Question

6. a) You want to amplify an input signal with 10 mV amplitude and 50 MHz frequency. 

Which characteristics of op-amp will be significant in this case? What will be the 

value of these parameters? Why?

b) Design and draw a circuit using an op-amp to get + 8 V at output for input less than 

+4 V and -8 V at output for input greater than +4 V. 

Answer 1

To be given in question

Voltage (v)=10mv

Frequency (f)=50Hz

To be asked in question

(a) slew rate

(b) circuit design

We know that

(a) Slew rate (SR)= $\frac{dv}{dt}$

Slew rate :- output voltage change with respect to time this is called slew rate

Slew rate =$10\times10^{-3}\times50\times10^6 volt/sec$

SR =$5\times10^4meter/sec$

(b) when V_o=8volt

V$_{i}=<4volt$

Gain is $\beta=\frac{V_{o}}{V_{i}}$

$\beta>2$

$V_{0}=-8volt$

$V_{i}=4volt$

$\beta=\frac{-8}{4}=-2$

$\beta<2$

Condition follow