Precision on-chip transmission line termination

A circuit on an integrated circuit for terminating a transmission line, where said integrated circuit is capable of being connected to an external reference resistor, comprising:

• a first configurable resistor array;
• a comparator;
• wherein said comparator is used to configure said first configurable resistor array to form a first resistor network that has a resistance of a predetermined relationship to said reference resistance;
• a second configurable resistor array;
• wherein said second configurable resistor array is configured to form a second resistor network;
• and
• wherein resistance of said second resistor network is of a predetermined relationship to the resistance of said first resistance network.

A circuit on an integrated circuit for terminating a transmission line comprising:

• a resistor array comprising:
• a plurality of resistor and transistor configurations connected in parallel, wherein each resistor and transistor configuration comprises:
• an array resistor;
• and
• an array switching device;
• and
• array enabling logic connected to each of said switching devices, wherein one or more of said switching devices is a pair of transistors configured to form a transmission gate.

A circuit on an integrated circuit for terminating a transmission line comprising:

• a resistor array comprising:
• a plurality of resistor and transistor configurations connected in parallel, wherein each resistor and transistor configuration comprises:
• an array resistor,
• an array switching device, and
• array enabling logic connected to each of said array switching devices;
• a resistance control block connected to said array enabling logic;
• a comparator comprising two inputs and an output;
• and
• wherein the resistor array is connected to one of said inputs and said output is connected to said resistance control block.