Question

Design the inverter circuit in Fig. 1.7 to provide VOH = 1.0 V, VOL = 50 mV, and so that the current drawn from the supply in the low-output state is 30 µA. The transistor has Vt = 0.35 V, μnCox = 540 µA/V2, and λ = 0. Specify the required values of VDD, RD, and W/L. How much power is drawn from the supply when the output is high? When the output is low?

Answer 1

To design the inverter circuit, adjust the biasing of the transistor using the drain resistor (RD) and the channel width-to-length ratio (W/L). Determine RD to achieve the specified low-output current. The drain current equation can be rearranged to solve for RD.

Step-by-step explanation:

To design the inverter circuit to meet the given specifications, we need to consider the high-level output voltage (VOH), low-level output voltage (VOL), and the current drawn in the low-output state.

The voltage levels can be achieved by adjusting the biasing of the transistor, which is controlled by the drain resistor (RD) and the channel width-to-length ratio (W/L) of the transistor. By adjusting these parameters, we can control the voltage levels at the output.

To achieve the specified low-output current, we need to determine the value of the drain resistor (RD). The drain current is given by ID = μnCox (W/L)(VGS - Vt), where VGS is the gate-source voltage. By rearranging the equation, we can solve for RD.