Amplifier circuit having integral means for detecting and preven

Details Amplifier circuit having integral means for detecting and preven Amplifier circuit having integral means for detecting and preven

1976-01-08

1977-02-01

Rolinec, R. V.

Amplifiers

Combined with automatic amplifier disabling switch means

330 9, 330 30D, 330207P, H03F 114

Patent

active

040064280

ABSTRACT:
An amplifier circuit including provision for detecting non-linear circuit operation caused by the application of input signals that exceed either the amplifier dynamic range or the amplifier slewing capability is disclosed. The amplifier circuit includes the cascaded combination of a voltage amplifier stage, a voltage-to-current converter stage, a current limiter stage and an output stage. A first signal, obtained at the junction between a capacitor and resistor that are series connected between the signal common or ground potential and the input terminal to the output stage, is compared with a second signal obtained at the input terminal of the voltage to current converter stage. When the amplifier circuit is operating within the linear region these two signals are of equal magnitude or exhibit some other known relationship to one another. If, however, the amplifier operation is non-linear, due to either the application of an input signal of an amplitude that exceeds the linear dynamic range of the amplifier or due to an applied input signal having a time rate of change that exceeds the amplifier slew rate capability, a detectable increase in the voltage difference between the first and second signals occurs. This detected signal can be utilized for a number of functions including either disconnecting the improper input signal from the amplifier input terminals or conditioning the signal such that it lies within the linear operating range of the amplifier.

REFERENCES:
patent: 3678402 (1972-07-01), Tempel
patent: 3891933 (1975-06-01), Suzuki et al.

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