Combination of a control unit and a logic application, in which the combination is connected to a system clock
The invention relates to a system ( 2 ) of a control unit ( 4 ) and a logic application ( 6 ), wherein the control unit ( 4 ) and the logic application ( 6 ) are connected to a system clock, wherein the logic application ( 6 ) comprises a series connection ( 16 ) of logic elements ( 18 ), wherein, in use, the system clock generates a clock signal ( 8 ) and feeds this clock signal to the control unit ( 4 ) and the logic application ( 6 ), and wherein the control unit ( 4 ) controls the supply voltage of the series connection ( 16 ) on the basis of the clock signal ( 8 ) such that the delay time of the series connection ( 16 ) is substantially equal to a predetermined value.
1. A system ( 2 ) of a control unit ( 4 ) and a logic application ( 6 ), wherein the control unit ( 4 ) and the logic application ( 6 ) can be connected to a system clock, wherein the logic application ( 6 ) comprises a series connection ( 16 ) of logic elements ( 18 ), wherein, in use, the system clock generates a clock signal ( 8 ) and feeds this to the control unit ( 4 ) and the series connection ( 16 ) of the logic application ( 6 ), and wherein the control unit ( 4 ) controls a first supply voltage ( 10 ) for the series connection ( 16 ) on the basis of the clock signal ( 8 ) such that the delay time of the series connection ( 16 ) is at least substantially equal to a predetermined value.
2. A system as claimed in claim 1 , characterized in that the control unit ( 4 ) comprises a first series connection ( 28 ) of logic elements ( 30 ) for emulating the series connection ( 16 ) of the logic application ( 6 ), and the series connection ( 16 ) and the first series connection ( 28 ) are placed close to each other, while, in use, the control unit ( 4 ) controls the first supply voltage ( 10 ) in dependence on the temperature of the first series connection ( 28 ).
3. A system as claimed in claim 2 , characterized in that a logical depth of the first series connection ( 28 ) is greater than a logical depth of the series connection ( 16 ) of the logic application ( 6 ), wherein the first series connection ( 28 ) of logic elements ( 30 ) can generate a delayed clock signal ( 34 ) on the basis of the clock signal ( 8 ), and the control unit ( 4 ) also comprises a reference unit ( 36 ) for generating a time-difference signal ( 38 ) on the basis of the clock signal ( 8 ) and the delayed clock signal ( 34 ), which time-difference signal ( 38 ) corresponds to a delay of the delayed clock signal ( 34 ) with respect to the clock signal ( 8 ), and the control unit ( 4 ) further comprises a control element ( 40 ) for controlling the first supply voltage ( 10 ) on the basis of the time-difference signal ( 38 ), while, in use, the first supply voltage ( 10 ) is fed to the logic elements ( 30 ) of the first series connection ( 28 ).
4. A system as claimed in claim 3 , characterized in that, in use, the control element ( 40 ) controls the first supply voltage ( 10 ) in such a way that the delay of the delayed clock signal ( 34 ) with respect to the clock signal ( 8 ) is substantially equal to a clock period of the clock signal.
5. A system as claimed in claim 3 , characterized in that the first series connection ( 28 ) has substantially the same delay characteristic as the series connection ( 16 ).
6. A system as claimed in any one of the claim 3 , characterized in that the reference unit ( 36 ) is a phase detector.
7. A system as claimed in any one of the claim 3 , characterized in that, in use, the reference unit ( 36 ) and the control element ( 40 ) are fed with a second supply voltage.