Amplifiers – With semiconductor amplifying device – Including balanced to unbalanced circuits and vice versa
Reexamination Certificate
2008-08-19
2010-11-16
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including balanced to unbalanced circuits and vice versa
C330S117000
Reexamination Certificate
active
07834703
ABSTRACT:
An amplifier provided according to an aspect of the present invention includes a set of passive impedances forming a tuned load to a gain stage and also to provide a 180 degrees phase shifted signal of a gain signal received from the gain stage. The output of the gain stage and the 180 degrees phase shifted signal together form a differential amplified signal corresponding to an input signal gained by the gain stage. In an embodiment, the set of passive impedances includes a three terminal centre tapped inductor in combination with a capacitor, together operating as a filter to pass only a desired frequency band. The windings of the inductor may be designed to provide mutual coupling between two portions such that there is a negative correlation between the strength of the received gained signal and the 180 degree phase shifted signal.
REFERENCES:
patent: 7224231 (2007-05-01), Wu
patent: 7538618 (2009-05-01), Park et al.
Brady III Wade James
Choe Henry K
Neerings Ronald O.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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