Integrated circuit interconnection structure having precision terminating resistors

An integrated circuit interconnection structure comprising:

• a driver circuit in a integrated circuit device;
• a transmission line having a series of loads connected thereto;
• said driver circuit driving said loads through said transmission line;
• the last load in said series of loads being located in an integrated circuit chip which has a variable terminating resistor;
• means for generating and applying a voltage to said variable terminating resistor to adjust its resistance so that there is precise termination of said line;
• and
• said means for generating a voltage comprises a voltage comparator having a reference voltage and signal voltage inputs and an output which is the difference between the referenced and signal voltages.

An integrated circuit interconnection structure comprising:

• a driver circuit in an integrated circuit device;
• a transmission line having a series of loads connected thereto;
• said driver circuit driving said loads through said transmission line;
• the last load in said series of loads being located in an integrated circuit chip which has a variable terminating resistor;
• means for generating and applying a voltage to said variable terminating resistor to adjust its resistance so that there is precise termination of said line;
• and
• said means for generating and applying a voltage is on the same integrated circuit device as said last load and variable resistor.

An integrated circuit interconnection structure comprising:

• a driver circuit is an integrated circuit device;
• a transmission line having a series of loads connected thereto;
• said driver circuit driving said loads through said transmission line;
• the last load in said series of loads being located in an integrated circuit chip which has a variable terminating resistor;
• means for generating and applying a voltage to said variable terminating resistor to adjust its resistance so that there is precise termination of said line;
• and
• emitter coupled logic circuits are used in the said driver circuit and said loads.

An integrated circuit interconnection structure comprising:

• a driver circuit in an integrated circuit device;
• a transmission line having a series of loads connected thereto;
• said driver circuit driving said loads through said transmission line;
• the last load in said series of loads being located in an integrated circuit chip which has a variable terminating resistor;
• means for generating and applying a voltage to said variable terminating resistor to adjust its resistance so that there is precise termination of said line;
• and
• transistor-transistor coupled logic circuits are used in the said driver circuit and said loads.

An integrated circuit interconnection structure comprising:

• a driver circuit in an integrated circuit device;
• a transmission line having a series of loads connected thereto;
• said driver circuit driving said loads through said transmission line;
• the last load in said series of loads being located in an integrated circuit chip which has a variable terminating resistor;
• means for generating and applying a voltage to said variable terminating resistor to adjust its resistance so that there is precise termination of said line;
• and
• diode-transistor logic circuits are used in the said driver circuit and said loads.

In an integrated circuit interconnection structure having a driver circuit connected to and driving a plurality of loads which are connected to a transmission line and which transmission line is terminated by a terminating resistor, the improvement comprising:

• the said terminating resistor is a variable resistor and located in the integrated circuit of the last of said plurality of loads;
• means for generating and applying a voltage to said variable resistor to adjust its resistance so that there is a precise termination of said line;
• and
• said variable resistor is a P type pinch resistor having electrical contacts to its ends, a first N+ region centrally located within said P type resistor, a second N+ region located on the opposite side of said P type resistor to that of said first N+ type region, and a contact to said first N+ region to apply said voltage to adjust the resistance of said variable resistor.