Schmitt Trigger
Overview The Schmitt Trigger is a logic input type that provides hysteresis or two different threshold voltage levels for rising and falling edge. This is useful because it can avoid…
Circuit Pitfalls
Outline • Circuit Pitfalls – Detective puzzle – Given circuit and symptom, diagnose cause and recommend solution – All these pitfalls have caused failures in real chips • Noise Budgets…
Domino Logic
Tinkering with Logic Gates Things to like about CMOS gates: easy to translate logic to fets rail-to-rail switching good noise margins, no static power since fets are in cutoff sizing…
Transmission Gates
Introduction A Transmission Gate (T-gate or TG or pass gate) is a bi-directional switch made up of an NMOS and PMOS in parallel. A control signal is connected to the gate…
Pass-Transistor Logic
• N transistors • No static consumption Primary inputs drive the gate terminals + source-drain terminals. In contrast to static CMOS – primary inputs drive gate terminals. Example: AND Gate When…
Dynamic Circuits
Introduction to Dynamic Gates Static logic is great for its robustness. However, it is too slow to meet requirements for high speed processor critical paths. Thus, designers are increasingly turning…
Ratioed Logic Circuit
Ratioed MOS circuits have been known for many years, and were used widely in the past despite their high power dissipation because they are fast static circuits. Ratioed circuits use…
Static CMOS Logic
The principle of static CMOS logic is shown in Fig. A.13(a): the output is connected to ground through an n-block and to through a dual p-block (the gate in Fig. A.8 is also an…
Scaling
Reducing the channel length of a MOSFET can be described in terms of scaling theory. A scaling parameter S (S < 1) is used to scale the dimensions of a…
Linear delay model
Linear delay model in VLSI This post tells about logical effort and parasitic delay in linear delay model in VLSI. As was shown before delay linearly depends on the fan-out of the…
