350nm
-------------------------------------------------------
Ring Oscillator Freq.                                   
  DIV256 (31-stg,3.3V)                163.21  MHz        
  D256_THK  (31-stg,5.0V)             121.61  MHz        
 Ring Oscillator Power                                   
  DIV256 (31-stg,3.3V)                0.16  uW/MHz/gate
  D256_THK  (31-stg,5.0V)             0.31  uW/MHz/gate


                                      250nm
-------------------------------------------------------
Ring Oscillator Freq.                                   
  DIV1024 (31-stg,2.5V)               261.99  MHz        
  D1024_THK (31-stg,3.3V)             229.82  MHz        
 Ring Oscillator Power                                   
  DIV1024 (31-stg,2.5V)               0.06  uW/MHz/gate
  D1024_THK (31-stg,3.3V)             0.11  uW/MHz/gate


                                      180nm
-------------------------------------------------------
Ring Oscillator Freq.                                   
  D1024_THK (31-stg,3.3V)             302.91  MHz        
  DIV1024 (31-stg,1.8V)               377.13  MHz        
 Ring Oscillator Power                                   
  D1024_THK (31-stg,3.3V)             0.07  uW/MHz/gate
  DIV1024 (31-stg,1.8V)               0.02  uW/MHz/gate

Summary (3.3v):
  
nm: 350----250----180
Hz: 163----230----303
Pwr: 16-----11-----07
            06     02
          (2.5v) (1.8v)