Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1993-05-28
1995-02-21
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330260, 330311, H03F 345
Patent
active
053920023
ABSTRACT:
A negative impedance converter utilizes a pair of transistors in a negative feedback configuration to thereby function as a positive differential resistance. The negative impedance converter also utilizes a second pair of transistors that are coupled in a positive feedback configuration to function as a negative differential resistance. By using substantially equal values of resistors in the emitter circuit of each transistor, the negative impedance converter provides both a differential output impedance which approaches infinity and a low common mode output impedance.
REFERENCES:
patent: 3445780 (1969-05-01), Beelitz
"Digitally Programmable Continuous Time Linear Phase Lowpass Filter for Hard Disk Drives" Geert A. DeVeirmman, Richard G. Yamasak, Silicon Systems, Inc., Tustin, Calif.-Analog and Mixed Signal Design Conference, sponsored by Computer Design Magazine, held from Oct. 30, 1991 through Nov. 1, 1991 at the Santa Clara, Calif. Marriott Hotel.
IEEE Journal of Solid-State Circuits, Apr. 1991, by Shigetaka Takagi et al. "100-MHz Monolithic Low-Pass Filters with Transmission Zeros Using NIC Integrators".
IEEE Journal of Solid-State Circuits, vol. 27, No. 2, Feb. 1992, by Bram Nauta "A CMOS Transconductance-C Filter Technique for Very High Frequencies".
Paper 3-B.2, "CMOS Triode Transconductor Continuous Time Filters" by John Pennock, Peter Frith, R. G. Barker, Wilson Microelectronics Ltd. (Reprinted from IEEE CICC, pp. 378-381, 1986).
Paper 3-B.5, "Design Considerations for High-Frequency Continuous-Time Filters and Implementation of an Antialiasing Filter for Digital Video" by Gopinathan, Tsividis, et al. (Reprinted from IEEE J. Solid-State Circuits, vol. SC-25, No. 6, pp. 1368-1378, Dec. 1990.
Mullins James B.
National Semiconductor Corporation
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