JPS6458104A - Frequency modulator - Google Patents

Frequency modulator

Info

Publication number
JPS6458104A
JPS6458104A JP62214327A JP21432787A JPS6458104A JP S6458104 A JPS6458104 A JP S6458104A JP 62214327 A JP62214327 A JP 62214327A JP 21432787 A JP21432787 A JP 21432787A JP S6458104 A JPS6458104 A JP S6458104A
Authority
JP
Japan
Prior art keywords
current
modulation signal
circuit
multivibrator
charge
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
JP62214327A
Other languages
Japanese (ja)
Other versions
JP2937316B2 (en
Inventor
Takeshi Yamamoto
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP62214327A priority Critical patent/JP2937316B2/en
Publication of JPS6458104A publication Critical patent/JPS6458104A/en
Application granted granted Critical
Publication of JP2937316B2 publication Critical patent/JP2937316B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE:To reduce the adjusting time and to save number of components by using a variable transconductance circuit of gain cell constitution and using a current obtained through the input of a modulation signal and a fixed current proportional to the transconductance as a charge/discharge current of a multivibrator. CONSTITUTION:In deciding a modulation signal as control currents IC1, IC2 as shown in figure in a voltage current conversion circuit 30 converting the modulation signal into the control current, the sum of the control currents is an output current of the circuit 30. The current IC1 is a fixed current and adjusted by a variable resistor VR3. The modulation signal inputted between terminals 21, 22 is subjected to current conversion by a resistor R13, amplified differentially by transistors(TR) Q14, Q15, the current is converted in a way that the absolute value is proportional to the current IC1 by the Gilvert system gain cell configuration comprising TRs Q16-Q19. The current IC2 converted in this way is added to the current IC1 to become a charge/discharge current of the multivibrator 20.
JP62214327A 1987-08-28 1987-08-28 FM modulator Expired - Lifetime JP2937316B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62214327A JP2937316B2 (en) 1987-08-28 1987-08-28 FM modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62214327A JP2937316B2 (en) 1987-08-28 1987-08-28 FM modulator

Publications (2)

Publication Number Publication Date
JPS6458104A true JPS6458104A (en) 1989-03-06
JP2937316B2 JP2937316B2 (en) 1999-08-23

Family

ID=16653916

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62214327A Expired - Lifetime JP2937316B2 (en) 1987-08-28 1987-08-28 FM modulator

Country Status (1)

Country Link
JP (1) JP2937316B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032393A1 (en) * 1996-02-28 1997-09-04 Qualcomm Incorporated High dynamic range variable gain amplifier
WO1998033272A1 (en) * 1997-01-27 1998-07-30 Qualcomm Incorporated High dynamic range variable gain amplifier
US6882185B1 (en) 1998-07-02 2005-04-19 Qualcomm, Incorporated Exponential current generator and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158515U (en) * 1982-04-16 1983-10-22 株式会社日立製作所 frequency modulator
JPS6240806A (en) * 1985-08-19 1987-02-21 Fujitsu Ltd Frequency modulation circuit
JPS6253005A (en) * 1985-09-02 1987-03-07 Hitachi Micro Comput Eng Ltd Voltage controlled oscillator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158515U (en) * 1982-04-16 1983-10-22 株式会社日立製作所 frequency modulator
JPS6240806A (en) * 1985-08-19 1987-02-21 Fujitsu Ltd Frequency modulation circuit
JPS6253005A (en) * 1985-09-02 1987-03-07 Hitachi Micro Comput Eng Ltd Voltage controlled oscillator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032393A1 (en) * 1996-02-28 1997-09-04 Qualcomm Incorporated High dynamic range variable gain amplifier
WO1998033272A1 (en) * 1997-01-27 1998-07-30 Qualcomm Incorporated High dynamic range variable gain amplifier
US6882185B1 (en) 1998-07-02 2005-04-19 Qualcomm, Incorporated Exponential current generator and method

Also Published As

Publication number Publication date
JP2937316B2 (en) 1999-08-23

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