Title :
A constant input transconductance and rail-to-rail input/output swing SiC CMOS op amp
Author :
Chen, Jian-Song ; Kornegay, Kevin T.
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
A silicon carbide (SiC) CMOS op amp with a constant input transconductance and full input/output voltage swing is presented. A novel bias circuit is used to provide the bias current for both N-channel and P-channel differential pairs as a function of the input common mode voltage such that the total transconductance is virtually constant over the entire input common mode range. This scheme is also independent of transconductance parameter matching between the NMOS and PMOS transistors, thus resolving the process variation problem associated with new processes, which may be as high as 100% in the current SiC CMOS technology
Keywords :
CMOS analogue integrated circuits; differential amplifiers; linear network analysis; operational amplifiers; silicon compounds; wide band gap semiconductors; N-channel differential pairs; P-channel differential pairs; SiC; SiC CMOS opamp; bias circuit; constant input transconductance; input common mode voltage; rail-to-rail input/output swing op amp; transconductance parameter matching; CMOS process; CMOS technology; Circuits; MOS devices; MOSFETs; Operational amplifiers; Rail to rail inputs; Silicon carbide; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704322
