FREQUENCY SYNTHESIZER
PROBLEM TO BE SOLVED: To make an S/N high and to make a separating shield and an amplifier simple and inexpensive. SOLUTION: A variable frequency divider 12 undergoes frequency dividing of an output of a VCO 31; a frequency converter 33 converts the output into a low frequency with an output of a di...
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| creator | OSAWA KATSURO WAKAMOTO SATORU |
| description | PROBLEM TO BE SOLVED: To make an S/N high and to make a separating shield and an amplifier simple and inexpensive. SOLUTION: A variable frequency divider 12 undergoes frequency dividing of an output of a VCO 31; a frequency converter 33 converts the output into a low frequency with an output of a direct digital synthesizer 32; a comparator 13 performs phase comparison of the frequency conversion output with a reference signal of a reference oscillator 14; and the comparison output is supplied to the VCO 31 through a loop filter 15 to control the VCO 31. For instance, 30 to 100MHz signal outputs an oscillation output of the VCO 31 to an output terminal 24 through a switch 34, and 100kHz to 30MHz signal outputs from the DDS 32 to the terminal 24. |
| format | Patent |
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SOLUTION: A variable frequency divider 12 undergoes frequency dividing of an output of a VCO 31; a frequency converter 33 converts the output into a low frequency with an output of a direct digital synthesizer 32; a comparator 13 performs phase comparison of the frequency conversion output with a reference signal of a reference oscillator 14; and the comparison output is supplied to the VCO 31 through a loop filter 15 to control the VCO 31. 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| language | eng |
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| subjects | AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY ELECTRICITY GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER |
| title | FREQUENCY SYNTHESIZER |
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