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1. WO1992017939 - COMPARATEUR A ACTIVATION PAR IMPULSION CMOS

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[ EN ]

CLAIMS

1. A strobed comparator for generating an output voltage indicative of the state of the voltage difference between first and second input voltages which may be applied thereto at respective first and second input terminals, upon a strobing signal going from a first state to a second state, comprising:

a. a first output driver connected between a first internal node and a first output node;

b. a second output driver connected between a second internal node and a second output node;

c. means for sensing the difference between the input voltages and for driving the first and second internal nodes to corresponding first and second voltages;

d. first means responsive to the means for sensing, for disabling the means for sensing when the strobe signal is applied in a first state and enabling the means for sensing when the strobe signal switches to a second state;

e. second means for disabling the means for sensing once the means for sensing has resolved the difference between the first and second input voltages; and f. means responsive to the strobe signal for precharging the first and second internal nodes to a voltage independent of the first and second input voltages when the strobe signal is applied in said first state.

2. The comparator of claim 1 wherein the first means for disabling essentially prevents the means for sensing from drawing supply current when the strobe signal is applied in said first state.

3., The comparator of claim 1 wherein the output drivers are inverters.

4. The comparator of claim 3 wherein each of said output drivers is formed of a complementary pair of field effect transistors (FETs) having their respective source electrodes adapted to be
connected, respectively, to receive first and second supply voltages and the FETs being sized to provide output voltages which are both logical zero values when the voltage difference between the first and second input voltages is too small for the means for sensing to resolve and the first and second internal modes accordingly are driven to substantially the same voltage.

5. A strobed comparator for generating an output voltage indicative of the state of the voltage difference between first and second input voltages which may be applied thereto at respective first and second input terminals, upon a strobing signal going from a first state to a second state, comprising:

a. a first output driver connected between a first internal node and a first output node;

b. a second output driver connected between a second internal node and a second output node;

c. means responsive to the strobe signal for precharging the first and second internal nodes to a voltage independent of the first and second input voltages when the strobe signal is applied in a first state;

d. means for sensing the difference between the input voltages and for driving the first and second internal nodes to corresponding first and second voltages;

e. first means responsive to the means for sensing, for disabling the means for sensing when the strobe signal is applied in said first state, so that no static current is drawn by the means for sensing, and enabling the means for sensing when the strobe signal switches to a second state; and f . second means for disabling the means for sensing so that no static current is drawn by the means for sensing, but preserving the voltages at the first and second internal nodes, once the means for sensing has resolved the difference between the first and second input voltages.