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U. Glaeser

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FIGURE 3.19 4:1 multiplexer block diagram and output eye diagram.<br />

FIGURE 3.20 1:4 demultiplexer block diagram and output eye diagram.<br />

at 0°C, 0.28 V at 50°C, and 0.24 V at 125°C. Bipolar transistors in the third level enter the soft saturation<br />

region above 75°C.<br />

If minimum |V EE| is 2.2 V, V CS can be 0.4 V and a bipolar current source circuit can be used instead<br />

of the resistor to provide much higher immunity to variations in supply voltage and temperature. SPICE<br />

simulation indicates tolerance to a ±10% variations in supply voltage can be obtained and the output<br />

voltage swing is 0.3 V over the range of 0–125°C.<br />

© 2002 by CRC Press LLC

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