Voltage controlled oscillator, frequency synthesizer and communication apparatus
First Claim
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1. A voltage controlled oscillator, comprising:
- a resonator configured to oscillate with an initial oscillation frequency during a starting period of oscillation and with a steady oscillation frequency during a steady state oscillation, the resonator including a film bulk acoustic resonator having a series resonance frequency higher than the steady oscillation frequency; and
a negative resistance circuit connected to the resonator, configured to drive the resonator, the negative resistance circuit having a positive increment for reactance in the steady state oscillation compared with reactance in the starting period.
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Abstract
A voltage controlled oscillator includes a resonator configured to resonate with an initial oscillation frequency during starting period of oscillation and a steady oscillation frequency during a steady state oscillation. The resonator includes a film bulk acoustic resonator having a series resonance frequency higher than the steady oscillation frequency. A negative resistance circuit configured to drive the resonator, has a positive increment for reactance in the steady state oscillation compared with reactance in the starting period.
29 Citations
17 Claims
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1. A voltage controlled oscillator, comprising:
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a resonator configured to oscillate with an initial oscillation frequency during a starting period of oscillation and with a steady oscillation frequency during a steady state oscillation, the resonator including a film bulk acoustic resonator having a series resonance frequency higher than the steady oscillation frequency; and a negative resistance circuit connected to the resonator, configured to drive the resonator, the negative resistance circuit having a positive increment for reactance in the steady state oscillation compared with reactance in the starting period. - View Dependent Claims (2, 3, 4, 5)
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6. A voltage controlled oscillator, comprising:
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a resonator driven by a negative resistance circuit, configured to oscillate with an initial oscillation frequency during a starting period of oscillation and with a steady oscillation frequency during a steady state oscillation, the resonator including a film bulk acoustic resonator having a series resonance frequency higher than the steady oscillation frequency, wherein the negative resistance circuit has a positive increment for reactance in the steady state oscillation compared with reactance in the starting period.
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7. A frequency synthesizer, comprising:
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a voltage controlled oscillator including a plurality of film bulk acoustic resonators having different resonance frequencies, configured to generate an oscillation signal, the voltage controlled oscillator comprises; a resonator configured to resonate with an initial oscillation frequency during a starting period of oscillation and with a steady oscillation frequency during a steady state oscillation, the resonator including one of the film bulk acoustic resonators having a series resonance frequency higher than the steady oscillation frequency; and a negative resistance circuit connected to each of the film bulk acoustic resonators, configured to drive the resonator, the negative resistance circuit having a positive increment for reactance in the steady state oscillation compared with reactance in the starting period; a first frequency divider configured to divide the oscillation signal from the voltage controlled oscillator and to generate a divided oscillation signal; a second frequency divider configured to divide a reference signal and to generate a divided reference signal; a phase comparator configured to compare phases of the divided oscillation signal and the divided reference signal and to generate a phase error signal; a control voltage generator configured to generate a control voltage for the voltage controlled oscillator based on the phase error signal; and a control circuit configured to generate a control signal based on the control voltage so as to select the film bulk acoustic resonators, and to control an oscillation frequency of the oscillation signal. - View Dependent Claims (8, 9, 10, 11)
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12. A frequency synthesizer, comprising:
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a voltage controlled oscillator including a plurality of film bulk acoustic resonators having different resonance frequencies, configured to generate an oscillation signal controlled by a control circuit by dividing the oscillation signal from the voltage controlled oscillator to generate a divided oscillation signal, by dividing a reference signal to generate a divided reference signal, by comparing phases of the divided oscillation signal and the divided reference signal to generate a phase error signal, and by generating a control voltage for the voltage controlled oscillator based on the phase error signal, the voltage controlled oscillator including; a resonator configured to resonate with an initial oscillation frequency during a starting period of oscillation and with a steady oscillation frequency during a steady state oscillation, the resonator including one of the film bulk acoustic resonators having a series resonance frequency higher than the steady oscillation frequency; and a negative resistance circuit connected to each of the film bulk acoustic resonators, configured to drive the resonator, the negative resistance circuit having a positive increment for reactance in the steady state oscillation compared with reactance in the starting period, wherein the control circuit generates a control signal based on the control voltage so as to select the film bulk acoustic resonators, and controls an oscillation frequency of the oscillation signal.
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13. A communication apparatus, comprising:
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a frequency synthesizer configured to provide an oscillation signal, including; a voltage controlled oscillator including a plurality of film bulk acoustic resonators having different resonance frequencies, configured to generate the oscillation signal, the voltage controlled oscillator comprises; a resonator configured to resonate with an initial oscillation frequency during a starting period of oscillation and with a steady oscillation frequency during a steady state oscillation, the resonator including one of the film bulk acoustic resonators having a series resonance frequency higher than the steady oscillation frequency; and a negative resistance circuit connected to each of the film bulk acoustic resonators, configured to drive the resonator, the negative resistance circuit having a positive increment for reactance in the steady state oscillation compared with reactance in the starting period; a first frequency divider configured to divide the oscillation signal from the voltage controlled oscillator and to generate a divided oscillation signal; a second frequency divider configured to divide a reference signal and to generate a divided reference signal; a phase comparator configured to compare phases of the divided oscillation signal and the divided reference signal and to generate a phase error signal; a control voltage generator configured to generate a control voltage for the voltage controlled oscillator based on the phase error signal; and a control circuit configured to generate a control signal based on the control voltage so as to select the film bulk acoustic resonators, and to control an oscillation frequency of the oscillation signal; a receiver configured to convert a high frequency receiving signal into an intermediate frequency receiving signal by use of the oscillation signal; a baseband processor configured to demodulate the intermediate frequency receiving signal and to modulate a transmitting signal; and a transmitter configured to transmit a radio frequency transmitting signal provided by converting the modulated transmitting signal by use of the oscillation signal. - View Dependent Claims (14, 15, 16, 17)
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Specification