Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1997-05-22
1999-08-24
Lam, Tuan T.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327238, 327254, H03K 500, H03K 513
Patent
active
059429291
ABSTRACT:
An active phase splitter comprises two or more phase shift circuits. Each phase shift circuit comprises a number of active devices and capacitors. For a single-pole active phase splitter, within each phase shift circuit, two active devices are configured as a cascode amplifier. The first active device is configured as a common source amplifier and the second active device is configured as a common gate amplifier. A capacitor is connected across the gate and drain of the first active device to generates the necessary pole-zero pair for the phase shift circuit. The cascode configuration results in the desired transfer function and provides transconversion of voltage input to current outputs. Active phase splitters with two or more poles can be built using the same inventive concept.
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"Analysis and Design of Analog Integrated Circuits, Second Edition" by Paul Gray and Robert Mayer, Frequency Response of Integrated Circuits; pp. 444-446.
Edmonston Brian S.
Lam Tuan T.
Miller Russell B.
Qualcomm Incorporated
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