Voltage comparator

A voltage comparator for comparing an input voltage with a reference voltage, said voltage comparator comprising:

• comparing means (T1 to T10), and clock-signal controlled switching means (S1 to S4) connected to said comparing means for energizing the comparing means upon a transition of a clock signal, determining means (M1, M2, X, M3, V) for determining the a completion of a comparison and for controlling the clock-signal controlled switching means (S1 to S4) for de-energizing the comparing means when the completion of a comparison is determined, a voltage divider (D) for dividing the input voltage to be compared, the clock-signal controlled switching means comprising a switch (S8) connected in series with the voltage divider (D) for inhibiting the a flow of current through the voltage divider when the comparison means is de-energized wherein said comparing means having two substantially identical outputs (N1, N2), said clock-signal controlled switching means being arranged to force different voltages to said two substantially identical outputs when the comparing means is de-energized and said determining means comprising an exclusive OR gate (X) connected to said two substantially identical outputs for determining the completion of a comparison when the two output voltages of said two substantially identical outputs are substantially equal and for controlling, through a clock controlled latch (L2), the de-energizing of the comparing means and the inhibition of current flow through the voltage divider.