Abstract: A regulated integrated circuit power supply (200) intermittently applies feedback to a charge pump (202) on a sampled basis such that a feedback circuit (204) is enabled to sense the bias voltage (Vout) at predetermined intervals of time. Based upon the value of the bias voltage (Vout) as compared to a threshold voltage (VT), the charge pump (202) is enabled to supply a voltage to the integrated circuit. Thereby, the regulated charge pump (202) does not overload the integrated circuit coupled thereto. The regulated integrated circuit power supply (200) includes the charge pump (202) coupled to the integrated circuit to supply bias voltage (Vout). Additionally, coupled to the integrated circuit, the feedback circuit (204) senses the bias voltage (Vout) and provides an output signal based upon a comparison between the bias voltage (Vout) and a voltage threshold (VT) A switch (208) connected to the feedback circuit (204) selectively enables and disables sensing of the bias voltage (Vout).

Abstract: A regulated integrated circuit power supply (200) intermittently applies feedback to a charge pump (202) on a sampled basis such that a feedback circuit (204) is enabled to sense the bias voltage (Vout) at predetermined intervals of time. Based upon the value of the bias voltage (Vout) as compared to a threshold voltage (VT), the charge pump (202) is enabled to supply a voltage to the integrated circuit. Thereby, the regulated charge pump (202) does not overload the integrated circuit coupled thereto.

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.

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 an 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.

Abstract: A reference voltage developing circuit that develops a multiple slope reference voltage that is a function of temperature. The circuit has a plurality of base-emitter multipliers each of which includes a transistor and each of which develops an output voltage that is a function of the base-emitter voltage of the transistor of the multiplier. Since the base-emitter voltage varies with changes in temperature, each multiplier circuit develops a voltage that varies with changes in temperature. The multiplier circuits have different multiplier magnitudes to thereby provide temperature dependent output voltages that have different slopes. A voltage selector circuit is connected to the multiplier circuits and it provides an output voltage that corresponds to the higher of the output voltages developed by the multiplier circuits.