05254883 is referenced by 320 patents and cites 15 patents.

Electrical current source circuitry for a bus is described. The circuitry includes transistor circuitry coupled between the bus and ground for controlling bus current, control circuitry coupled to the transistor circuitry, and a controller coupled to the control circuitry for controlling the transistor circuitry. The controller comprises a variable level circuit comprising setting circuitry for setting a desired current for the bus and transistor reference circuitry coupled to the setting circuitry. The variable level circuit provides a first voltage. Voltage reference circuitry provides a reference voltage. Comparison circuitry is coupled to the voltage reference circuitry and to the variable level circuit for comparing the first voltage with the reference voltage. Logic circuitry is responsive to a trigger signal from the comparison circuitry. An output of the logic circuitry is coupled to the control circuitry in order to turn on the transistor circuitry in a manner dependent upon an output of the logic circuitry.

Title
Electrical current source circuitry for a bus
Application Number
7/872919
Publication Number
5254883
Application Date
April 22, 1992
Publication Date
October 19, 1993
Inventor
Wingyu Leung
Cupertino
CA, US
James A Gasbarro
Mountain View
CA, US
Mark A Horowitz
Palo Alto
CA, US
Agent
Blakely Sokoloff Taylor & Zafman
Assignee
Rambus
CA, US
IPC
H03K 19/003
View Original Source