| 摘要 |
PURPOSE: A current controlled variable delay circuit is provided to have low phase noise and a high speed switching. CONSTITUTION: The current controlled variable delay circuit comprises a variable current source(500), and a switching transistor part(100) forming a current path between the variable current source and one of the first and the second differential output signal(+Vout,-Vout) of the first or the second potential level in response to the first and the second differential input signal(V+,V-). A differential signal sensing part(200) generates the first and the second differential output signal by amplifying a different between the first and the second differential input signal in response to an output of the switching transistor part and operates in a saturated region. A positive feedback amplification part(300) increases a sensing speed of the differential signal sensing part by receiving an output of the differential signal sensing part as an input. And a potential level decreasing part(400) reduces noise of the first and the second differential output signal by reducing a potential difference between the first and the second differential output signal, and increases a response speed of the first or the second differential output signal responding to the first and the second differential input signal.
|
