Temperature compensated apd detector bias and transimpedance...

Details Temperature compensated apd detector bias and transimpedance... Temperature compensated apd detector bias and transimpedance...

G - Physics

01

S

G01S 17/08 (2006.01) G01C 3/02 (2006.01) G01S 7/486 (2006.01) H03F 3/08 (2006.01) G01S 7/497 (2006.01)

Patent

CA 2176627

Laser range finder circuitry (FIG. 1) including an avalanche photodiode detector (315), a capacitor (C1) for storing a detector bias voltage,and a transimpedance amplifier (317) for amplifying the detector signal. The capacitor (C1) is charged in response to a first control signal (Iup) by a circuit employing first and second field effect transistors (Qb1, Qb2) and is dischargedin response to a second control signal (IDN) by a circuit employing a third field effect transistor (Qb4). An overload protection circuit including a single diode (CR3) is provided to accommodate excessive charge created by backscatter upon initial laser firing. A temperature sensor (319) is provided to develop atemperature signal which may be monitored to adjust the detector bias voltage and other parameters so as to permit use of an associated laser range finder over a wide range of temperatures.

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