Frequency synthesizing system for AM.multidot.SSB transceiver
First Claim
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1. A frequency synthesizing system for use in an AM·
- SSB transceiver of double conversion type comprising a PLL synthesizer, said system comprising;
a single crystal oscillator generating a fundamental frequency Xo of said PLL synthesizer given by the equation
space="preserve" listing-type="equation">X.sub.o =2×
M×
f.sub.2 IF where M is a positive integer, and f2 IF is a second intermediate frequency;
means for dividing the fundamental frequency Xo by the factor of M to provide a frequency f1 which is two times the second intermediate frequency f2 IF and given by the equation
space="preserve" listing-type="equation">f.sub.1 =(X.sub.o /M)=2×
f.sub.2 IF;
means for dividing the frequency f1 by the factor of 2 to provide said second intermediate frequency f2 IF given by the equation
space="preserve" listing-type="equation">f.sub.2 IF=(f.sub.1 /2);
means for mixing said fundamental frequency Xo and said frequency f1 to provide a frequency f2 which represents the sum of them or the difference therebetween and is given by the equation
space="preserve" listing-type="equation">f.sub.2 =X.sub.o +2×
f.sub.2 IF;
means for providing a first intermediate frequency f1 IF which represents the sum of said fundamental frequency Xo and said second intermediate frequency f2 IF or the difference therebetween and is given by the equation
space="preserve" listing-type="equation">f.sub.1 IF=X.sub.o ±
f.sub.2 IF;
means for dividing said second intermediate frequency f2 IF or said frequency f1 =2×
f2 IF to provide one of the two inputs to a phase comparator in said PLL synthesizer for energizing said PLL synthesizer; and
voltage controlled oscillator means for providing an output frequency fvco of said PLL synthesizer which frequency represents the sum of a transmitting and receiving frequency fT,R and said first intermediate frequency f1 IF or the difference therebetween and is given by the equation
space="preserve" listing-type="equation">f.sub.vco =f.sub.T,R ±
f.sub.1 IF whereby all the frequencies required for the operation of the AM·
SSB transceiver can be provided by the oscillation of the single crystal oscillator generating the fundamental frequency of said PLL synthesizer.
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Abstract
A frequency synthesizing system for use in an AM·SSB transceiver of double conversion type comprising a single crystal oscillator in its PLL synthesizer. The fundamental frequency of the PLL synthesizer provided by the oscillation of the crystal oscillator is selected to be n times (where n is an even number) the second intermediate frequency of the transceiver so that all the frequencies required for the operation of the AM·SSB transceiver can be derived from the oscillation frequency of the single crystal oscillator, whereby to simplify the structure of the AM·SSB transceiver and to facilitate the adjustment of the transceiver.
16 Citations
10 Claims
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1. A frequency synthesizing system for use in an AM·
- SSB transceiver of double conversion type comprising a PLL synthesizer, said system comprising;
a single crystal oscillator generating a fundamental frequency Xo of said PLL synthesizer given by the equation
space="preserve" listing-type="equation">X.sub.o =2×
M×
f.sub.2 IFwhere M is a positive integer, and f2 IF is a second intermediate frequency; means for dividing the fundamental frequency Xo by the factor of M to provide a frequency f1 which is two times the second intermediate frequency f2 IF and given by the equation
space="preserve" listing-type="equation">f.sub.1 =(X.sub.o /M)=2×
f.sub.2 IF;means for dividing the frequency f1 by the factor of 2 to provide said second intermediate frequency f2 IF given by the equation
space="preserve" listing-type="equation">f.sub.2 IF=(f.sub.1 /2);means for mixing said fundamental frequency Xo and said frequency f1 to provide a frequency f2 which represents the sum of them or the difference therebetween and is given by the equation
space="preserve" listing-type="equation">f.sub.2 =X.sub.o +2×
f.sub.2 IF;means for providing a first intermediate frequency f1 IF which represents the sum of said fundamental frequency Xo and said second intermediate frequency f2 IF or the difference therebetween and is given by the equation
space="preserve" listing-type="equation">f.sub.1 IF=X.sub.o ±
f.sub.2 IF;means for dividing said second intermediate frequency f2 IF or said frequency f1 =2×
f2 IF to provide one of the two inputs to a phase comparator in said PLL synthesizer for energizing said PLL synthesizer; andvoltage controlled oscillator means for providing an output frequency fvco of said PLL synthesizer which frequency represents the sum of a transmitting and receiving frequency fT,R and said first intermediate frequency f1 IF or the difference therebetween and is given by the equation
space="preserve" listing-type="equation">f.sub.vco =f.sub.T,R ±
f.sub.1 IFwhereby all the frequencies required for the operation of the AM·
SSB transceiver can be provided by the oscillation of the single crystal oscillator generating the fundamental frequency of said PLL synthesizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- SSB transceiver of double conversion type comprising a PLL synthesizer, said system comprising;
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsWatanabe, Masahiro, Haruki, Hiroshi
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Primary Examiner(s)Pitts, Harold T.
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Application NumberUS06/030,387Time in Patent Office645 DaysField of Search325/17, 325/20, 325/25, 325/184US Class Current455/76CPC Class CodesH03D 7/163 the local oscillations of a...H04B 1/405 with multiple discrete chan...
