Clock producing apparatus for a PWM system digital to analog con

Details Clock producing apparatus for a PWM system digital to analog con Clock producing apparatus for a PWM system digital to analog con

1991-01-08

1993-09-14

Miska, Vit W.

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

84603, 331 51, 331 60, 341144, G04F 500, G10H 100

Patent

active

052455939

ABSTRACT:
A clock producing apparatus for a D/A converter switches the clocks in accordance with the inputted sampling frequencies. A deterioration in the S/N caused by unnecessary spectra which are caused by the inputting of different sampling frequencies is prevented.
The selecting operation is effected by the selecting circuit so as to obtain the selected input sampling frequencies, and at the same time, the clock signals are prevented from being inputted to the frequency dividing circuits corresponding to the input sampling frequencies which are not selected. Therefore, unnecessary spectra are prevented from being generated.

REFERENCES:
patent: 3927269 (1975-12-01), Yoshino et al.
patent: 4024786 (1977-05-01), Machamian
patent: 4611225 (1986-09-01), Powers
patent: 4701956 (1987-10-01), Katoh
patent: 4780772 (1988-10-01), Shibuya et al.
patent: 4970588 (1990-11-01), Kobayashi
patent: 5101369 (1992-03-01), Torii et al.

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