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Integrated Circuits

Design of Common Source Amplifier with Cadence Virtuoso

Introduction Amplifiers, one of the indispensable parts of analog electronics, are circuits that enable low power/amplitude analog input signal to come out of the output in an amplified state. In these circuits, the gain is shown as Av and defined as Av = Vout/Vin. Common Source (CS) Amplifier circuits can be designed relatively easier and smaller than other amplifier circuits, both in terms of size and design. What we need for this design is 1 MOSFET transistor and 1 load element (resistor, current source etc.). CS Amp. The main feature… Daha fazlasını oku »Design of Common Source Amplifier with Cadence Virtuoso

CMOS Inverter Design with Cadence Virtuoso

Definition Design Take the design parameters required for the design as shown below. In the first step of the design, we need the aspect ratio of the transistors. For this, we can start from the threshold voltage (Vth) of the CMOS Inverter, and in an ideal inverter gate, the threshold voltage is half of the supply voltage. After calculating the threshold voltage, we obtain the following equations by using the formula that gives the relationship between Vth and aspect ratio. Based on the calculations we made above, we can now… Daha fazlasını oku »CMOS Inverter Design with Cadence Virtuoso

MOSFET Operating Regions

NOTE: The images in the article are taken from Behzad Razavi’s “Design of Analog CMOS Integrated Circuits” Book. MOSFET type transistors consist of four terminals in total, namely gate, drain, source and body terminals. Unlike the base current of BJT transistors, MOSFETs have no gate current. There are two types of MOSFETs, N and P type. In N-type transistors, after the threshold voltage (Vth) is applied between the gate and source terminals of the transistor, the excess electrons in the N-doped region to which the source terminal is connected are… Daha fazlasını oku »MOSFET Operating Regions