Method and apparatus for a fully differential amplifier...

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Reexamination Certificate

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C330S253000, C330S255000, C330S277000, C330S257000, C330S258000, C330S269000, C330S285000, C330S261000, C330S133000, C330S311000, C327S563000

Reexamination Certificate

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07119616

ABSTRACT:
The input stage of the fully differential amplifier output stage is configured in a differential pair configuration with a tail current. The tail current is divided between two legs of the input stage and is higher in the leg that has the higher of the two input voltage levels (in or inb). The devices in each leg of the fully differential amplifier output stage may be cascoded to avoid electrical voltage overstress. The top device in each leg of the differential input stage may be coupled in a diode configuration and is utilized to mirror the current into another NMOS current mirror as well as to a PMOS output device. The gate of the PMOS output devices are connected in a cross-coupled configuration. The NMOS current mirrors are utilized to mirror the current into the NMOS output devices in a non-cross-coupled configuration.

REFERENCES:
patent: 5446412 (1995-08-01), Kimyacioglu et al.
Holt Electronic Circuit Digital and Analog John Wiley and Sons 1978 p. 637.

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