# DSP Quantisation

1. An analogue signal is to be sampled from a transducer with an output voltage range of 0 to 10 volts and operating on a 12-volt power supply. The designer has available two analogue to digital converters (ADC): a 3 bit ADC and a 4 bit ADC. For each converter:

(a) Supply the quantisation levels (including zero) that are available. Do this for both the three and 4-bit ADC in table form.

(b) What is the resolution of each quantizer?

(c) What is the maximum quantisation error?

https://brainmass.com/engineering/electrical-engineering/dsp-quantisation-levels-23049

#### Solution Preview

(a)

quantisation levels: (assuming a linear ADC)

3-bit ADC: 2^3 = 8 levels (level 0 to 7); divide 10V by (8-1=) 7 since 0 V represents level 0 and 10 V represents level 7.

Bits

2 1 0 QU. Level(V)

- - - ------------

0 0 0 0.0

0 0 1 1.43

0 1 0 2.86

0 1 1 4.29

1 0 0 5.71

1 0 1 7.14

1 1 0 8.57

1 1 1 10.0

4-bit ADC: 2^4 = 16 levels (level 0 to ...

#### Solution Summary

The solution gives clear steps to finding the quantisation levels (three and 4-bit ADC in table form), resolution of each quantizer and maximum value of the quantisation error for the analogue-to-digital converter described.