| 摘要 |
A delay cell circuit ( 200 ) is disclosed. The delay cell circuit may include a differential stage ( 202 ) and a cross-coupled stage ( 204 ). The cross-coupled stage can include resistors ( 210 - 0 and 210 - 1 ) the function to reduce a gain. The differential stage ( 202 ) and cross-coupled stage ( 204 ) can include variable currents sources ( 208 and 212 ), respectively. As frequency of operation increases, variable current source ( 208 ) provides a larger current to the differential stage ( 202 ) and variable current source ( 212 ) provides a smaller current to cross-coupled stage ( 204 ). Delay cell circuit ( 200 ) may be used in a voltage controlled oscillator (VCO). By including gain attenuating devices such as resistors ( 210 - 0 and 210 - 1 ), a frequency tuning range of the VCO may be increased.
|
