(a(i))[1]
State the meaning of infinite bandwidth.
(a(ii))[1]
State the meaning of zero output impedance.
(b(i))[2]
The circuit of a non-inverting amplifier that uses an ideal op-amp is shown in Fig. 7.1. The light-emitting diode (LED) gives out light when the potential difference across it is at least $2.0\,\text{V}$. The current in the LED must not exceed $20\,\text{mA}$. Calculate the gain of the amplifier circuit.
(b(ii))[1]
Determine the value of $V_{IN}$ when the value of $V_{OUT}$ is $+2.0\,\text{V}$.
(b(iii))[1]
State the maximum output potential $V_{OUT}$.
(b(iv))[2]
When the op-amp is saturated, the potential difference across the LED is $2.2\,\text{V}$. Calculate the minimum resistance of resistor $R$ so that the current in the LED is limited to $20\,\text{mA}$.