Pros Cons Good points Single LC-VCO is used Loop bandwidth variation is within +10% Phase noise is nearly constant Integrated rms phase error is sub-1 。 Problems Process limits the minimum values of capacitors and varactors Add a little complexity in layout design RFIC-Atlanta June 15-17,2008RFIC – Atlanta June 15-17, 2008 4 Pros & Cons • Good points – Single LC-VCO is used – Loop bandwidth variation is within ±10% – Phase noise is nearly constant – Integrated rms phase error is sub-1° • Problems – Process limits the minimum values of capacitors and varactors – Add a little complexity in layout design