A 5-Gb/s low-power transmitter with voltage-mode output driver in 90nm CMOS technology

A 5-Gb/s low-power transmitter having an output impedance calibration circuit and a voltage-mode output driver is implemented for high-speed serial link applications. The output impedance calibration circuit matches the output impedance of output driver to the characteristic impedance of the channel. This transmitter includes 32:1 serializer based on voltage-mode logic which operates successfully at 5-Gb/s. In addition, on-chip parallel PRBS7 (2
⁷
-1) generator is implemented for testing. The transmitter consumes 8.6mW with 300mVp-p output swing and occupies 60 μm × 70 μm of area.