Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-06-26
1994-05-10
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307520, 307521, 330107, H03F 132, H03K 500
Patent
active
053111419
ABSTRACT:
An active filter having a frequency characteristics of the fewer variations of manufacturing and the least temperature dependency is provided. A differential amplifier is comprised of resistors 15 and 16 which have a resistance value R.sub.E and are connected in common to a current source 39 in proportion to kT/(qR.sub.0), together with transistors 13 and 14. The transistor 14 is connected to an active load comprised of transistors 18 and 19. The transistor 18 is connected to a current source 31 for producing a current in proportion to a capacity C.sub.0 while the transistor 19 is connected to a current source 30 for producing a current of a remainder of the current produced by the current source 31 subtracted from the current in proportion to 1/R.sub.a. The transistor 19 is further connected to an internal capacitor 21 having capacity C.sub.1. A frequency characteristics of the active filter circuit is determined by the ratio of resistance values R.sub.E, R.sub.0 and R.sub.a and the ratio of the capacities C.sub.O and C.sub.1, and a term of an ambient temperature is cancelled.
REFERENCES:
patent: 4818903 (1989-04-01), Kawano
patent: 4851718 (1989-07-01), Hagino et al.
patent: 4881043 (1989-11-01), Jason
patent: 4926139 (1990-05-01), Anderson et al.
patent: 5001441 (1991-03-01), Gen-Kuong
patent: 5124592 (1992-06-01), Hagino
patent: 5192884 (1993-03-01), Kusano
Sakaguchi Yasunori
Umeyama Takehiko
Callahan Timothy P.
Mitsubishi Denki & Kabushiki Kaisha
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