Q1 (a) What does the abbreviation DAC stand for, and what is the purpose of this component? [2] (b) Sketch the circuit for a basic 6 bit, linear output DAC that employs a single opamp. You should indicate what makes this circuit have a linear output. [6] (c) What changes would you make to this circuit to give it a non-linear output and why might a non-linear output be desirable? [4] Describe two undesirable features of the output signals from a DAC. You can use examples that result from errors or are intrinsically part of a DACs output even if is working perfectly. [4] What can we do to prevent the errors or avoid any problems associated with the features you described in (d) above? [4]