Differential amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Reexamination Certificate

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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.

REFERENCES:
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patent: 3401326 (1968-09-01), Hunter
patent: 3885219 (1975-05-01), Vaughn
patent: 5216379 (1993-06-01), Hamley
patent: 7633344 (2009-12-01), Yamaguchi
patent: 2004/0046592 (2004-03-01), Nakajima et al.
patent: 2007/0290745 (2007-12-01), Vitzilaios et al.
patent: 2010/0052784 (2010-03-01), Yamaguchi
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.

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