By Jim Williams, Bob Dobkin

* Covers the basics of linear/analog circuit and process layout to steer engineers with their layout challenges.

* in keeping with the appliance Notes of Linear expertise, the main fashion designer of excessive functionality analog items, readers will achieve useful insights into layout suggestions and practice.

* extensive variety of issues, together with strength administration tutorials, switching regulator layout, linear regulator layout, facts conversion, sign conditioning, and excessive frequency/RF layout.

* participants comprise the best lighting in analog layout, Robert Dobkin, Jim Williams and Carl Nelson, between others.

* on-line help package deal, together with LTspiceÒ software program, layout Notes, plus video clips and information sheets are available at

www.elsevierdirect.com/companions/9780123851857

Analog circuit and process layout at the present time is extra crucial than ever ahead of. With the expansion of electronic structures, instant communications, complicated business and automobile platforms, designers are challenged to boost refined analog recommendations. This accomplished resource ebook of circuit layout ideas will relief platforms designers with dependent and useful layout concepts that concentrate on universal circuit layout demanding situations. The book's in-depth program examples supply perception into circuit layout and alertness strategies so you might follow in today's hard designs.

* Covers the basics of linear/analog circuit and method layout to lead engineers with their layout challenges.

* according to the appliance Notes of Linear know-how, the main dressmaker of excessive functionality analog items, readers will achieve useful insights into layout innovations and practice.

* huge variety of themes, together with energy administration tutorials, switching regulator layout, linear regulator layout, info conversion, sign conditioning, and excessive frequency/RF layout.

* members contain the best lighting in analog layout, Robert Dobkin, Jim Williams and Carl Nelson, between others.

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Extra info for Analog Circuit Design: A Tutorial Guide to Applications and Solutions

Example text

A 1mF 24 tantalum output capacitor is suggested, as compared to 10mF for previous designs. Larger output capacitors can be used without fear of instabilities. The LT1121 is ideal for the backup and/or suspend mode power supply in notebook computers. A shutdown pin allows the regulator to be fully turned off, with input current dropping to only 16mA. Careful design of the IC circuitry connected to the input and output pins allows the output to be held high while the input is pulled to ground or reversed, without current flowing from the output back to the input.

The basic regulator has three different operating modes, defined by the mode pin drive. Normal operation occurs when the mode pin is grounded. A low quiescent current Burst Mode operation can be initiated by floating the mode pin. 3mA in this mode, and output ripple voltage is 100mVP-P. 5V forces the entire regulator into micropower shutdown where it typically draws less than 20mA. What are the benefits of using an active (synchronous) switch to replace the catch diode? This is the trendy thing to do, but calculations and actual breadboards show that the improvement in efficiency is only a few percent at best.

The diode string made up of diodes D2-D4 ensure that Q3 conducts all the regulator current when the wall unit is plugged in by separating the two gate voltages by about 2V. R14 acts as a current sense for the regulator. The regulator latches off at 3A when the voltage drop between the second Drain Sense Input, pin-8, and the supply, pin-6, rises above 100mV. R10 and C3 provide a short delay. The mP can restart the regulator by turning the second input, pin-5, off and then back on. 6V. The standby current for the 5V, 2A regulator is less than 10mA.

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