JPS5460851A - Amplitude modulator - Google Patents

Amplitude modulator

Info

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
Application number
JP12802777A
Other languages
Japanese (ja)
Other versions
JPS604626B2 (en
Inventor
Yoshihiko Akaiwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12802777A priority Critical patent/JPS604626B2/en
Publication of JPS5460851A publication Critical patent/JPS5460851A/en
Publication of JPS604626B2 publication Critical patent/JPS604626B2/en
Expired legal-status Critical Current

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.
JP12802777A 1977-10-24 1977-10-24 amplitude modulator Expired JPS604626B2 (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6272340U (en) * 1985-10-18 1987-05-09
JPH0372944U (en) * 1989-11-20 1991-07-23

Also Published As

Publication number Publication date
JPS604626B2 (en) 1985-02-05

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