Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1994-06-03
1996-01-02
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330292, H03F 345
Patent
active
054812259
ABSTRACT:
A variable gain differential amplifier using a single operational amplifier. A potentiometer is used in the negative feedback loop with one end connected to ground through a resistor which limits the maximum gain. The other end is connected to the output and the wiper is connected through a minimum gain limiting resistor to the inverting terminal. This provides an amplifier with good CMRR, relatively low input impedance, wide gain control and variability with a single operational amplifier.
REFERENCES:
patent: 3832646 (1974-08-01), Szabo et al.
patent: 4206416 (1980-06-01), Kellogg
An Introduction To Operational Amplifiers, 2nd ed., Luces M. Faulkenberry, Texas State Tech. Instit., John Wiley & Sons, 1977/82, pp. 390 & 391.
Operational Amplifier Characteristics & Applications, 2nd ed., Robert G. Irvine, California State Poly. Univ., Pomona, Prentice Hall, Inc., Englewood Cliffs, N.J., 1981, pp. 144/5/6.
Flum Alan
Lumsden John
Miller Jerry A.
Mottola Steven
Sony Electronics Inc.
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