| 摘要 |
PROBLEM TO BE SOLVED: To provide an amplitude compressor that is easily integrated into an IC in a MOS process. SOLUTION: When an input signal Vin is fed to a PWM modulation section 10, the input signal Vin is PWM-modulated depending on a modulation degree decided by a control signal Cs and a PWM modulation signal Vm is generated. An amplitude detection section 30 detects an amplitude of an output signal Vout based on a signal V' that is an inverse of the PWM modulation signal Vm to generate the control signal Cs in response to the detection result. Since the control signal Cs is given as positive and negative power supplies vh, vl of a buffer 13, a feedback amount of an operational amplifier 11 is adjusted thereby to adjust a modulation degree of the PWM modulation signal Vm. A demodulation section 20 demodulates the PWM modulation signal Vm to generate the output signal Vout. |
