Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1996-04-10
1997-11-11
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327558, 327559, 327311, 327344, 327336, 333172, 330294, 330107, H03K 500, H04B 110
Patent
active
056868618
ABSTRACT:
A filter circuit that consumes very little electric power. The active filter is a linear inverter constructed by 1) an inverting amplifying portion composed of an odd number of MOS inverters serially connected, 2) a grounded capacitance connected between an output of the inverting amplifying portion and ground, 3) a balancing resistance having a pair of resistances for connecting an output of one of the MOS inverters, other than the last MOS inverter, to the supply voltage and the ground, respectively, and 4) a feedback impedance for connecting the output and input of the inverting amplifying portion. A coupling capacitance is connected to the input of the linear inverter and a plurality of filter circuits are connected to an input of the coupling capacitance.
REFERENCES:
patent: 3857104 (1974-12-01), Sacks
Imada et al., "Practical Analog Filter Designing Method", CQ Shuppan Kabushiki Kaisha, 1989, p. 9, Figure 1.1, p. 34, Figure 2.1, p. 43, Figure 2.5.
"Free Filter for Serial Data", D.S. Fenna, Electronic Product Design, Mar. 1982, p. 22.
Shou Guoliang
Takatori Sunao
Yamamoto Makoto
Callahan Timothy P.
Le Dinh T.
Sharp Kabushiki Kaisha
Yozan Inc.
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