| 摘要 |
PROBLEM TO BE SOLVED: To provide an amplifier in which PWM signal quantization errors generated in a digitalΣΔmodulator can be reduced. SOLUTION: The amplifier 100 comprises a subtracter 111 for generating a difference value between a voltage value of an analogue input signal and that of a feedback signal, an integrator 112 for integrating output signals of the subtracter 111, a triangular-wave signal generator 114 for generating a triangular-wave signal as a reference signal, a comparator 113 for comparing an output signal voltage value of the integrator 112 and the reference signal voltage value of the triangular-wave signal generator 114 to generate a digital PWM signal, and a delay device 115 for delaying the PWM signal output from the comparator 113 to generate the feedback signal. In addition, the amplifier may include a saw-tooth wave signal generator for generating a saw-tooth wave signal for acting as the reference signal or an inverse saw-tooth wave signal generator for generating an inverse saw-tooth wave signal. COPYRIGHT: (C)2007,JPO&INPIT
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