Switched capacitor circuits
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United States of America Patent
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-
Jul 23, 1985
Grant Date -
N/A
app pub date -
Oct 4, 1983
filing date -
Oct 4, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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