Patent ID: 7479808

Claim:
A threshold circuit arrangement comprising: a comparator circuit configured to compare an input signal with a predetermined threshold and, depending on the result of the comparison, adapting an output signal to change its state; and a threshold circuit configured to prevent the change of state of the output signal in the case of predetermined forms of the input signal, the circuit comprising: a flip flop providing a disable signal at an output, wherein the change of state of the output signal is prevented as a function of state of the disable signal; a first comparator having an output coupled to a first input of the flip flop; a second comparator having an output coupled to a second input of the flip flop; the input signal coupled to an input of the second comparator, to an input of a third comparator, and to an input of a fourth comparator; a signal representing the predetermined threshold coupled to an input of the third comparator; and an integrator having an input coupled between outputs of the third and fourth comparators via an addition element and an output coupled to an input of the first comparator.