Title :
Radio frequency interference by demodulation mechanisms present in bipolar operational amplifiers
Author :
Abuelma´atti, Muhammad Taher
Author_Institution :
King Fahd Univ. of Pet. & Miner., Dhahran
fDate :
5/1/1995 12:00:00 AM
Abstract :
A model is proposed for the input-voltage/output-voltage characteristics of bipolar active loaded common-emitter and differential pair amplifiers. Using this model, closed-form expressions are derived for the harmonic and intermodulation products resulting from a multisinusoidal excitation. Using these expressions, the radio frequency interference (RFI) demodulation in bipolar operational amplifiers, using active loaded common-emitter and differential pair amplifiers can be predicted. The results show that the finite values of the early voltages in active loaded amplifiers play an important role in deciding the RFI demodulation performance of bipolar operational amplifiers
Keywords :
bipolar analogue integrated circuits; demodulation; differential amplifiers; integrated circuit noise; intermodulation distortion; operational amplifiers; radiofrequency amplifiers; radiofrequency interference; active loaded common-emitter amplifiers; bipolar operational amplifiers; closed-form expressions; demodulation mechanisms; differential pair amplifiers; harmonic products; input-voltage; intermodulation products; model; multisinusoidal excitation; output-voltage; radio frequency interference; Chirp modulation; Circuits; Delta modulation; Demodulation; Differential amplifiers; Operational amplifiers; Radiofrequency amplifiers; Radiofrequency interference; Voltage; Wire;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
