JPS5460851A - Amplitude modulator - Google Patents
Amplitude modulatorInfo
- Publication number
- JPS5460851A JPS5460851A JP12802777A JP12802777A JPS5460851A JP S5460851 A JPS5460851 A JP S5460851A JP 12802777 A JP12802777 A JP 12802777A JP 12802777 A JP12802777 A JP 12802777A JP S5460851 A JPS5460851 A JP S5460851A
- Authority
- JP
- Japan
- Prior art keywords
- current
- temperature
- modulation
- bias
- output
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
Abstract
PURPOSE:To avoid the fluctuation of the modulation degree caused by the temperature by adding the bias circuit featuring the temperature characteristics to the amplitude modulator and then controlling the output change of the oscillator due to the temperature change via the increase and decrease of the bias current. CONSTITUTION:The output of oscillator 1' is applied to modulation diode 2', and the bias current applied to diode 2' is changed over by switch 3. This switching is carried out in correspondence to the value which is decided by the voltage and current connected to bias terminal 5' and 6' according to the modulation signal input 4. In this way, however, the modulation fluctuation due to the temperature is produced at the output emerging at output terminal 8' of circulator 7'. In this connection, the bias circuit consisting of current source 9 which does not change by the temperature and current source 10 which changes by the temperature is added previously to bias terminal 5'. As a result, the current flowing to diode 2' is set to difference current I1-I2 between two current sources 9 and 10 in order to keep the degree of modulation constant.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12802777A JPS604626B2 (en) | 1977-10-24 | 1977-10-24 | amplitude modulator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12802777A JPS604626B2 (en) | 1977-10-24 | 1977-10-24 | amplitude modulator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5460851A true JPS5460851A (en) | 1979-05-16 |
JPS604626B2 JPS604626B2 (en) | 1985-02-05 |
Family
ID=14974677
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12802777A Expired JPS604626B2 (en) | 1977-10-24 | 1977-10-24 | amplitude modulator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS604626B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6272340U (en) * | 1985-10-18 | 1987-05-09 | ||
JPH0372944U (en) * | 1989-11-20 | 1991-07-23 |
-
1977
- 1977-10-24 JP JP12802777A patent/JPS604626B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS604626B2 (en) | 1985-02-05 |
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