Capacitance filter of second degree for construction of a capacitance filter structure of higher order

摘要

The invention refers to a capacitance filter of the second degree for a reversible capacitance filter structure (5C-filter). The capacitance filter contains a primary and a secondary integrator (OP3, C9 resp. OP4, C10) and to each input of the integrators a well-known dirigible change-over switch structures (SW1, SW2 resp. SW3, SW4) are connected. The filter has two inputs (b resp. c) and two outputs (a resp. d) of which the one input (b) is capacitive (via C11) connected to the other integrators (OP4, C10) input, the other input (c) is capacitive (via (C12) connected to the first integrator's input, the first output (a) is formed by the first integrator's (OP3,C9) output and the other output (d) is formed by the other integrator's (OP4, C10) output.IMAGE