## Design a circuit to provide 60 W at 50 V to a resistive lamp from an AC supply of 120 V ± 10% at…

Design a circuit to provide 60 W at 50 V to a resistive lamp from an AC supply of 120 V ±  10% at 60 Hz. The circuit should be energy efficient—that is, it should consume the least power possible.

## Design a circuit to charge a 2-µF capacitor from a DC supply of 24 V. The charging current should…

Design a circuit to charge a 2-µF capacitor from a DC supply of 24 V. The charging current should be limited to 1 mA. The accuracy should be better than 5%.

## The input and output voltages of an amplifier are Find the magnitude and phase of the voltage…

The input and output voltages of an amplifier are Find the magnitude and phase of the voltage gain of the amplifier.

## An n-channel MOSFET has K p 20 mA/V 2 and V t = 1.5 V. If the gate–source voltage is V GS = 3 V,…

An n-channel MOSFET has Kp 20 mA/V2 and Vt = 1.5 V. If the gate–source voltage is VGS = 3 V, find the small-signal transconductance gm of the MOSFET.

## An n-channel JFET has I DSS = 20 mA and V p = 23 V. If the gate–source voltage is V GS = -1.5 V,…

An n-channel JFET has IDSS= 20 mA and Vp = 23 V. If the gate–source voltage is VGS = -1.5 V, find the small-signal transconductance gm of the JFET. Assume the devices are in saturation.

## The base current of a bipolar transistor is i B 2 (1 + sin 2000 πt) mA and the current gain of…

The base current of a bipolar transistor is iB 2 (1 + sin 2000 πt) mA and the current gain of the transistor is βF 100. What are IB, ib, IC, and ic?

## For a bipolar transistor, the collector–emitter voltages are V CE 6 V and v ce = – 100 sin (2000…

For a bipolar transistor, the collector–emitter voltages are VCE 6 V and vce = – 100 sin (2000 πt) mV, and the base–emitter voltages are VBE = 0.7 V and vbe = 1 sin (2000 πt) mV.  a. What are the expressions for vCE and vBE? b. Find the small-signal voltage gain Av.

## For an FET, the drain–source voltages are V DS 6 V and v ds = – 50 sin (1000 πt) mV, and the…

For an FET, the drain–source voltages are VDS 6 V and vds = – 50 sin (1000 πt) mV, and the gate–source voltages are VGS =  3 V and vgs 2 sin (1000πt) mV. a. What are the expressions for vDS and vGS? b. Find the small-signal voltage gain Av.

## What is the purpose of DC biasing of an amplifier?

What is the purpose of DC biasing of an amplifier?

## What is the effect of rise time on the frequency response of an amplifier?

What is the effect of rise time on the frequency response of an amplifier?