Most op$-$amps operate with two de supply voltages, one positive and the other negative$\mathrm{.}2.$ An ideal op$-$amp has a finite bandwidth$\mathrm{.}3.$ A typical op$-$amp is made up of a differential amplifier, a voltage amplifier, and a push$-$pull amplifier$\mathrm{.}4.$ Common$-$mode rejection means that a signal appearing on both inputs is effectively cancelled$\mathrm{.}5.$ CMRR stands for common$-$mode rejection reference$\mathrm{.}6.$ Slew rate determines how fast the output can change in response to a step input$\mathrm{.}7.$ Open$-$loop voltage gain of an op$-$amp can range up to $1,000,000$ or more $(150$ dB$)\mathrm{.}8.$ Negative feedback reduces the bandwidth of an op$-$amp from its open$-$loop value$\mathrm{.}9.$ With no input signal, the output of an op$-$amp is ideally $0$ V and is called quiescent output voltage$\mathrm{.}10.$ The gain of a voltage$-$follower is very high$\mathrm{.}11.$ The closed$-$loop voltage gain is the voltage gain of an op$-$amp with external feedback$\mathrm{.}12.$ A compensated op$-$amp has a gain roll$-$off of $-20$dB decade above the critical frequency$\mathrm{.}13.$ The gain$-$bandwidth product equals the unity$-$gain frequency for a compensated op$-$amp$\mathrm{.}14.$ The voltage$-$follower is a special case of the inverting amplifier.