Joseph I Irish, 8121832 Shockley Rd, Slaughter Beach, DE 19963

5883378, Mar 16, 1999

Jul 30, 1996

8/692935

Joseph Irish - Mount Kisco NY
Luigi Cantatore - White Plains NY
Leon Chaparian - Waldick NJ
Paul J. Roach - late of Mount Kisco NY

Bayer Corporation - Tarrytown NY

H01J 4014

250214A

A system and methods for transmitting analog signals, particularly analog signals derived from an optical signal intensity, in a noisy environment over a length of cable. The optical signal is sensed by a photodetector, which is bootstrapped and backbiased to minimize the capacitive effect of the photodetector, and converted to a voltage by a transconductance stage. The voltage signal is then driven over a length of cable by a buffer amplifier having a low impedance output substantially matched to the characteristic impedance of the cable (e. g. , twin lead wires having a Z. sub. 0 =120), to a second circuit board. The cable length may be, e. g, less than a meter. The second circuit board contains a high gain amplifier stage and circuits for processing the high gain amplifier signal to derive, e. g, a peak pulse amplitude corresponding to the peak intensity of the optical signal sensed at the first circuit board. The processing circuit also may include circuits to discriminate valid pulses from invalid pulses so that only valid pulse data is retained.