Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1992-07-14
1995-08-08
Mottola, Steven
Amplifiers
Signal feedback
Phase shift means in loop path
330303, H03F 132, H03F 3191
Patent
active
054402700
ABSTRACT:
A switched capacitor lowpass filter is disclosed having four cascaded general purpose switched capacitor active filter blocks that combine with each other to produce a particular overall transfer function that has high gain selectivity and substantially linear phase response characteristics. The filter can also include a clock input which allows a user to select the cut-off frequency of the filter. The filter's characteristics are tailored in accordance with a method which: (1) introduces a notch frequency into the filter's gain characteristics, so as to improve the filter's gain selectivity near the cut-off frequency, and (2) linearizes the phase response characteristics of the overall filter, without modifying the magnitude of the gain of the notch-containing filter.
REFERENCES:
patent: 4257006 (1981-03-01), Schaumann
patent: 4417214 (1983-11-01), Sevastopoulos et al.
patent: 4593250 (1986-06-01), Lucas et al.
Analog Filter Design, by M. E. Van Valkenburg, Chapter 18: Delay Equalization, pp. 523-543; published by Halt, Rinehart & Winston; New York, 1982.
Passive and Active Network Analysis and Synthesis, by Aram Budak, pp. 448-455, 644-651 (Chapter 22); published by Houghton, Mifflin Co.; Boston, 1974.
Karantzalis Philip T.
Sevastopoulos Nello G.
DeHaemer Michael
Linear Technology Corporation
Mottola Steven
Rowland Mark D.
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