By Frank op 't Eynde, Willy M.C. Sansen

It is a smart honor to supply an creation for Dr. Frank Op 't Eynde's and Dr. Willy Sansen's ebook "Analog Interfaces for electronic sign Processing Systems". the sector of analog built-in circuit layout is present process quick evolution. The pervasiveness of electronic processing has significantly converted the micro-system architectures: the analog a part of complicated combined platforms is progressively more driven on the boundary limits of the processing chain. in addition, the elevated functionality of electronic circuits, when it comes to accuracy and velocity, are making the specification specifications of analog circuits very strict. as well as this, the know-how, offer voltage and tool intake of analog circuits needs to be suitable with these, average for electronic circuits. for this reason, in a number of phrases, analog circuits have gotten advanced and specialized interfaces among the genuine global and electronic sign processing domain names. This technological evolution could be observed through an equivalently quickly evolution in dressmaker abilities. wisdom of complex sign dealing with will be speedy changed by means of information of straightforward yet very actual and intensely speedy sign processing and an outstanding historical past in info conversion strategies. All of this by utilizing the CMOS (and probably BiCMOS) technology.

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Extra resources for Analog Interfaces for Digital Signal Processing Systems

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8. were derived for six different amplifier types in a 3 ~m CMOS technology. For CMOS processes with a shorter channel length, these curves shift to higher frequencies. Fig. 2 ~m CMOS technology. 5 GHz. The operational amplifier of Fig. 14, which is a differential version of the "Modified Folded-Cascode" schematic of Fig. d, is implemented in this technology [20]. M s ' in Fig. ). Since the phase shift due to this pole-zero pair is avoided, a larger phase shift due to the second pole can be tolerated.

6. a) The test amplifier with a heavy load and a Supply impedance b) The measured harmonic distortion 100000 Low -DISTOR nON CMOS - 58- AMPLIFIER DESIGN Since the input impedance of the source follower in Fig. a. is very high, both circuits have the same load. For frequencies up to lO kHz, the second harmonic distortion is over 15 dB worse for the circuit of Fig. b. This is due to the varying power supply voltage, since this is the only difference between the two circuits. This illustrates the importance of the power supply gain.

B. is preferable over the complementary circuit. For a second pole at higher frequencies, a complementary realisation with pMOS input amplifiers requires less power. For a second pole beyond 200 MHz, the power consumption starts to grow very quickly. This illustrates that due to technological limitations, a GBW higher than about 50 MHz is not feasible for this amplifier type in this technology. 23) expresses the supply current for the optimised design. In reality, other considerations such as noise performance, input common mode range or output swing can result in a design which is not optimum in terms of power consumption.

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