Hybrid driver circuit

摘要

In one embodiment, a voltage mode driver circuit includes a first voltage adjusting circuit configured to provide an adjustable first pseudo-supply voltage to a first node based on a first supply voltage, including generating the first pseudo-supply voltage based on a first reference voltage and feedback from the first node. In this embodiment, the voltage mode driver circuit includes switching circuitry configured to selectively couple one of the first node or a second node to a first differential output terminal and a different one of the first node or the second node to a second differential output terminal based on a data signal. In this embodiment, the voltage mode driver circuit includes a current mode emphasis driver configured to selectively couple one of the first differential output terminal or the second differential output terminal to a first set of one or more current supplies and a different one of the first differential output terminal or second differential output terminal to a second set of one or more current supplies, based on one or more emphasis signals.

主权项

1. A voltage mode driver circuit, comprising:
a first voltage adjusting circuit configured to provide an adjustable first pseudo-supply voltage to a first node based on a first supply voltage, wherein the first voltage adjusting circuit includes first amplifier circuitry configured to generate the first pseudo-supply voltage based on a first reference voltage and feedback from the first node; switching circuitry configured to selectively couple one of the first node or a second node to a first differential output terminal and a different one of the first node or the second node to a second differential output terminal, based on a data signal; a current mode emphasis driver configured to selectively couple one of the first differential output terminal or the second differential output terminal to a first set of one or more current supplies and a different one of the first differential output terminal or second differential output terminal to a second set of one or more current supplies, based on one or more emphasis signals; and calibration circuitry configured to adjust impedance of a circuit element coupled to maintain a particular output impedance at the first differential output terminal, based on the first pseudo-supply voltage.