Smoothing filter for digital to analog conversion

Details Smoothing filter for digital to analog conversion Smoothing filter for digital to analog conversion

1980-01-25

1981-06-23

Gruber, Felix D.

Boots, shoes, and leggings

330109, 330290, 330294, 330306, 328167, H03H 1112, H04B 1500

Patent

active

042754534

ABSTRACT:
An electronic filter comprised of three active filter sections (A, B, C) is provided to smooth the stepped signal from a digital-to-analog converter. The first section has a noninverting low-pass filter transfer function, and the second has an inverting transfer function designed to pass a narrow frequency band centered at the step frequency of the stepped output signal with sharp cutoff on either side of that narrow band. The third section adds the noninverted output of the first section to the inverted output of the second section. This third section has a lead-lag transfer function designed to reduce the phase angle between the signal at its output terminal and the stepped signal at the input of the first section.

REFERENCES:
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patent: 4032857 (1977-06-01), Lum
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patent: 4189681 (1980-02-01), Lawson et al.
Melsheimer: If You Need Active Filters, Electronic Design, Apr. 12, 1967, pp. 78-82.
Tow: A Step By Step Active Filter Design, IEEE Spectrum, Dec. 1969, pp. 64-68.
Bainter: Active Filter Has Stable Notch and Response Can Be Regulated, Electronics, Oct. 2, 1975, pp. 115-117.
Sonderstrand et al: A Simple Filter Design Procedure, Int. Journal of Electronics, vol. 46, No. 1, 1979, pp. 19-32.

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