Techniques for improving amplifier linearity

Details Techniques for improving amplifier linearity Techniques for improving amplifier linearity

2011-05-03

2011-05-03

Nguyen, Hieu P (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

C330S149000

Reexamination Certificate

active

07936220

ABSTRACT:
Techniques for improving the linearity of a cascode amplifier. In an exemplary embodiment, an auxiliary common-gate amplifier is provided in parallel with the principal cascode branch. The auxiliary common-gate amplifier samples a cascoded node in the principal cascode branch. The auxiliary common-gate amplifier generates a current which, when combined with the current generated by the principal cascode branch, cancels a distortion component to generate an output current with improved linearity characteristics. In an exemplary embodiment, a phase shifting network couples the cascoded node to the auxiliary common-gate amplifier, and may include, e.g., a capacitor coupled to an inductor.

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