Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2008-12-23
2010-06-15
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S261000
Reexamination Certificate
active
07737783
ABSTRACT:
A differential amplifier comprises a left amplifier having transistors, a right amplifier having transistors, a negative feedback network having a resistor, and a negative feedback network having a transformer with a center tap. Phase compensation networks comprising a capacitor and a resistor, a capacitor and a resistor, and a capacitor and a resistor are further added to the amplifier. Both ends of a secondary winding of the transformer are connected to the output terminals of the right and left amplifiers, and the center tap of the secondary winding is grounded, so that a differential amplified output signal can be fed back to a single-phase input using one transformer, thereby reducing a cost and an area.
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European Search Report of corresponding European Patent Application No. 08022567.5.
K. Van Hartingsveldt, M.H.L. Kouwenhoven, C.J.M. Verhoeven, “HF Low Noise Amplifiers with Integrated Transformer Feedback”, ISCAS 2002, vol. 2, pp. II-815 to II-818, May 2002.
Baker & McKenzie LLP
Choe Henry K
Icom Incorporated
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