Dynamic transmitter calibration
AssigneeQUALCOMM Incorporated
InventorsJaseem Ahammed, Patrick Isakanian, Ashwin Sethuram
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Abstract
A driver circuit includes a flipflop and a first plurality of series-coupled delay elements. The flipflop may be configured to encode a sequence of codewords in a multibit signal. The first plurality of series-coupled delay elements may be configured to propagate the multibit signal to a tuning circuit in the driver circuit during voltage ramping of a power supply used by the driver circuit. Each codeword in the sequence of codewords may be used to configure the tuning circuit during the voltage ramping of the power supply. The sequence of codewords may be configured to incrementally change impedance of the driver during the voltage ramping of the power supply.
Claims19
A driver circuit comprising:
- a flipflop configured to encode a sequence of codewords in a multibit signal;
- and
- a first plurality of series-coupled delay elements that is configured to propagate the multibit signal to a tuning circuit in the driver circuit during voltage ramping of a power supply used by the driver circuit,
- wherein each codeword in the sequence of codewords is used to configure the tuning circuit during the voltage ramping of the power supply, and
- wherein the first plurality of series-coupled delay elements comprises a first configurable delay element configured to propagate rising edges more quickly than it propagates falling edges.
A driver, comprising:
- a flipflop configured to encode a sequence of codewords in a multibit signal;
- a first plurality of series-coupled delay elements that is configured to propagate the multibit signal to a tuning circuit in the driver circuit during voltage ramping of a power supply used by the driver circuit,
- wherein each codeword in the sequence of codewords is used to configure the tuning circuit during the voltage ramping of the power supply;
- and
- a second plurality of series-coupled delay elements that receives an output of the first plurality of series-coupled delay elements, wherein each delay element in the second plurality of series-coupled delay elements is configured to propagate the output of the first plurality of series-coupled delay elements to a corresponding segment of the driver circuit.
An apparatus comprising:
- means for encoding a sequence of codewords in a multibit signal;
- and
- means for propagating the multibit signal to a tuning circuit in a driver circuit during voltage ramping of a power supply used by the driver circuit, wherein each codeword in the sequence of codewords is used to configure the tuning circuit during the voltage ramping of the power supply, wherein the means for propagating the multibit signal comprises a first plurality of series-coupled delay elements that includes a first configurable delay element configured to propagate rising edges more quickly than it propagates falling edges.
A method for reconfiguring a driver circuit, comprising:
- encoding a sequence of codewords in a multibit signal;
- propagating the multibit signal to a tuning circuit in the driver circuit during voltage ramping of a power supply used by the driver circuit, wherein the propagating the multibit signal comprises providing the multibit signal to a first plurality of series-coupled delay elements that comprises a first configurable delay element configured to propagate rising edges more quickly than it propagates falling edges;
- and
- using each codeword in the sequence of codewords to configure the tuning circuit during the voltage ramping of the power supply.
Dependencies are inferred from the claim text.