Apparatuses and methods for duty cycle distortion correction of clocks

1. An apparatus, comprising:

a receiver circuit configured to provide complementary clocks responsive to an input clock, the receiver circuit further configured to provide the complementary clocks having first high and low voltage amplitudes in a first mode and to provide the complementary clocks having second high and low voltage amplitudes in a second mode; and

a divider circuit configured to provide multiphase clocks responsive to the complementary clocks, wherein the multiphase clocks responsive to the complementary clocks in the second mode having less duty cycle distortion than the multiphase clocks responsive to the complementary clocks in the first mode.

2. The apparatus of claim 1 wherein the second high and low voltage amplitudes are less than the first high and low amplitudes.

3. The apparatus of claim 1 wherein the receiver circuit includes first and second variable resistances, and wherein first and second variable resistances for the second mode are less than the first and second variable resistances for the first mode.

4. The apparatus of claim 1 wherein the receiver circuit is further configured to provide the complementary clocks having a first voltage crossing point in the first mode and to provide the complementary clocks having a second voltage crossing point in the second mode, wherein the second voltage crossing point is less than the first voltage crossing point.

5. The apparatus of claim 1 wherein the receiver circuit comprises:

an input circuit configured to provide first complementary clocks based on the input clock and a complementary input clock; and

a gain circuit configured to provide the complementary clocks responsive to the first complementary clocks, the gain circuit including a first variable resistance coupled from a first output node to a reference voltage node and further including a second variable resistance coupled from a second output node to the reference voltage node, the first and second variable resistances having a first resistance for the first mode and having a second resistance for the second mode.

6. The apparatus of claim 5 wherein the receiver circuit further comprises an output circuit including a third variable resistance coupled from a third output node to the reference voltage node and further including a fourth variable resistance coupled from a fourth output node to the reference voltage node, the third and fourth variable resistances having a third resistance for the first mode and having a fourth resistance for the second mode.

7. The apparatus of claim 1 wherein the receiver circuit further comprises a resistance circuit coupled to the first and second output nodes, the resistance circuit configured to resistively couple the first and second output nodes for the second mode.

8. An apparatus, comprising:

a clock circuit configured to receive complementary input clocks and a control signal and to provide multiphase clocks responsive to complementary input clocks, the clock circuit further configured to be in a first mode or second mode controlled by the control signal and configured to provide the multiphase clocks having greater duty cycle distortion in a first mode than in a second mode, and

an input output circuit configured to receive the multiphase clocks and provide data or receive data responsive to the multiphase clocks.

9. The apparatus of claim 8 wherein the first mode corresponds to a write operation and wherein the second mode corresponds to a read operation.

10. The apparatus of claim 8 wherein the clock circuit comprises:

a receiver circuit configured to receive the complementary input clocks and provide complementary output clocks responsive to the complementary input clocks, the receiver circuit configured to provide the complementary output clocks having first voltage amplitudes in the first mode and to provide the complementary output clocks having second voltage amplitudes in the second mode that are less than the first voltage amplitudes; and

a divider circuit configured to receive the complementary output clocks and provide multiphase clocks responsive to the complementary output clocks, the multiphase clocks having one-half a clock frequency of the complementary output clocks.

11. The apparatus of claim 10 wherein the receiver circuit comprises:

a first circuit configured to provide complementary intermediate clocks responsive to the complementary input clocks when provided a first current; and

a second circuit configured to receive the complementary intermediate clocks and provide the complementary output clocks responsive to the to the complementary intermediate clocks when provided a second current, the second circuit including first and second variable resistances, the first and second variable resistances configured to be set to a first resistance in the first mode and to be set to a second resistance in the second mode, wherein the second resistance is less than the first resistance.

12. The apparatus of claim 10 wherein the divider circuit comprises first and second flip-flop circuits, each flip-flop circuit receiving the complementary output clocks and configured to receive logic levels applied to respective data inputs responsive to the complementary output clocks and provide the logic levels to respective data outputs, each of the data outputs of the first flip circuit coupled to a respective one of the data inputs of the second flip-flop circuit, and each of the data outputs of the second flip-flop circuit coupled to a respective one of the data inputs of the first flip-flop circuit, the multiphase clocks provided at the data outputs of the first and second flip-flop circuits.

13. The apparatus of claim 12 wherein each of the first and second flip-flop circuits comprises a current mode logic D flip-flop circuit.

14. The apparatus of claim 12 wherein each of the first and second flip-flop circuits comprises:

an input circuit configured to provide the logic levels to the respective data outputs responsive to one of the complementary output clocks; and

a latch circuit configured to latch the logic levels provided by the input circuit responsive to another one of the complementary output clocks.

15. A method, comprising:

providing complementary clocks responsive to an input clock; and

providing multiphase clocks responsive to the complementary clocks, wherein the multiphase clocks have a clock frequency less than the complementary clocks,

wherein the complementary clocks have a first voltage swing for a first mode and have a second voltage swing for a second mode, the second voltage swing less than the first voltage swing.

16. The method of claim 15 wherein a voltage crossing point for the complementary clocks for the second mode is less than for the first mode.

17. The method of claim 16 , further comprising coupling through a resistance a first output node at which a first one of the complementary clocks is provided to a second output node at which a second one of the complementary clocks is provided.

18. The method of claim 15 wherein a difference between a first high voltage amplitude for a first of the complementary clocks and a second high voltage amplitude for a second of the complementary clocks for the second mode is less than for the first mode.

19. The method of claim 15 wherein providing multiphase clocks responsive to the complementary clocks comprises dividing a clock frequency of the complementary clocks with a clock divider circuit.

20. The method of claim 15 wherein the complementary clocks are provided by a receiver circuit and for the first mode a resistance of the receiver circuit is greater than for the second mode.