Voltage controlled oscillator with frequency stabilized and PLL circuit using the same
First Claim
1. A voltage controlled oscillator comprising:
- N (N is an integer equal to or more than
2) inversion-type differential amplifiers connected in a loop such that each of output signals outputted from one of said N inversion-type differential amplifiers has an opposite polarity to a corresponding one of output signals outputted from the next one of said N inversion-type differential amplifiers; and
a level converter connected to one of said N inversion-type differential amplifiers as a last inversion-type differential amplifier to generate an oscillation signal from the output signals outputted from said last inversion-type differential amplifier, and wherein each of said N inversion-type differential amplifiers operates in response to a predetermined voltage and a control voltage.
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Abstract
A voltage controlled oscillator includes N (N is an integer equal to or more than 2) inversion-type differential amplifiers and a level converter. The N (N is an integer equal to or more than 2) inversion-type differential amplifiers are connected in a loop such that each of output signals outputted from one of the N inversion-type differential amplifiers has an opposite polarity to a corresponding one of output signals outputted from the next one of the N inversion-type differential amplifiers. The level converter is connected to one of the N inversion-type differential amplifiers as a last inversion-type differential amplifier to generate an oscillation signal from the output signals outputted from the last inversion-type differential amplifier. Each of the N inversion-type differential amplifiers operates in response to a predetermined voltage and a control voltage.
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Citations
30 Claims
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1. A voltage controlled oscillator comprising:
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N (N is an integer equal to or more than
2) inversion-type differential amplifiers connected in a loop such that each of output signals outputted from one of said N inversion-type differential amplifiers has an opposite polarity to a corresponding one of output signals outputted from the next one of said N inversion-type differential amplifiers; and
a level converter connected to one of said N inversion-type differential amplifiers as a last inversion-type differential amplifier to generate an oscillation signal from the output signals outputted from said last inversion-type differential amplifier, and wherein each of said N inversion-type differential amplifiers operates in response to a predetermined voltage and a control voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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17. A voltage controlled oscillator for generating an oscillation signal, comprising:
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offset means for determining an offset frequency based on a predetermined voltage; and
proportion means for controlling a frequency of said oscillation signal to be proportional to a predetermined voltage, and wherein the frequency of said oscillation signal is directly determined based on the predetermined voltage and the control voltage.
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18. A phase locked loop (PLL) circuit comprising:
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a phase frequency comparator which compares a reference signal and a feedback signal and generate a difference signal based on the comparison result;
a control voltage generating section which generates a control voltage in response to said difference signal;
a voltage controlled oscillator which generates an oscillation signal based on said control voltage and a predetermined voltage; and
a frequency divider which carries out a frequency division to said oscillation signal outputted from said voltage controlled oscillator to produce said feedback signal.
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Specification