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.
Claims20
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 odd and even data symbols that are to be driven by the drive circuit to the data signal terminal.
Dependencies are inferred from the claim text.