JPS574602A - Wide-band fm modulator - Google Patents

Wide-band fm modulator

Info

Publication number
JPS574602A
JPS574602A JP7783680A JP7783680A JPS574602A JP S574602 A JPS574602 A JP S574602A JP 7783680 A JP7783680 A JP 7783680A JP 7783680 A JP7783680 A JP 7783680A JP S574602 A JPS574602 A JP S574602A
Authority
JP
Japan
Prior art keywords
filter
propagation
phase
delay time
modulation frequency
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
JP7783680A
Other languages
Japanese (ja)
Other versions
JPS6358402B2 (en
Inventor
Hiroshi Suzuki
Koji Monma
Shuji Urabe
Shigeo Takahashi
Yukio Naito
Takao Morita
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.)
Toyo Communication Equipment Co Ltd
NTT Inc
Original Assignee
Toyo Communication Equipment Co Ltd
Nippon Telegraph and Telephone 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 Toyo Communication Equipment Co Ltd, Nippon Telegraph and Telephone Corp filed Critical Toyo Communication Equipment Co Ltd
Priority to JP7783680A priority Critical patent/JPS574602A/en
Publication of JPS574602A publication Critical patent/JPS574602A/en
Publication of JPS6358402B2 publication Critical patent/JPS6358402B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)

Abstract

PURPOSE:To improve the modulation frequency characteristics and relaize a wide band, by setting the reciprocal value of the delay time of propagation of an elastic surface wave filter used for a delay element at a double value or more of the maximum modulation frequency. CONSTITUTION:Action of oscillation is carried out by a positive feedback loop comprising an amplifier 31, a variable phase shifter 32 and a band pass filter 33, and the phase condition is varied by the shifter 32 to control the frequency of oscillation. In this case, the degree of inclination, i.e., the delay time of propagation is decided for the filter 32 so that the phase characteristics of the filter is set at pi radian or a lower change of phase with the frequency axis that is decided by the maximum modulation frequency Fmax. As a result, the delay time of propagation of the filter 33 can be set at 1/2.Fmax or less.
JP7783680A 1980-06-11 1980-06-11 Wide-band fm modulator Granted JPS574602A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7783680A JPS574602A (en) 1980-06-11 1980-06-11 Wide-band fm modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7783680A JPS574602A (en) 1980-06-11 1980-06-11 Wide-band fm modulator

Publications (2)

Publication Number Publication Date
JPS574602A true JPS574602A (en) 1982-01-11
JPS6358402B2 JPS6358402B2 (en) 1988-11-15

Family

ID=13645120

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7783680A Granted JPS574602A (en) 1980-06-11 1980-06-11 Wide-band fm modulator

Country Status (1)

Country Link
JP (1) JPS574602A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4975248A (en) * 1972-10-30 1974-07-19

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4975248A (en) * 1972-10-30 1974-07-19

Also Published As

Publication number Publication date
JPS6358402B2 (en) 1988-11-15

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