DC level transition detecting circuit for sensor devices

Details DC level transition detecting circuit for sensor devices DC level transition detecting circuit for sensor devices

1997-10-08

1999-09-07

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 34, 327517, H03K 5153, H03K 17945

Patent

active

059492570

ABSTRACT:
The DC sensor signal S, on which a low frequency waviness component S1 and a high frequency noise component S2, is obtained by amplitude detecting for a sinusoidal output signal from a touch signal probe. For generating a touch trigger signal TG at an sbrupt DC level transition of the DC sensor signal S, the signal S is input to a LPF 21 to output a signal (S0+S1), where S0 is a DC offset component, and S1 is a low frequency waviness component. The amplitude transforming circuit 22 multiplies the signal (S0+S1) by a coefficient k to generate a reference signal k(S0+S1). The comparator 23 compares the DC sensor signal S with the reference signal to output the touch trigger signal TG at the abrupt DC transition point of the DC sensor signal S.

REFERENCES:
patent: 4339727 (1982-07-01), Kage et al.
patent: 5142554 (1992-08-01), Stribling et al.
patent: 5307196 (1994-04-01), Kinoshita
patent: 5392317 (1995-02-01), Cho et al.
patent: 5438289 (1995-08-01), Kan et al.

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