A 5‐Gbps low‐power low‐jitter voltage‐mode transmitter with two‐tap pre‐emphasis and impedance calibration in 65‐nm CMOS

Abstract

A low-power low-jitter voltage-mode (VM) transmitter with two-tap pre-emphasis and impedance calibration for high-speed serial links is presented. Based on a comprehensive analysis of the relationship between impedance, supply current, and preemphasis of the output driver, an impedance control circuit (ICU) is presented to maintain the 50 output impedance and suppress the reflection, a self-biased regulator is proposed to regulate the power supply, and an edge driver is introduced to speed up the signal transition time. Therefore, the signal integrity (SI) of the transmitter is improved with low power consumption. The whole transmitter is implemented in 65-nm CMOS technology. It provides an eye height greater than 688 mV at the far end with a root-mean-squared jitter of less than 6.99 ps at 5 Gbps. The transmitter consumes 15.2 mA and occupies only 370 μm × 230 μm.