Method and apparatus for calibrating a multi-level current mode driver having a plurality of source calibration signals
AssigneeRambus Inc.
InventorsCarl Werner, Mark Horowitz, Pak Chau, Scott Best, Stefanos Sidiropoulos
Life of this patent
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Abstract
A current controller for a multi-level current mode driver. The current controller includes a multi-level voltage reference and at least one source calibration signal. A comparator is coupled by a coupling network to the multi-level voltage reference and the at least one source calibration signal. A selected voltage is applied from the multi-level voltage reference and a selected source calibration signal is applied from the at least one source calibration signal to the comparator.
Claims24
A multiple pulse amplitude modulated driver (multi-PAM driver), comprising:
- a data signal terminal;
- and
- first and second driver circuits coupled with the data signal terminal to drive alternating data symbols communicated by the multi-PAM driver via the data signal terminal, wherein the first and second driver circuits include a first plurality of binary weighted driver transistors.
A multiple pulse amplitude modulated driver (multi-PAM driver), comprising:
- a first encoder to receive input data associated with even data symbols and to output encoded signals associated with the even data symbols;
- a second encoder to receive input data associated with odd data symbols and to output encoded signals associated with the odd data symbols;
- a data signal terminal;
- a driver circuit coupled with the data signal terminal, the driver circuit including a plurality of binary weighted driver transistors;
- and
- a switching circuit for selectively coupling the encoded signals associated with the odd and even data symbols to the driver circuit.
Dependencies are inferred from the claim text.