Title :
High speed buffers for op-amp characterization
Author :
Rangan, Giri ; Kenney, John G. ; Ramamurthy, Karthik ; Temes, Gabor
Author_Institution :
Dept. of Electr. & Comput. Eng., Oregon State Univ., Corvallis, OR, USA
Abstract :
Techniques for testing the frequency response of an operational amplifier (op-amp) sometimes require a buffer in the feedback path. This buffer is needed to prevent an inadvertent forward signal path from the input of the op-amp to the output of the op-amp through the feedback circuitry. The buffer must have very good linearity and a higher bandwidth than the op-amp under test. Three CMOS buffer designs are presented. Simulation results show total harmonic distortion of about 1% at frequencies as high as 10 MHz into a load capacitance at 5 pF. The buffers settle to within 1% of the final voltage in fewer than 20 ns
Keywords :
CMOS analogue integrated circuits; buffer circuits; feedback amplifiers; frequency response; harmonic distortion; operational amplifiers; 10 MHz; 20 ns; 5 pF; CMOS buffer designs; feedback path; forward signal path; frequency response; high speed buffers; linearity; load capacitance; op-amp characterization; settling time; total harmonic distortion; Bandwidth; Capacitance; Circuit simulation; Circuit testing; Feedback circuits; Frequency response; Linearity; Operational amplifiers; Output feedback; Total harmonic distortion;
Conference_Titel :
Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-1281-3
DOI :
10.1109/ISCAS.1993.393891
