A cmos addition unit

Abstract

The invention discloses a CMOS addition unit, which uses the first PMOS transistor and the fourth PMOS transistor as pre-charging transistors, uses the second PMOS transistor and the fifth PMOS transistor as anti-charge leakage transistors, and consists of the third NMOS transistor and the fourth NMOS transistor. tube, the fifth NMOS tube, the seventh NMOS tube and the eighth NMOS tube form the PDN Carry evaluation network, which consists of the twelfth NMOS tube, the thirteenth NMOS tube, the fourteenth NMOS tube, the fifteenth NMOS tube, the tenth NMOS tube Six NMOS tubes, the seventeenth NMOS tube and the eighteenth NMOS tube form the PDN Sum, the first NMOS tube, the second NMOS tube, the sixth NMOS tube, the tenth NMOS tube, the eleventh NMOS tube and the nineteenth NMOS tube As evaluation transistors respectively, the third PMOS transistor and the sixth PMOS transistor, the ninth NMOS transistor and the twentieth NMOS transistor constitute an inverter respectively; the advantage is that the delay and power consumption-delay product of the overall circuit are improved, It has small circuit delay and power-delay product at both low frequency and high frequency operation.

Description

technical field [0001] The invention relates to an adding unit, in particular to a CMOS adding unit. Background technique [0002] As the basic computing unit of electronic systems, the full adder is widely used in many VLSI systems. For example, in high-performance microprocessors and DSP processors, the computing power of a full adder is very important. The operation of a full adder is often in the critical path of high-performance processor system components, especially in the arithmetic logic unit, the operation performance of a full adder plays a very critical role in the performance of the processor. As the computing speed of the microprocessor becomes faster and faster, the demand for a fast one-bit full adder is also higher and higher, and its speed, power consumption, and area performance will directly affect the overall performance of the entire integrated circuit. [0003] The circuit types of the existing adding unit mainly include static logic and dynamic logic...

AI Technical Summary

Problems solved by technology

However, the dynamic logic circuit itself also has some factors that lead to poor circuit performance: such as charge leakage effects, charge sharing problems, etc. These effects often cause the circuit (especially at high frequencies) to consume more energy. In the environment of large-scale integrated circuit design, there will be huge losses

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