Output driver for multi-level signaling
A driver of a multi-level signaling interface is provided. The driver may be configured reduce noise in a multi-level signal (e.g., a pulse amplitude modulation signal) generated by the driver using switching components of different polarities. The driver may include a pull-up circuit and/or a pull-down circuit. The pull-up circuit and the pull-down circuit may include at least one switching component of a first polarity (e.g., nmos transistor) and at least one switching component of a second polarity different from the first polarity (e.g., pmos transistor). Such a configuration of pull-up and pull down circuits may generate a more linear relationship between an output current and an output voltage of an output of the driver, thereby improving one or more characteristics of the multi-level signal.
1. A method, comprising:
identifying a plurality of information bits to be read from an array of memory cells;
generating a multi-level signal modulated using a first modulation scheme having at least three levels based at least in part on the plurality of information bits using a driver having a pull-up circuit including a first switching component having a first gate polarity and a second switching component having a second gate polarity different than the first gate polarity; and
transmitting the multi-level signal to a controller of a memory device.
2. The method of claim 1 , wherein generating the multi-level signal further comprises:
activating the first switching component during a first time period; and
activating the second switching component during a second time period that overlaps with the first time period.
3. The method of claim 1 , wherein the driver includes a pull-down circuit including a third switching component having the first gate polarity and a fourth switching component having the second gate polarity.
4. The method of claim 3 , wherein generating the multi-level signal further comprises:
activating the third switching component during a third time period; and
activating the fourth switching component during a fourth time period that overlaps with the third time period.
5. The method of claim 3 , further comprising:
generating a linear output current relative to an output voltage of the first, second, third, and fourth switching components using the first switching component and the second switching component.
6. The method of claim 3 , wherein:
the first switching component and the third switching component are pmos transistors; and
the second switching component and the fourth switching component are nmos transistors.
7. The method of claim 1 , further comprising:
identifying an output of the multi-level signal based at least in part on the plurality of information bits, wherein generating the multi-level signal is based at least in part on the identified output.
8. The method of claim 7 , further comprising:
determining a timing sequence for activating the pull-up circuit and a pull-down circuit of the driver based at least in part on the identified output, wherein generating the multi-level signal is based at least in part on the timing sequence.
9. The method of claim 7 , further comprising:
determining a gate voltage for each switching component of the driver based at least in part on the identified output, wherein generating the multi-level signal is based at least in part on the gate voltage.