Patent US 5,281,860

A method and apparatus for an improved multiple channel sensor interface circuit is described which comprises a plurality of input integrator circuits (35) coupled in parallel; a switched capacitor multiplexer (37) coupled to the input integrator circuits (35); and an output integrator stage (39) coupled to the switched capacitor multiplexer (37). An additional embodiment is described wherein a multiple channel voltage sensor interface circuit comprising a plurality of switched capacitor storage elements (S26 . . . S28) is coupled to a plurality of inputs; a plurality of integrator amplifiers (51, 53) is coupled to the switched capacitor storage elements (C22 . . . C30); and timing circuitry is coupled to the switched capacitor storage elements (C221 . . . C30) and to integrator amplifiers (51, 53) operable to selectively enable sampling of the inputs.