Amplifier output stage having enhanced drive capability

Details Amplifier output stage having enhanced drive capability Amplifier output stage having enhanced drive capability

1995-12-26

1997-11-04

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330269, 330273, 330275, H03F 330

Patent

active

056844328

ABSTRACT:
The invention is an operational amplifier having an output stage for enhancing the output driver capability near the negative source voltage. The output stage of the invention includes a voltage detector in combination with a current redirector or redirecting arrangement. The voltage detector converts the voltage difference between the amplifier output and the input to the output stage of the amplifier to a control current, which is redirected at the positive source voltage and applied to the negative output driver. The current redirector, which is operably connected to the voltage detector, allows the amplifier output to be driven at full rated current (e.g., approximately 40 mA) close to the negative source voltage (e.g., within approximately 1.5 volts) while maintaining an output configuration appropriate for stability.

REFERENCES:
patent: 4405902 (1983-09-01), van de Plassche et al.
patent: 4542348 (1985-09-01), Lucas et al.
patent: 4587491 (1986-05-01), Koterasawa
patent: 4803442 (1989-02-01), Hogg
patent: 4922208 (1990-05-01), Susak et al.

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