AMPLIFYING CIRCUIT AND AMPLIFYING METHOD
First Claim
1. An amplifying circuit for amplifying an input signal having a waveform that alternates repeatedly between a first section where a signal value varies within a variation range limited by at least one of upper and lower limit values and a second section that is a section other than the first section, comprising:
- a waveform modifying unit which changes the signal value in the second section in such a manner as to reduce a difference between the signal strength of a DC component of the input signal and the limit value that limits the variation range of the signal value in the first section;
a DC component removing unit which removes the DC component of the input signal after the input signal has been modified by the waveform modifying unit; and
an amplifying unit which amplifies the input signal whose DC component has been removed.
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Accused Products
Abstract
An amplifying circuit includes: a waveform modifying unit which changes the signal value in the second section in such a manner so as to reduce the difference between the signal strength of a DC component of the input signal and the limit value that limits the variation range of the signal value in the first section; a DC component removing unit which removes the DC component of the input signal after the input signal has been modified by the waveform modifying unit; and an amplifying unit which amplifies the input signal whose DC component has been removed.
11 Citations
11 Claims
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1. An amplifying circuit for amplifying an input signal having a waveform that alternates repeatedly between a first section where a signal value varies within a variation range limited by at least one of upper and lower limit values and a second section that is a section other than the first section, comprising:
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a waveform modifying unit which changes the signal value in the second section in such a manner as to reduce a difference between the signal strength of a DC component of the input signal and the limit value that limits the variation range of the signal value in the first section; a DC component removing unit which removes the DC component of the input signal after the input signal has been modified by the waveform modifying unit; and an amplifying unit which amplifies the input signal whose DC component has been removed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An amplifying circuit comprising:
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an amplifier which amplifies an AC signal; an envelope signal generating unit which generates an envelope signal of the AC signal, wherein the envelope signal has a waveform that alternates repeatedly between a first section where a signal value varies within a variation range limited by at least one of upper and lower limit values and a second section that is a section other than the first section; a waveform modifying unit which changes the signal value in the second section in such a manner as to reduce a difference between the signal strength of a DC component of the envelope signal and the limit value that limits the variation range of the signal value in the first section; a DC component removing unit which removes the DC component of the envelope signal after the envelope signal has been modified by the waveform modifying unit; an amplifying unit which amplifies the envelope signal whose DC component has been removed; and a supply voltage adjusting unit which adjusts a supply voltage for the amplifier in accordance with the envelope signal amplified by the amplifying unit.
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10. A method for amplifying an input signal having a waveform that alternates repeatedly between a first section where a signal value varies within a variation range limited by at least one of upper and lower limit values and a second section that is a section other than the first section, the method comprising:
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changing the signal value in the second section in such a manner as to reduce a difference between the signal strength of a DC component of the input signal and the limit value that limits the variation range of the signal value in the first section; removing the DC component of the input signal after the signal value in the second section has been changed; and amplifying, using a first amplifier, the input signal whose DC component has been removed. - View Dependent Claims (11)
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Specification