Driver calibration methods and circuits

摘要

Described are amplifiers that facilitate high-speed communication with calibrated drive strength and termination impedance. Drivers and termination elements can be divided into a number N of parallel portions, one or more of which can be disabled and updated without interfering with signal (e.g., clock or data) transmission. Some embodiments identify inactive elements by examining incoming signals.

主权项

1. An amplifier comprising:
an input node; an output node; a supply terminal; a plurality of drive elements coupled in parallel between the supply terminal and the output node, each of the drive elements including a calibration port, an enable port, and a control terminal coupled to the input node; and an impedance calibration control block coupled to the calibration ports.