Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2005-11-08
2005-11-08
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S292000
Reexamination Certificate
active
06963246
ABSTRACT:
Provided is a wideband amplifier which can provide an increased operation bandwidth without being limited by manufacturing process. A source follower circuit having a MOS transistor and constant-current supplies is provided in parallel to a MOS transistor serving as an amplifier of the input stage. Furthermore, the sources of the MOS transistor serving as the output of the source follower circuit are connected to the output nodes of the input stage amplifier via phase compensation capacitors, respectively. This configuration provides an increased phase allowance to the wideband amplifier, thereby providing an improved operation bandwidth without being limited by the manufacturing process employed.
REFERENCES:
patent: 5652545 (1997-07-01), Miyashita et al.
patent: 07-79123 (1995-03-01), None
patent: 08-116223 (1996-05-01), None
patent: 2003-69352 (2003-03-01), None
2001 IEEE International Solid-State Circuits Conference, pp. 130-131, Young-In park et al. et al. (English).
2001 IEEE International Solid-State Circuits Conference, pp. 134-135, Dan Kelly et al. (English).
“Analog Integrated Circuit”, pp. 262-264, Alen B. Grebene (English translation and its original in Japanese).
Mottola Steven J.
Nixon & Peabody LLP
Oki Electric Industry Co. Ltd.
Studebaker Donald R.
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