Distance measurement signal processing circuit and distance measuring apparatus

2012 
A signal processing circuit (20) comprises a multistage amplifying circuit (30), N comparing circuits (40), N time measuring circuits (50) and a TOF estimating circuit (70). The second to N-th stage amplifying circuits (A(2) to A(N)) in the multistage amplifying circuit (30) are non-inverting amplifying circuits. The TOF estimating circuit (70) calculates delay time differences {T m (n) - T m (n + 1)} from measured times T m (n) and T m (n + 1) measured by the time measuring circuits (50), then estimates the magnitudes of measured signal current (Ip) on the basis of the delay time differences, thereafter estimates, on the basis of the magnitudes of the measured signal currents (Ip), delay times T d (n) included in the measured times T m (n), and subtracts the delay times T d (n) from the measured times T m (n), thereby calculating a flight time T TOF . In this way, a wide distance range can be measured and the TOF can be measured with high precision.
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