Amplifier output voltage swing extender circuit and method

Details Amplifier output voltage swing extender circuit and method Amplifier output voltage swing extender circuit and method

2007-10-09

2007-10-09

Mottola, Steven J. (Department: 2817)

Amplifiers

Sum and difference amplifiers

C330S144000

Reexamination Certificate

active

11337041

ABSTRACT:
An amplifier output voltage swing extender circuit comprises a differential amplifier powered between first and second power supply rails, which receives first and second input signals at non-inverting and inverting inputs, respectively, and provides an output at a first output node. A level shifting circuit, preferably a voltage divider, is connected in series with the first output node and shifts the node voltage toward the second rail by a fixed amount; the shifted voltage is provided at a second output node. A feedback network couples the second output node voltage to the amplifier's inverting input, such that when a voltage VSET is applied to the non-inverting input, the maximum negative voltage excursion at the first and second output nodes is greater than the value of the VSET voltage with respect to the second supply rail.

REFERENCES:
patent: 6624693 (2003-09-01), Yamashita
patent: 7224226 (2007-05-01), Kojima et al.

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