Digital Technology Options Standard

 

Topic #	Old Topic	Old # Hrs	New Topic #	New Topic	New # Hrs
			C	Digital Technology	15
			C1	Analogue and digital signals	4
			C2	Data capture; digital imaging using charge-coupled devices (CCDs)	4
			C3	Electronics	5
			C.3.1	State the properties of an ideal operational amplifier (op-amp).
			C.3.2	Draw circuit diagrams for both inverting and non-inverting amplifiers (with a single input) incorporating operational amplifiers.
			C.3.3	Derive an expression for the gain of an inverting amplifier and for a noninverting amplifier. Students should be aware of the virtual earth approximation.
			C.3.4	Describe the use of an operational amplifier circuit as a comparator. Students will be expected to draw appropriate circuits. Output devices for comparator circuits may include light-emitting diodes (LEDs) and buzzers.
			C.3.5	Describe the use of a Schmitt trigger for the reshaping of digital pulses.
			C.3.6	Solve problems involving circuits incorporating operational amplifiers.
			C4	The mobile phone system	2
			C.4.1	State that any area is divided into a number of cells (each with its own base station) to which is allocated a range of frequencies. Students should know that frequencies are allocated so as to avoid overlap between cells.
			C.4.2	Describe the role of the cellular exchange and the public switched telephone network (PSTN) in communications using mobile phones. The role of the cellular exchange in the selection and monitoring of base stations and the allocation of channels should be understood.
			C.4.3	Discuss the use of mobile phones in multimedia communication.
			C.4.4	Discuss the moral, ethical, economic, environmental and international issues arising from the use of mobile phones