PPA improvement for voltage mode driver and on-die termination (ODT)

A voltage mode driver, comprising:

• a pull-down stage including:
• a first circuit having a plurality of nMOS devices in parallel, the plurality of nMOS devices being common to a first resistor;
• a second circuit in parallel with the first circuit and having an nMOS device in series with a second resistor;
• and
• X-2 additional circuits in parallel with the first and second circuits, each additional circuit having an additional nMOS device in series with an additional resistor,
• wherein the second circuit is configured to be enabled when a pulldown impedance of the first circuit, with the second circuit disabled and all of the nMOS devices of the first circuit turned on, is greater than a desired pulldown impedance, and
• wherein each of the first circuit through a Yth circuit are configured to be enabled when a condition is met that the pulldown impedance of the first through the (Y-1) th circuits, with the Yth circuit disabled and all of the nMOS devices of the first through the (Y-1) th circuits turned on, is greater than the desired pulldown impedance, and
• wherein X is an integer greater than 2, and Y is an integer greater than 1.