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US 8,412,120 B2Granted
Phase-locked circuit and radio communicating device
AssigneeSony Corporation
InventorsTetsuya Fujiwara, Shingo Harada
Life of this patent
Estimating the term…
Abstract
Disclosed herein is a phase-locked circuit including: a phase-locked section including a voltage controlled oscillator having a capacitance bank and changing oscillation frequency according to voltage information, the phase-locked section phase-locking an oscillating signal of the voltage controlled oscillator to a reference signal; and a calibration section having a voltage correcting function for supplying an appropriate calibration voltage to the voltage controlled oscillator in performing frequency calibration for the voltage controlled oscillator; the calibration section including a counter circuit, a first storage circuit and a second storage circuit, a comparator circuit, a control circuit, a voltage generating circuit, and a processing circuit.
Claims8
A phase-locked circuit comprising:
- a phase-locked section including a voltage controlled oscillator having a capacitance bank and changing oscillation frequency according to voltage information, the phase-locked section phase-locking an oscillating signal of said voltage controlled oscillator to a reference signal;
- and
- a calibration section having a voltage correcting function for supplying an appropriate calibration voltage to said voltage controlled oscillator in performing frequency calibration for said voltage controlled oscillator;
- said calibration section including
- a counter circuit for counting frequency of the output oscillating signal of said voltage controlled oscillator,
- a first storage circuit and a second storage circuit for retaining a count result of said counter circuit,
- a comparator circuit for comparing the count result of said counter circuit with a target frequency, and determining whether the count result of said counter circuit is higher than the target frequency,
- a control circuit for receiving a result of said comparator circuit, comparing the count result of said counter circuit with a result retained by said first storage circuit, and controlling the capacitance bank of said voltage controlled oscillator,
- a voltage generating circuit for generating the calibration voltage, and supplying the calibration voltage to said voltage controlled oscillator, and
- a processing circuit for performing calculation from the count result of said counter circuit and results of said first storage circuit and said second storage circuit, and controlling said voltage generating circuit according to a result of the calculation.
7 more elements
A radio communicating device comprising:
- an antenna receiving a radio signal;
- a phase-locked circuit for outputting an oscillating signal phase-locked to a reference signal;
- a low noise amplifier for controlling a gain of the received signal received by the antenna;
- a first frequency converting section configured to subject the received signal received via said low noise amplifier to frequency conversion receiving the oscillating signal of said phase-locked circuit;
- a second frequency converting section configured to subject a transmission signal to frequency conversion receiving the oscillating signal of said phase-locked circuit;
- and
- a power amplifier configured to amplify the transmission signal resulting from the frequency conversion of said second frequency converting section, and output the transmission signal to a side of said antenna;
- said phase-locked circuit including
- a phase-locked section including a voltage controlled oscillator having a capacitance bank and changing oscillation frequency according to voltage information, the phase-locked section phase-locking the oscillating signal of said voltage controlled oscillator to the reference signal, and
- a calibration section having a voltage correcting function for supplying an appropriate calibration voltage to said voltage controlled oscillator in performing frequency calibration for the voltage controlled oscillator,
- said calibration section including
- a counter circuit for counting frequency of the output oscillating signal of said voltage controlled oscillator,
- a first storage circuit and a second storage circuit for retaining a count result of said counter circuit,
- a comparator circuit for comparing the count result of said counter circuit with a target frequency, and determining whether the count result of said counter circuit is higher than the target frequency,
- a control circuit for receiving a result of said comparator circuit, comparing the count result of said counter circuit with a result retained by said first storage circuit, and controlling the capacitance bank of said voltage controlled oscillator,
- a voltage generating circuit for generating the calibration voltage, and supplying the calibration voltage to said voltage controlled oscillator, and
- a processing circuit for performing calculation from the count result of said counter circuit and results of said first storage circuit and said second storage circuit, and controlling said voltage generating circuit according to a result of the calculation.
14 more elements
Dependencies are inferred from the claim text.