Shock sensor circuitry and method for amplifying an input signal including leakage currents

摘要

A shock sensor circuitry (26) is provided for processing an input signal generated by a shock sensor (28) in response to the shock sensor (28) detecting a force or shock. The shock sensor circuitry (26) includes a leakage tolerant input amplifier (38) for receiving the input signal, and any leakage currents that may also be provided, and amplifying the input signal to generate an amplified input signal. The leakage tolerant input amplifier (38) provides an ac gain of ten and a dc gain of zero. The shock sensor circuitry (26) also includes a filter and amplification circuit and a window comparator. The filter and amplification circuit filters the amplified input signal and amplifies select frequencies of the amplified input signal to generate a summed signal that is provided to the window comparator and compared to a reference value. The window comparator includes an upper comparator (58), a lower comparator (60), and an output circuit (62) to generate a shock sensor circuitry output signal that indicates whether a shock or force was received at a magnitude greater than the reference value.