| 摘要 |
<p>A wide frequency, low voltage oscillator includes multiple delay elements, in which each delay element (300) includes two inverters (204, 208) coupled through a latching element (212) into a differential-type configuration. Two current-source PMOS devices (266, 270) bias the latching element in a high-gain region at low-voltage. By coupling these current-source PMOS devices into the delay elements, the start-up voltage of the latching element is reduced. Each delay element is also biased using a replica bias circuit (302) that scales the supply/control voltage of the oscillator and provides the scaled supply/control voltage to control the lower rail of oscillation amplitude. By coupling the replica bias circuit to the lower rail, the lower rail of the oscillation amplitude follows the changes to the supply/control voltage.</p> |
