New Concept of 3.2-4.8 GHz Impulse Generator for UWB Transmitter

A new design of Ultra-Wide band (UWB) generator is described in this paper. The UWB impulse generator circuit is the most essential block in a mono-band UWB transmitter. The proposed ultra wide band impulse generator circuit utilizes the performances of the CMOS technology e®ectively, it is composed of a voltage controlled oscillator (VCO), and a rectangular pulse generator (RPG) and mixer. The RPG circuit consists of a frequency divider 1/128 circuit, time delay, N-inverters and AND gate function. The impulse UWB generator is based on the rectangular pulse modulated with the aim of generating the UWB impulse signal. This proposed circuit generates an output signal which is de ̄ned by the bandwidth of 1.6GHz at centered frequency of 4GHz and the limited Power Spectral Density (PSD) is 41:47 dBm=MHz. The peak-to-peak amplitude of the UWB impulse signal is 528mV, the output impulse width of 2 ns and the impulse repetition period (PRP) is 32 ns. The power consumption is about 12.5mW at 2.5V voltage supply.