G. Ahn et al., A 2-Gbaud 0.7-V swing voltage-mode driver and on-chip terminator for high-speed NRZ data transmission, IEEE J SOLI, 35(6), 2000, pp. 915-918
A large-swing, voltage-mode driver and an on-chip termination circuit are p
resented for high-speed nonreturn-to-zero (NRZ) data transmission through a
copper cable. The proposed driver with active pull-up and pull-down can ge
nerate a 700-mV signal to deliver a 2-Gbaud serial NRZ data stream. Low out
put impedance offered by simple negative-feedback resistors alleviates the
detrimental effect of the parasitic capacitance by supplying fast curl ent
impulses. A proposed on-chip termination circuit provides termination imped
ance to a mid-supply termination voltage with the benefit of reduced parasi
tic capacitance and better termination characteristics compared with off-ch
ip termination. The driver and termination circuits have been incorporated
in a 2-Gbaud transceiver chip and fabricated in 0.35-mu m CMOS technology.
Measurements show a 1.4-V differential swing with a slew rate of 2.5 V/ns a
t the receiver output and a 65% reduction of reflection by the on-chip term
ination circuit with power consumption of 191 mW at 3.3-V supply.