Circuits for electronic instrumentation by Thomas Henry O'Dell

By Thomas Henry O'Dell

This booklet is an updated textual content on digital circuit layout for those who prefer to research electronics by way of construction circuits and making measurements. the topic is handled from an experimental standpoint, yet this has now not constrained the writer to famous or basic circuits. certainly, a few very contemporary and relatively complex circuit rules are recommend. each one bankruptcy takes up a specific kind of circuit, after which leads the reader to achieve an knowing of ways those circuits paintings by way of providing experimental circuits for the reader to construct and degree. Examples mentioned comprise step restoration circuits of the digitizing oscilloscope, sampling gate and quick comparator circuits, probe and enter circuits, wide-band amplifier and waveform-generating circuits, and switched capacitor, part locked loop, and occasional noise circuits
Circuits for digital instrumentation -- Sampling pulse generator circuits -- pattern and carry circuits -- Comparator circuits -- Probes and enter circuits -- Wide-band amplifier circuits -- Waveform generator circuits -- Switched capacitor circuits -- part locked loop circuits -- Low noise circuits -- References -- Index

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At the other end of the line, because of the large inductance of the winding, which is common to both inner and outer conductors, the connections may be reversed: the inner conductor may be grounded while the outer conductor used as the source of a pulse, identical to the input pulse but of opposite sign. This kind of transformer has been known for a very long time [10]. The simplest way to make a balun transmission line transformer is to take two of the inverting transformers, that have been described above, and connect their inputs in parallel on one side and in series on the other.

4) shows that Vout is, as expected, a sine wave with the same frequency, co, as the input sine wave, but transformed to the much slower time scale, /'. What is of primary interest, however, is the amplitude of this Vout. 5) where / = co/2n has been substituted for convenience. 5) shows that the sample and hold circuit, shown in Fig. 1, has the frequency response shown in Fig. 2, when it is operating with Tin > r, and t' is changing very slowly. There will be an opportunity, later in this chapter, to check this experimentally.

The simplest way to make a balun transmission line transformer is to take two of the inverting transformers, that have been described above, and connect their inputs in parallel on one side and in series on the other. For example, 100 Q co-axial cable could be used to provide a 50 Q to 200 Q balun transformer of this kind. Using 100 Q twisted pair, or balanced line, would be even better. This method of constructing a balun may have been first described by Talkin and Cuneo in 1957 [11] and a paper [12] has reviewed developments in technique, although it does not mention an important contribution by Hilberg [13], who deals with the problems that can arise when transformers are made to operate in both the transmission line mode and the conventional coil mode, simultaneously.

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