Title :
Blocking and desensitization in bipolar and MOSFET differential amplifiers
Author :
Abuelma´atti, Muhammad Taher
Author_Institution :
King Fahd Univ. of Pet. & Miner., Dhahran, Saudi Arabia
fDate :
11/1/1999 12:00:00 AM
Abstract :
Blocking and desensitization are among the nonlinear effects that result when bipolar and MOSFET differential amplifiers are operating in a multisignal electromagnetic interference (EMI) environment. When a weak desired signal is processed along with a strong undesired interferer signal, the weak signal may experience a reduced gain; that is, desensitization. If the amplitude of the undesired signal is sufficiently large, the gain of the desired signal may drop to zero; that is, blocking. Using a Fourier-series model for the differential input-voltage/output-current characteristics, closed-form expressions for predicting the desensitization in bipolar and MOSFET differential amplifiers are presented. These expressions are valid over a wide range of desired and blocking interfering signals amplitudes
Keywords :
Fourier series; MOSFET circuits; bipolar transistor circuits; differential amplifiers; electric current; electric potential; electromagnetic interference; semiconductor device models; Fourier-series model; MOSFET differential amplifier; bipolar differential amplifier; blocking; closed-form expressions; desensitization; differential input-voltage/output-current characteristics; electromagnetic interference; gain compression; multisignal EMI environment; nonlinear effects; signal gain; strong undesired interferer signal; undesired signal amplitude; weak desired signal; Curve fitting; Differential amplifiers; Electromagnetic interference; Input variables; MOSFET circuits; Polynomials; Power amplifiers; RF signals; Radiofrequency amplifiers; Signal processing;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
