1. Gregorian, R., and Temes, G.A.: Analog MOS integrated circuits—for signal processing, (Wiley, New York 1986), p. 79
2. Allen, P.E., and Holberg, D.R.: CMOS analog circuit design, (Holt, Rinehart and Winston, Inc. 1987), p. 327–349
3. Oppenheim, A.V., and Schafer, R.W.: Discrete-time signal processing, (Prentice-Hall 1989), p. 254–266