LSI with built-in clock generator-controller for operation with

Details LSI with built-in clock generator-controller for operation with LSI with built-in clock generator-controller for operation with

1995-09-25

1997-09-02

Pascal, Robert

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

395551, 395559, 39575001, 327156, 327159, 327161, 365227, 364707, 331 25, 331 1A, G06F 104, G06F 132

Patent

active

056636873

ABSTRACT:
The invention provides an LSI with a built-in clock generator-controller which minimizes power dissipation of an entire system and reduces production of a skew between an external system clock signal and an internal clock signal. The clock generator-controller includes a phase locked loop circuit formed from an input side divider for dividing an internal clock signal in response to a dividing signal, a phase comparator for comparing the phases of the clock signal divided by the divider and an external system clock signal with each other, a low-pass filter for converting a result of the comparison of the phase comparator into an analog voltage, a voltage controlled oscillator for outputting an oscillation signal having an oscillation frequency which is varied in response to the output signal of the low-pass filter, an output side divider for dividing the oscillation signal produced by the voltage controlled oscillator to produce an oscillation signal of a low frequency, a delay circuit for delaying the oscillation signal produced by the voltage controlled oscillator by a delay time equal to that of the oscillation signal divided by the output side divider, and a selector for selectively outputting, as the internal clock signal to be fed back to the input side divider, one of the low frequency oscillation signal divided by the output side divider and the oscillation signal delayed by the delay circuit in response to an operation condition signal.

REFERENCES:
patent: 5376848 (1994-12-01), Hanke, III et al.

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