Abstract
This brief presents a single-ended transmitter for a low-power DRAM that switches equalization modes to provide improved matching to channel impedance and reduced energy consumption. The transmitter’s voltage-mode driver responds to the incoming data by selecting between phase equalization and current-mode amplitude equalization. The impedance matching with the channel is further improved by reducing the variation in on-resistance exhibited by the driver. A prototype chip that uses supply voltages of 0.5 V for the driver, and 1.05 V for rest of the blocks, was fabricated in a 65 nm CMOS process and occupied 0.0698 mm2. This prototype can compensate for a channel loss of 11.8 dB at a data-rate of 12 Gb/s while consuming 1.30 pJ/bit.
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