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US 2011/0215872 A1Published application
Semiconductor integrated circuit
AssigneeKabushiki Kaisha Toshiba
InventorHiroyuki KOBAYASHI
Life of this patent
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Abstract
A semiconductor integrated circuit includes: digitally controlled oscillators; a phase-data output unit; an integration processing unit; a filter unit; a multiplier (a first multiplier) that outputs, as an oscillator tuning word, a value obtained by multiplying an output signal subjected to time division from the filter unit with a predetermined coefficient; and an output selector (a tuning-word separating unit) that allocates the oscillator tuning word to the digitally controlled oscillators in synchronization with a reference frequency.
Claims19
A semiconductor integrated circuit comprising:
- an oscillation-frequency-signal generating unit that comprises a plurality of digitally controlled oscillators, oscillation frequencies of oscillation signals of which are controlled according to oscillator tuning word;
- a phase-data output unit that outputs a plurality of phase data that added up count values obtained by counting numbers of waves of the oscillation signals and phase differences between the oscillation frequencies of the oscillation signals and a reference frequency;
- an integration processing unit that outputs integration values of frequency setting data of the digitally controlled oscillators in synchronization with the reference frequency;
- a filter unit that filters a difference value, in synchronization with the reference frequency, between the phase data from the phase-data output unit and the integration value from the integration processing unit;
- and
- a gain adjusting unit that outputs the oscillator tuning word obtained by multiplying output signals from the filter unit with a predetermined coefficient to the oscillation-frequency-signal generating unit as in synchronization with the reference frequency.
3 more elements
A semiconductor integrated circuit comprising:
- an oscillation-frequency-signal generating unit that comprises a first digitally controlled oscillator, an oscillation frequency of an first oscillation signal of which is controlled according to a first oscillator tuning word and a second digitally controlled oscillator, an oscillation frequency of a second oscillation signal of which is controlled according to a second oscillator tuning word;
- a phase-data output unit that outputs first and second phase data that added up count value obtained by counting a number of waves of the first or second oscillation signal and a phase difference between the oscillation frequency of the first or second oscillation signal and a reference frequency;
- an integration processing unit that outputs a first integration value of a first frequency setting data and a second integration value of a second frequency setting data in synchronization with the reference frequency;
- a filter unit that filters a difference value between the first or second phase data and the first or second integration value in synchronization with the reference frequency;
- and
- a gain adjusting unit that outputs the first and second oscillator tuning words obtained by multiplying an output signal from the filter unit with first or second coefficients to the first and second digitally controlled oscillators.
3 more elements
A semiconductor integrated circuit comprising:
- an oscillation-frequency-signal generating unit that comprises a first digitally controlled oscillator, an oscillation frequency of a first oscillation signal of which is controlled according to a first oscillator tuning word and a second digitally controlled oscillator, an oscillation frequency of a second oscillation signal of which is controlled according to a second oscillator tuning word;
- a phase-data output unit that output phase data that added up the first or second count value obtained by counting a number of waves of the first or second oscillation signal and a phase difference between a third oscillation frequency based on the first and second oscillation frequencies and a reference frequency;
- an integration processing unit that outputs a first integration value of a first frequency setting data and a second integration value of a second frequency setting data in synchronization with the reference frequency;
- a filter unit that filters a difference value between the first or second phase data and the first or second integration value in synchronization with the reference frequency;
- and
- a gain adjusting unit that outputs as the first and second oscillator tuning words obtained by multiplying output signal from the filter unit with first or second coefficients to the first and second digitally controlled oscillators.
3 more elements
Dependencies are inferred from the claim text.