Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-11-13
2007-11-13
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S277000
Reexamination Certificate
active
11181891
ABSTRACT:
A current source block and a negative resistance generation block are connected in parallel. The negative resistance generation block generates a negative resistance in response to the minute variations of an output voltage. Thus the output resistance of a current source circuit is given by the combined resistance of the negative resistance and the resistance of a resistor in the current source block connected in parallel. The resistance of the resistor in the current source block and the negative resistance are controlled to be substantially the same to thereby increase the output resistance of the current source circuit. The current source circuit serves to increase an output resistance when viewed from an differential output terminal. As a result, use of this current source circuit realizes a differential amplifier providing a high gain.
REFERENCES:
patent: 5936466 (1999-08-01), Andoh et al.
Razavi; “Operational Amplifiers”;Design of Analog CMOS Integrated Circuits; Chapter 9; pp. 296-299; c . . 2001; McGraw Hill.
Behzad, R., Design of Analog CMOS Integrated Circuits, 2001, pp. 514-515, The McGraw-Hill Companies, Inc., New York, NY, USA.
Kamakura Masaomi
Miki Takahiro
McDermott Will & Emery LLP
Nguyen Khanh Van
Renesas Technology Corp.
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