Question

Project Description

The objective of this project is to design, simulate and build a speech filter. The design should operate on less that ±6 Volts DC. Please keep in mind that you should monitor the cost of the design components. Therefore you will need to determine the frequency band of speech and investigate low power options for the design. After reviewing the various tradeoffs which happens after design and simulations, you should then order the parts for the actual design. Your design must include simulations (Matlab, Multisim or other simulation tools) as well as power and frequency analysis. Make sure your input signal has the various frequency ranges that demonstrates that your design works. You must also compare the actual simulation results to the actual results and explain any differences.

Your circuit should address the following:

1. Demonstrate the speech filter response of the design. Use a LM358N Op amp. The frequencies are 300Hz low end and 3.3KHz high end.
2. Power analysis of the design
3. What could you have done differently to make the circuit more efficient whether its cost, performance or simply a different design implementation?

Answer 1

The Active bandpass filter designed and simulated in Multisim with the LM358N op-amp

The maximum voltage gain of the filter is (R2/R1)=1

voltage gain for the designed circuit is calculated for various frequency and plotted against the frequency

OP-AMP LM385N has more advantages

1.wide power supply range +-1.5V to +-16V(Dual power supply), and also it can be operated in single power supply (3V-32V)mode

2. Internally Frequency Compensated for Unity Gain

The entire circuit is construcetd by using minimal low cost components.