Page 130 - DCAP108_DIGITAL_CIRCUITS_AND_LOGIC_DESIGNS

Unit 7: Standard Integrated Circuits (ICs)

About MEMS Pro Notes
MEMS Pro is a tool suite from SoftMEMS LLC for designing and analyzing MEMS. Its
integration with Tanner and other tool suites shortens development time and provides
designers reliable analysis for manufacture.

The MEMS Pro suite offers mixed MEMS/IC schematic capture and simulation, full custom
mask layout capability and verification, 3D model generation and visualization, behavioural
model creation, and links to 3D analysis packages.
SoftMEMS was founded in 2004 by Dr. Mary Ann Maher. The company’s products are based
on the MEMS Pro software developed by Dr. Maher’s team at Tanner Research in 1997 and the
MEMS Xplorer software developed by Dr. Jean Michel Karam’s teams at TIMA and MEMSCAP.
Questions:

1. What is the process of detecting acceleration and motion?
2. Explain the inertial sensors.

Self Assessment

True or False:
6. NMOS circuits are slow to transition from low to high.
(a) True (b) False
7. Current draw of CMOS devices increases with clock speed.
(a) True (b) False
Multiple choice questions:
8. Positive emitter-coupled logic (PECL) is a further development of ECL using a positive 5V
supply.
(a) 4V (b) 10V
(c) 11V (d) 5V

9. In NMOS the DC current must flow through a logic gate even when the output is in a steady
state.
(a) steady state (b) dynamic state
(c) both (a) and (b) (d) None of these
10. The number of input combinations for a 3-input gate is:
(a) 4 (b) 6
(c) 5 (d) 8

7.8 Summary

• ICs have become the principal components of almost all electronic devices. These miniature
circuits have demonstrated low cost, high reliability, low power requirements, and high
processing speeds compared to the vacuum tubes and transistors.
• The fan-out of a gate is limited by the current that its output can supply to the gate inputs
connected to it when the output is at logic ‘1’, since at this state it must be able to drive the
connected input transistors into saturation.
• CMOS is the other major technology utilized in manufacturing digital IC’s aside from TTL,
and is now widely used in microprocessors, memories, and digital ASIC’s.

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