Patent ID: 7126431

Claim:
A differential delay cell comprising: a cascade current source for establishing an operating current, wherein said cascade current source has a first input for controlling the magnitude of the operating current generated; a differentially coupled transistor pair having a common node, two input nodes, and two output nodes, said common node being coupled to said current source, and said two output nodes being coupled to load devices, wherein differential output signals are generated at said two output nodes in response to input signals coupled to said two input nodes, said load devices have a predetermined load impedance, and further wherein the operating current generated by said current source is divided between said differentially coupled transistor pair and said load devices in proportion to an input voltage applied to each of said two inputs nodes, and further wherein the predetermined load impedance varies in magnitude in response to the operating current applied thereto, and an amplitude control device coupled between said two output nodes for controlling an amplitude of the differential output signals being generated.