By Bram Nauta

ISBN-10: 1461365910

ISBN-13: 9781461365914

ISBN-10: 1461535808

ISBN-13: 9781461535805

Integrated circuit know-how is regularly occurring for the entire integration of digital platforms. regularly, those platforms are discovered utilizing electronic options carried out in CMOS know-how. The low strength dissipation, excessive packing density, excessive noise immunity, ease of layout and the relative ease of scaling are the riding forces of CMOS know-how for electronic functions. components of those platforms can't be applied within the electronic area and should stay analog. with a view to in achieving entire process integration those analog services are ideally built-in within the related CMOS expertise. an immense type of analog circuits that must be built-in in CMOS are analog filters.
This ebook offers with very excessive frequency (VHF) filters, that are filters with cut-off frequencies starting from the low megahertz diversity to a number of 1000's of megahertz. till lately the maximal cut-off frequencies of CMOS filters have been restricted to the low megahertz diversity. by means of using the suggestions awarded during this publication the restrict might be driven into the genuine VHF area, and built-in VHF filters turn into possible. software of those VHF filters are available within the box of verbal exchange, instrumentation and regulate platforms. for instance, pre and submit filtering for high-speed advert and DA converters, sign reconstruction, sign deciphering, and so forth. the final layout philosophy utilized in this ebook is to permit in basic terms absolutely the minimal of sign sporting nodes in the course of the complete clear out.
This procedure begins on the clear out synthesis point and is prolonged to the extent of digital circuitry. the result's a clear out consciousness during which all capacitators (including parasitics) have a wanted functionality. the benefit of this method is that top frequency parasitic results (parasitic poles/zeros) are minimally current.
The e-book is a reference for engineers in learn or improvement, and is appropriate to be used as a textual content for complicated classes at the topic. >

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Additional resources for Analog CMOS Filters for Very High Frequencies

Example text

In some simple CMOS processes even no floating capacitors are available so that the circuit can not be realized. 7 without floating capacitors is given in reference [F-6]. However, this circuit is not suitable for high frequencies since it contains nodes with an undesired capacitor to ground. 3 State-space synthesis. 1 State-space synthesis. A method of formally describing the internal structure of filters is the state-space method [F-5], [1-6). The advantage of the state-space method is that it only requires grounded capacitors in the active realization.

6) have been multiplied with a factor Rx and all paths from 113 with a factor 1/Rx. The result is that the state variable 113 is converted to a voltage Vl3 . This is necessary since the integrator outputs (see fig. 3) in transconductance-C technique are voltages. The multiplication by Rx and 1/Rx have no effect on the transfer function from Vin to Vout . For an equally terminated LC ladder filter Rl is equal to Rs and usually Rx = Rl = Rs is chosen to obtain unity branch gains. Chapter 2 C3 /(C 4 +C 3 ) VC2/ i~ -1 ~ VC4 Cd(C2+ C3)/ R SL3 SR(C2 +C3) 1 1 -1 Fig.

The voltage VC3 across C3 is equal to the difference of V C2 and V C4 ' hence VC3 is not an independent state variable. 5) .. 5. The nodes in the upper half of the graph represent voltages and the nodes in the lower Chapter 2 19 half represent currents. VC2 VC4 -1 1 /~ -1 Rl 1 1 SC2 SL3 V -1 Fig. 4. The multiplication by s (differentiation) is caused by the feed forward path through Ca. Differentiators should be avoided because of noise and bandwidth grounds. Therefore the branch caused by Ca has to be eliminated without changing the transfer function from Vin to Vout .

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Analog CMOS Filters for Very High Frequencies by Bram Nauta


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