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Two stage Cascade BJT Amplifier

N K Kaphungkui

2015enbjtamplifiergainbandwidthelectronics

Abstract

Language:

This work presents the design and analysis of two stage BJT amplifiers aimed at achieving very small signal amplification. Utilizing a maximum supply voltage of 20V and an initial input signal of 6mV peak to peak, the first pre-amplifier stage processes a fraction of the input signal, resulting in an output signal of 11.25V peak to peak in the subsequent stage. The circuit demonstrates an impressive overall gain of 86538 times for the small signal at the input of the first stage. The performance optimization focuses on both the gain and bandwidth of the amplifier, particularly for small and low-frequency inputs. Analysis reveals that by varying the supply voltage (Vcc) from 7V to 20V, the amplifier achieves a maximum gain of 65.24dB without output distortion at the highest supply voltage, whereas a minimum gain of 31dB occurs at the lower threshold with the greatest bandwidth. Moreover, the output noise voltage range is noted to increase as supply voltage rises, from 1.6uV/Hz1/2 to 270uV/Hz1/2. This analysis demonstrates the cascading approach effectiveness in amplifying weak signals while addressing input and output impedance matching challenges.

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Cite This Work

@article{01dbd261-8c58-40f4-8a1b-63343d0e6a0a,
  title={Two stage Cascade BJT Amplifier},
  author={N K Kaphungkui},
  year={2015},
  language={en}
}
TY  - JOUR
TI  - Two stage Cascade BJT Amplifier
AU  - N K Kaphungkui
PY  - 2015
LA  - en
ER  -

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