Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1983-10-04
1985-07-23
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
307523, 328151, 330 9, H03H 1900, G11C 2702
Patent
active
045311064
ABSTRACT:
A switched capacitor biquadratic filter (10; 20) includes means for dynamically shifting the level of the input voltage (V.sub.B, V.sub.D ; V.sub.X, V.sub.Y,) of the amplifiers (12, 14), so that the need for a level shifting stage in the amplifiers (12; 14) is eliminated. The normally grounded nodes associated with the input ports of the amplifiers (12; 14) are set to a reference voltage (V.sub.B, V.sub.D ; V.sub.X, V.sub.Y) which shifts the inputs to a level appropriate to result in an analog grounded voltage at the outputs of the amplifiers. Internal level shifting stages are thereby eliminated from the amplifiers (12; 14). This gives the filter (10, 20) a broader operating frequency range.
Also disclosed is a particular design for the amplifiers (12, 14) which includes a folded cascode mirror configuration.
REFERENCES:
patent: 4315227 (1982-02-01), Fleischer et al.
AT&T - Technologies, Inc.
Nussbaum Marvin L.
Ulbrich Volker R.
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