Research Article

Passive Switched Capacitor RF Front Ends for Spectrum Sensing in Cognitive Radios

Figure 12

A 16-point radix-2 decimation-in-time FFT (a) and DFT twiddle factors coefficients on the unit circle (b).
947373.fig.0012a
(a) 16-point radix-2 decimation-in-time FFT
947373.fig.0012b
(b) DFT twiddle factors