Title :
A fully differential CMOS line driver for ISDN
Author :
Tomasini, Luciano ; Gola, Alberto ; Castello, Rinaldo
Author_Institution :
ST SGS-Thomson Microelectron., Milan, Italy
fDate :
4/1/1990 12:00:00 AM
Abstract :
A CMOS differential buffer amplifier for ISDN applications is discussed. The chip operates from a single 5-V power supply and can deliver a 6-V (peak-to-peak), 80 kHz signal into a load of 100 Ω and/or 300 pF with a total harmonic distortion (THD) of about 0.25%. The amplifier´s main feature is its power supply rejection ratio, which remains practically constant at -75 dB from DC to several hundred kilohertz for both positive and negative supplies with the common-mode voltage generated on chip. In an inverting configuration with a gain of 1.5, the 1% setting time for step input is less than 500 ns for a step of 1.5 V and less than 1 μs for a step of 6 V (for both cases, the output load is 100 Ω and 300 pF). By using relatively small devices for the output stage, the amplifier occupies an area of only 1400 mil2 in a 2-μm double-poly single-metal n-well CMOS technology
Keywords :
CMOS integrated circuits; ISDN; buffer circuits; differential amplifiers; driver circuits; linear integrated circuits; telecommunication equipment; 2 micron; 5 V; 6 V; 80 kHz; CMOS line driver; ISDN; differential buffer amplifier; double polysilicon single metal technology; inverting configuration; n-well CMOS technology; power supply rejection ratio; single 5-V power supply; CMOS technology; DC generators; Differential amplifiers; Driver circuits; ISDN; Power amplifiers; Power generation; Power supplies; Total harmonic distortion; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
