A 1.2GHz wide bandwidth integer-N type-I PLL

A wide bandwidth integer-N Type-I PLL is proposed in this paper. By using a novel Delay-line based filter as loop filter, presented PLL achieves a loop bandwidth about 5 times greater than that of standard type-I PLL. The chosen strategy in widening the PLL bandwidth is to replace the RC loop filter with a 2-tap delay-line based filter which provides a desired magnitude and phase response. Presented PLL obtains a loop bandwith of about 5MHz with an input reference frequency of 10MHz, and also -50dBc spur level is achieved. - 119 dBc/Hz in-band phase noise at 1MHz offset is obtained from simulation. PLL total power consumption is 2.5mW from the nominal supply of 1.8V.