 | 1987-08-20 | Bridging t-type variable resistance attenuator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6449413A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5808520A (en) * | 1995-03-22 | 1998-09-15 | Nec Corporation | Attenuating circuit using quarter-wave lines |
-
1987
- 1987-08-20 JP JP20517687A patent/JPS6449413A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5808520A (en) * | 1995-03-22 | 1998-09-15 | Nec Corporation | Attenuating circuit using quarter-wave lines |
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