Title:
【発明の名称】スイツチト・キヤパシタ回路
Document Type and Number:
Japanese Patent JPS61500144
Kind Code:
A
Abstract:
A switched capacitor biquadratic filter (10; 20) includes means for dynamically shifting the level of the input voltage (VB, VD; VX, VY,) 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 (VB, VD; VX, VY) 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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| JPS61199318 | ACTIVE FILTER |
Inventors:
Ganesan, Apaladyan
Application Number:
JP50338784A
Publication Date:
January 23, 1986
Filing Date:
September 10, 1984
Export Citation:
Assignee:
American Telefon and Telegraph Kampani-
International Classes:
H03H19/00; (IPC1-7): H03H19/00
Domestic Patent References:
| JPS5723625B2 | 1982-05-19 |
Attorney, Agent or Firm:
Masao Okabe