On-chip impedance network with digital coarse and analog fine tuning

摘要

System and method for providing precision a self calibrating resistance circuit is described that provides for matching a reference resistor using dynamically configurable resistance networks. The resistor network is coupled to the connection, wherein the resistor network provides a configurable resistance across the connection. In addition, the resistor network comprises a digital resistor network and an analog resistor network. Also, the circuit includes control circuitry for configuring the configurable resistance based on a reference resistance of the reference resistor. The configurable resistance is configured by coarsely tuning the resistor network through the digital resistor network and fine tuning the resistor network through the analog resistor network.

主权项

1. A self calibrating resistance circuit, comprising:
a connection providing a signal from a reference resistor; a resistor network coupled to said connection, wherein said resistor network provides a configurable resistance across said connection, wherein said resistor network comprises a digital resistor network and an analog resistor network; and control circuitry for configuring said configurable resistance based on a reference resistance of said reference resistor by coarsely tuning said resistor network through said digital resistor network and fine tuning said resistor network through said analog resistor network.