- (b) A yoltage signal x(t) from an earth quake is captured by a sensor and passed through an active highpass filter system for processing. (i) Sketch the circuit diagram for the process. (ii) Derive an expression for the transfer function of the system. (iii) Find the values of the circuit components required to produce an output of 5V if an input of 20OmV is applied and the cut-off frequency is 2.5kHz. (iv) If an input voltage of 2V is applied to the filter system, write an expression for this input in terms of unit step function and find the output y(t) of the system. To minimize the calculation, assume all the circuit components. in the transfer function equation have unity values. [2 mrks] [5 marks] [6 marks] [6 marks]