Analog CMOS implementation of FFT using cascode current mirror

Discrete Fourier Transform plays a vital role in the field of Digital Signal Processing. Fast Fourier Transform is an efficient algorithm to compute Discrete Fourier Transform. A novel method for the analog CMOS implementation of FFT using cascode current mirror is proposed. FFT is implemented using simple and cascode current mirrors and the results are compared for real and complex inputs. The proposed method gives more accurate results than that using simple current mirrors. The circuit implementation is rigorously verified for 4-point and 8-point FFTs. Simulation was done using Micro-Cap 10. The proposed method offers better accuracy for higher point FFTs.