A low-power time interval measurement chip with sub-nanosecond resolution

An integrated time measurement unit for use in portable, low power laser rangefinding devices is described. It is implemented with 1.2 /spl mu/m CMOS technology and has a measurement range of 10 us and an accuracy of /spl plusmn/0.2 ns over the temperature range 0...60/spl deg/C and supply voltage range 4.5...5.5 V. Single shot time measurement resolution is /spl plusmn/0.9 ns. Nominal current consumption is 3 mA.<
>