Sensor Specifications: Analog-to-Digital Conversion Specifications: Sytem Noise:

Question

Sensor Specifications:

Analog-to-Digital Conversion Specifications:

Sytem Noise:

- There is signifigant noise at 20kHz during transmission between the amplifier and the A/D converter -->

The filter's cut-off frequency needs to be set at 1kHz above the highest frequency component of signal of interest.The passband gain needs to be 1.

Determine:

(1) Amplifier that should take upt he entire dynamic range of the A/D converter. Assume all operational amplifiers are ideal. Ensure loading doesn't happen. Hand-Drawn Schematic

(2) Design a filter to meet specifications set. Use the smalest oder filter possible. Minimize parts and include the transfer function H(omega) and a MATLAB plot.

(3) Determine the number of bits on the A/D converter and lowest possible sampling frequency.

(4) Assume the sampled input to the A/D converter is 3.58 volts. Determine the binary output.

Explanation / Answer

1) The number of possible states that the converter can output is:N = 2n

where n is the number of bits in the AD converter

Example: For a 3 bit A/D converter, N=23=8.

The maximum sampling frequency is the reciprocal of the conversion time

The filter's cut-off frequency = 1kHz

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