Dynamically producing an effective impedance of an output driver with a bounded variation during transitions thereby reducing jitter

A method for reducing a reflection coefficient below a predetermined value during state transitions of a driver comprising the steps of:

• receiving a data signal by an input of said driver, wherein a pad is coupled to said driver, wherein said driver comprises a pull-up driver coupled to said input, wherein said pull-up driver is configured to drive said pad to a logic high voltage level, wherein said pull-up driver comprises a plurality of transistors, wherein said driver further comprises a pull-down driver coupled to said input, wherein said pull-down driver is configured to drive said pad to a logic low voltage level, wherein said pull-down driver comprises a plurality of transistors;
• switching each of said plurality of transistors in said pull-up driver from a first state to a second state in a staggered manner;
• and
• switching each of said plurality of transistors in said pull-down driver from said second state to said first state in said staggered manner;
• wherein in response to switching each of said plurality of transistors in said pull-up driver from said first state to said second state in said staggered manner and in response to switching each of said plurality of transistors in said pull-down driver from said second state to said first state in said staggered manner a portion of current flows from said pull-up driver to said pull-down driver thereby producing an effective impedance of said driver to sufficiently reduce said reflection coefficient of said effective impedance of said driver below said predetermined value during switching of said pad.

A system, comprising:

• a first integrated circuit, wherein said first integrated circuit comprises a driver coupled to a pad;
• and
• a second integrated circuit, wherein said second integrated circuit comprises a receiver coupled to said driver via a bus;
• wherein said driver comprises:
• an input configured to receive a data signal;
• a pull-up driver coupled to said input, wherein said pull-up driver is configured to drive said pad to a logic high voltage level, wherein said pull-up driver comprises a plurality of transistors;
• and
• a pull-down driver coupled to said input, wherein said pull-down driver is configured to drive said pad to a logic low voltage level, wherein said pull-down driver comprises a plurality of transistors;
• wherein each of said plurality of transistors in said pull-up driver are switched from a first state to a second state in a staggered manner, wherein each of said plurality of transistors in said pull-down driver are switched from said second state to said first state in said staggered manner, wherein in response to switching each of said plurality of transistors in said pull-up driver from said first state to said second state in said staggered manner and in response to switching each of said plurality of transistors in said pull-down driver from said second state to said first state in said staggered manner a portion of current flows from said pull-up driver to said pull-down driver thereby producing an effective impedance of said driver to sufficiently reduce a reflection coefficient of said effective impedance of said driver below a predetermined value during switching of said pad.