RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number 110106654, filed Feb. 25, 2021, which is herein incorporated by reference.

BACKGROUND

Technical Field

The present disclosure relates to a latch circuit and a sensing amplifier. More particularly, the present disclosure relates to a latch circuit and a sensing amplifier which have better performance.

Description of Related Art

With developments of circuit technology, latch circuits and sensing amplifiers are applied in various circuitries. However, in some related arts, short currents are generated in latch circuits during signal transitions. In addition, in some related arts, the sensing amplifiers have kickback noise problems.

SUMMARY

Some aspects of the present disclosure are to provide a latch circuit. The latch circuit includes a first current source, a second current source, a third current source, a fourth current source, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, and an eighth transistor. The first current source and the third current source are coupled at a first output node. The second current source and the fourth current source are coupled at a second output node. A control terminal of the first transistor and a control terminal of the second transistor are coupled to the second output node. A control terminal of the third transistor and a control terminal of the fourth transistor are coupled to the first output node. The first transistor and the fifth transistor are coupled in series between a power terminal and the first output node. The sixth transistor and the second transistor are coupled in series between the first output node and a ground terminal. The third transistor and the seventh transistor are coupled in series between the power terminal and the second output node. The eighth transistor and the fourth transistor are coupled in series between the second output node and the ground terminal. The fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor are turned on or turned off based on a clock signal.

Some aspects of the present disclosure are to provide a sensing amplifier. The sensing amplifier includes a first comparator circuit, a logic circuit, and a latch. The first comparator circuit is configured to generate a first comparison signal and a second comparison signal according a first input signal, a second input signal, and a first clock signal. The logic circuit is configured to generate a first control signal, a second control signal, a third control signal, and a fourth control signal based on the first clock signal, the first comparison signal, and the second comparison signal. The latch circuit includes a first current source, a second current source, a third current source, a fourth current source, a first transistor, a second transistor, a third transistor, and a fourth transistor. The first current source and the third current source are coupled at a first output node. The first control signal is configured to control the first current source, and the third control signal is configured to control the third current source. The second current source and the fourth current source are coupled at a second output node. The second control signal is configured to control the second current source, and the fourth control signal is configured to control the fourth current source. A control terminal of the first transistor and a control terminal of the second transistor are coupled to the second output node. A control terminal of the third transistor and a control terminal of the fourth transistor are coupled to the first output node.

Based on the descriptions above, the present disclosure can prevent the latch circuit from generating the short current during signal transitions. In addition, the sensing amplifier can improve performance by using kickback noise. Accordingly, the latch circuit and the sensing amplifier of the present disclosure have better performance.

