JPS6418304A - Preamplifier - Google Patents
PreamplifierInfo
- Publication number
- JPS6418304A JPS6418304A JP17557287A JP17557287A JPS6418304A JP S6418304 A JPS6418304 A JP S6418304A JP 17557287 A JP17557287 A JP 17557287A JP 17557287 A JP17557287 A JP 17557287A JP S6418304 A JPS6418304 A JP S6418304A
- Authority
- JP
- Japan
- Prior art keywords
- level
- output
- input signal
- current
- fed
- 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
Abstract
PURPOSE:To make the amplification operation stable over a wide level range against the change in an optical input signal level by giving an output of an amplifier receiving an output of a light receiving element as an input signal to the input of amplifier via a nonlinear feedback circuit. CONSTITUTION:A common emitter transistor (TR) 121 constitutes the input of the amplifier, to which an output of the light receiving element 11 is fed as an input signal and an output voltage of a TR 122 is fed to the input via a nonlinear feedback circuit 13. As the light receiving level is increased, the signal current fed from the element 11 to the TR 121 is increased and then a potential across the resistor 131 of the circuit 131 is increased. Thus, a current is branched to a diode 132 through the conduction of the diode 132, and the state is the same effect as increasing the feedback quantity, the current-voltage conversion gain is reduced and even when the signal current is large, the amplification is made stable without saturating the TRs. Thus, the amplification stable for a wide range of level is attained against the change in the optical input signal level.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17557287A JPS6418304A (en) | 1987-07-14 | 1987-07-14 | Preamplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17557287A JPS6418304A (en) | 1987-07-14 | 1987-07-14 | Preamplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6418304A true JPS6418304A (en) | 1989-01-23 |
Family
ID=15998426
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17557287A Pending JPS6418304A (en) | 1987-07-14 | 1987-07-14 | Preamplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6418304A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0360208A (en) * | 1989-07-28 | 1991-03-15 | Hitachi Ltd | Optical pre-amplifier |
US5646573A (en) * | 1995-02-28 | 1997-07-08 | Anadigics, Inc. | Automatic gain-control transimpedence amplifier |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5970328A (en) * | 1982-10-15 | 1984-04-20 | Matsushita Electric Works Ltd | Amplifier circuit of received light |
JPS6141213A (en) * | 1984-08-01 | 1986-02-27 | Sumitomo Electric Ind Ltd | Current-to-voltage conversion part of light receiving circuit |
-
1987
- 1987-07-14 JP JP17557287A patent/JPS6418304A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5970328A (en) * | 1982-10-15 | 1984-04-20 | Matsushita Electric Works Ltd | Amplifier circuit of received light |
JPS6141213A (en) * | 1984-08-01 | 1986-02-27 | Sumitomo Electric Ind Ltd | Current-to-voltage conversion part of light receiving circuit |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0360208A (en) * | 1989-07-28 | 1991-03-15 | Hitachi Ltd | Optical pre-amplifier |
US5646573A (en) * | 1995-02-28 | 1997-07-08 | Anadigics, Inc. | Automatic gain-control transimpedence amplifier |
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