Download PDF by Dr.-Ing. Ulrich Tietze, Dr.-Ing. Christoph Schenk (auth.): Advanced Electronic Circuits

By Dr.-Ing. Ulrich Tietze, Dr.-Ing. Christoph Schenk (auth.)

ISBN-10: 3642812414

ISBN-13: 9783642812415

ISBN-10: 3642812430

ISBN-13: 9783642812439

In the sooner phases of built-in circuit layout, analog circuits consisted easily of variety 741 operational amplifiers, and electronic circuits of 7400-type gates. cutting-edge designers needs to make a choice from a far better and quickly expanding number of distinctive built-in circuits advertised through a dynamic and artistic undefined. simply via a formal choice from this wide variety can a cheap and aggressive resolution be discovered to a given challenge. for every person case the clothier needs to make a decision which elements of a circuit are most sensible carried out by means of analog circuitry, which via traditional electronic circuitry and which sections should be microprocessor managed. on the way to facilitate this determination for the clothier who's no longer acquainted with these types of matters, now we have prepared the ebook as a way to staff the various circuits in response to their box of program. every one bankruptcy is hence written to face by itself, with at least cross-references. To let the reader to continue fast from an concept to a operating circuit, we speak about, for a wide number of difficulties, usual strategies, the applicability of which has been proved via thorough experimental research. Our thank you are the following because of Prof. Dr. D. Seitzer for the availability of fine laboratory amenities. the topic is large and the cloth provided has needed to be constrained. hence, we've got passed over ordinary circuit layout, in order that the publication addresses the complex scholar who has a few again­ floor in electronics, and the practicing engineer and scientist.

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24 Temperature compensated exponential function network. As with the logarithmic amplifier in Fig. 22, the temperature stability can be improved by using a differential amplifier. The appropriate circuit is represented in Fig. 24. Again, from Eq. 29) From Fig. 24 we deduce the following equations I - Uref cz- R ' z By substitution we obtain the output voltage U R ~.!!..!... Uo=~eR3+R4 Rz UT. It can be seen that I ES no longer appears in the result if the transistors are well matched. The resistor R5limits the current through the transistors Tl and T z , and its resistance does not affect the result as long as the operational amplifier OA 2 is not saturated.

A multiplier can be employed as a square-rooter if operated as a squarer and inserted in the feedback loop of an operational amplifier, as shown in Fig. 47. The output voltage finds a level such that U2 -t=~, hence Uo=VEUi • Correct operation is ensured only for positive input and output voltages. g. at switching on. In such a case, the squarer causes a phase ·inversion in the feedback loop so that a positive feedback arises, and the output voltage becomes more negative until it reaches the negative level of output saturation.

37) This function can be interpreted as approximating the sine function The quality of the sine approximation is dependtlllt on the peak value q chosen. 86I E R 2 • The value of the absolute error remains below 3 %of the amplitude, and is greatest at the peak values. 3 % to approx. 4 %. Linear and non-linear operational circuitry 30 Cosine function The cosine function can be formed for values 0;;;; x ;;;; 1t by means of the sine function networks previously described. The input voltage U;, which should lie between zero and u;max, is converted to an auxiliary voltage U1 = u;max-2u;.

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Advanced Electronic Circuits by Dr.-Ing. Ulrich Tietze, Dr.-Ing. Christoph Schenk (auth.)


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