Optimized Desigin of Transistor Amplifier Circuit Based on Multisim

• 1、Electronics and Information Engineering School,Liaoning Technical University,Huludao,125105

Abstract：To address the challenges of temperature drift, noise suppression, and bandwidth expansion in transistor amplifier circuits, this paper proposes an optimization design method based on Multisim. By combining dynamic biasing technology with constant-current source loads, the stability of the quiescent operating point is improved. The common-emitter-common-base cascaded structure and shared constant-current source biasing technology are adopted to achieve high gain and wide-frequency characteristics. The complementary push-pull output stage compensates for temperature effects through dynamic biasing to suppress crossover distortion. Multisim simulation verification shows that the optimized circuit exhibits a gain fluctuation of <5% in the temperature range of -40 C to 85 C, a gain-bandwidth product of 5.2 MHz, a slew rate of 32 V/μs, and a noise figure below 2 dB, meeting the high-precision sensing requirements of industrial IoT. This study provides new insights for multi-parameter coupling optimization in analog circuit design.

Keywords： Transistor amplifier circuit Dynamic biasing Multisim simulation Noise suppression