A Pseudo-Raised Cosine IR-UWB pulse generator with adaptive PSD using 130nm CMOS process

Abstract

This paper presents the design of a Pseudo-Raised Cosine Impulse Radio Ultra-Wide Band (IR-UWB) pulse generator with adaptive PSD (Power Spectrum Density) that produces pulse shaping just altering the number of oscillations and amplitude. The complete pulse generator circuit is composed of 11 blocks of edge combiner stages implemented with high impedance circuits each, a digital control block, and a filter. This circuit can generate from four to eleven oscillations per clock edge to compose a PRC (Pseudo-Raised Cosine) at the output. The proposed circuit operates at about 10.3 GHz and generates three basic pulses, with a range of 10, 20 and 30 mV and four other amplitude combinations. The post-layout simulations were performed using the Cadence Spectrum/Virtuoso, and the dynamic energy varied from 5.02 fJ with four oscillations to 16.11 fJ with eleven oscillations per pulse, respectively. Thus, the maximum PSD peak is −60 dBm, the minimum is −72 dBm with a voltage supply of 1.2 V. Finally, the Pulse Repetition Frequency (PRF) of 100 MHz and the size of the main chip occupies an area of 0.042 mm2 (without pads).