Title :
A monolithic light-to-frequency converter with a scalable sensor array
Author :
Aswell, C.J. ; Berlien, J. ; Dierschke, E. ; Hassan, M.
Author_Institution :
Texas Instrum. Inc., Dallas, TX, USA
Abstract :
A single-chip CMOS light to frequency converter provides light intensity measurements with an absolute accuracy of 5% and a selectable full scale sensitivity of either 1, 10 or 100 mW/ cm/sup 2/. The device incorporates a new switched-capacitor charge-metering current-to-frequency converter with an integral bandgap reference and exhibits a measured linearity error of 0.2% for a full scale frequency of 0.5 MHz and 1% for 1 MHz. A pin-programmable divider is included on the chip so that the output can be scaled for applications that require a lower frequency. An output enable is provided so that multiple units may share the same controller input line.<>
Keywords :
CMOS integrated circuits; frequency convertors; intensity measurement; measurement errors; optical frequency conversion; optical sensors; photodiodes; sensitivity; 0.5 MHz; 1 MHz; absolute accuracy; controller input line; full scale frequency; integral bandgap reference; light intensity measurements; lower frequency; measured linearity error; monolithic light-to-frequency converter; multiple units; output enable; photodiode array; pin-programmable divider; scalable sensor array; selectable full scale sensitivity; single-chip CMOS light to frequency converter; switched-capacitor charge-metering current-to-frequency converter; Capacitors; Circuits; Diodes; Frequency conversion; Optical arrays; Oscillators; Photodiodes; Sensor arrays; Switches; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 1994. Digest of Technical Papers. 41st ISSCC., 1994 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-1844-7
DOI :
10.1109/ISSCC.1994.344688
