Erratum: Simple low-cost correlator and multiplier circuits

2 NOSSEK, j . A.: 'Improved circuit for switched-capacitor simulation of an inductor', ibid., 1980, 16, pp. 141-142 3 NOSSEK, J. A., and TEMES, G. C : 'Switched-capacitor filter design using bilinear element modelling', IEEE Trans., 1980, CAS-27, pp. 481-491 4 SPAHLINGER, G. : 'Switched-capacitor simulated inductors', AEU, 1981,35, pp. 53-55 5 LEE, M. s.: 'Switched-capacitor filters using floating inductance simulation circuits', Electron. Lett., 1979, 15, pp. 644-645 6 LEE, M. s.: 'Improved circuit elements for switched-capacitor ladder filters', ibid., 1980, 16, pp. 131-133 7 LEE, M. s., and CHANG, c.: 'Low sensitivity switched-capacitor ladder filters', IEEE Trans., 1980, CAS-27, pp. 475^80

ERRATA

8 LEE, M. s., and CHANG, C. : 'Switched-capacitor filters using the LDI and bilinear transformations', ibid., 1981, CAS-28, pp. 265-270 9

V1SWANATHAN,

T. R., F A R U Q U E , S. M., S I N G H A L , K., a n d

'Switched-capacitor transconductance blocks', ibid., 1980, CAS-27, pp. 502-508 10 FARUQUE, s. M., VLACH, J., and

and

VLACH,

related

J.:

building

VISWANATHAN, T. R.: 'Switched-

capacitor inductors and their use in LC filter simulation', IEE Proc. G, Electron. Circuits & Syst., 1981, 128, (4), pp. 227-229

0013-5194/83/010029-02$1.50/0 The sentence starting four lines above eqn. 1 should read: Winograd applied a theorem due to Rader5 to use these convolutions to perform DFTs.

Printer's corrections

GLEN, p. j . : 'Simple low-cost correlator and multiplier circuits', Electron. Lett., 1982, 18, (21), pp. 914-915 Fig. 3 was printed showing the inverting input of the amplifier connected to the noninverting input. It should be replaced by the following:

BROMBA, M. u. A., and ZIEGLER, H. : 'Further results on maximally flat nonrecursive digital filters', Electron. Lett., 1982, 18, (23), pp. 1014-1015

fN\ In eqn. 18,

(N I should read

\MJ A(t)

C(t) DC

\m

The author would like to make the following correction: In eqn. 7, xN should read xM Author's correction MATTRICIANI, E.: 'Effects

of filtering on statistics of raininduced fade durations', Electron. Lett., 1982, 18, (6), pp. 253255 The author would like to replace the sentence above Fig. 2 with the following: B(t)

WARD, j . s., and STANIER, B. J.: 'Implementation of convolution and Fourier transforms using 1-bit systolic arrays', Electron. Lett., 1982, 18, (18), pp. 799-801

30

The conditional standard deviation curves expressed in units of time (i.e. 1 s and 4 s), not shown, resemble each other and the average curves, but they are reversed with a ratio close to 2. When the 4 s ST curve is denormalised and expressed in seconds, the 4 s ST conditional standard deviation is almost twice the 1 s ST one.

ELECTRONICS LETTERS 6th January 1983

Vol. 19

No. 1