Temperature compensated and supply independent clipping distorti

Details Temperature compensated and supply independent clipping distorti Temperature compensated and supply independent clipping distorti

1994-06-30

1995-08-15

Mottola, Steven

Amplifiers

With amplifier condition indicating or testing means

330149, 330289, H03F 126, H03F 130

Patent

active

054423163

ABSTRACT:
A circuit and method are provided for generating a clipping distortion detector output signal for an integrated circuit audio amplifier which is independent of operating temperature and supply voltage. The system includes an audio amplifier having a voltage gain, a first input for receiving input voltage and an output for generating an amplified output voltage. A supply voltage is supplied to the audio amplifier and the supply voltage determines the maximum amplified output voltage. A comparison voltage is generated which is indicative of the output voltage divided by the voltage gain. A clip detector voltage comparator receives the input voltage and the comparison voltage and provides a clipping distortion detect signal when the input voltage deviates from the comparison voltage in excess of an offset voltage which is indicative of detection of excessive clipping distortion. The output voltage is adaptively controlled as a function of the supply voltage so as to maintain a substantially constant maximum percent distortion. In addition, the offset voltage is also controlled as a function of temperature to provide temperature compensation. The supply voltage and temperature compensation may be achieved by generating a current source as a function of supply voltage and temperature.

REFERENCES:
patent: 3891933 (1975-06-01), Suzuki et al.
patent: 4048573 (1977-09-01), Evans et al.
patent: 4318053 (1982-03-01), Sondermeyer
patent: 5068620 (1994-01-01), Botti et al.

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