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US 7,453,316 B2Granted
Amplifier circuit
AssigneeOki Electric Industry Co., Ltd.
InventorNobuyuki Shimizu
Life of this patent
Estimating the term…
Abstract
An amplifier circuit includes a first clock generator and a pulse width modulator. The first clock generator outputs a first clock of which frequency is dependent on the voltage level of a power supply voltage. The pulse width modulator generates a signal having a duration proportional to data based on the first clock.
Claims8
An amplifier circuit comprising:
- a first clock generator configured to output a first clock having a frequency which is dependent on a voltage level of a power supply voltage, wherein the frequency of the first clock is decreased when the voltage level of the power supply voltage is decreased, and wherein the frequency of the first clock is increased when the voltage level of the power supply voltage is increased;
- and
- a pulse width modulator configured to generate a signal having a duration proportional to data based on the first clock.
An amplifier circuit comprising:
- a first pulse width modulator configured to generate a first signal having a first duration based on a predetermined clock, the first duration being proportional to first data;
- a second pulse width modulator configured to generate a second signal which has a second duration based on the predetermined clock the second duration being proportional to second data;
- an error integration circuit configured to output a first value which is obtained by integrating a difference between second and third values, the second value being obtained by multiplying a first current that is proportional to a power supply voltage by a duration of the first signal, the third value being obtained by multiplying a second current that is nonproportional to the power supply voltage by a duration of the second signal;
- and
- a correction circuit configured to generate the first data by correcting the second data if the first value exceeds a first predetermined value or if the first value falls below a second predetermined value.
2 more elements
Dependencies are inferred from the claim text.