Abstract: The conventional circuit model of a bit-stream adder based on sigma delta (Σ Δ ) modulation is improved with pipeline technology to make it work correctly at high frequencies. The integrated circuit (IC) of the bit-stream adder is designed with the source coupled logic structure and designed at the transistor level to increase the operating frequency. The IC is fabricated in TSMC's 0.18-μ m CMOS process. The chip area is 475 × 570 μ m². A fully digital Σ Δ signal generator is designed with a field programmable gate array to test the chip. Experimental results show that the chip meets the function and performance demand of the design, and the chip can work at a frequency of higher than 4 GHz. The noise performance of the adder is analyzed and compared with both theory and experimental results. oindent

Key words: bit-stream, adder, sigma delta, digital signal generator oindent