Ic Works, Inc.

John Eric Ruetz

A phase frequency detection circuit and method in a phase lock loop circuit uses delay circuits to limit the period of expression of up and down signals which adjust the output frequency of a voltage controlled oscillator. The pulse frequency detection circuit includes cross-linked latches to drive logic gates which produce output signals for adjusting the output frequency of a voltage controlled oscillator and delay circuitry connected to the outputs of particular logic gates for selective nullification of up and down control signals to a voltage controlled oscillator.

Slow transition time phase frequency detector and method

A voltage controlled oscillator circuit includes a predetermined number of interconnected differential comparator cells having source connected p-channel and n-channel transistors, a biasing transistor connected to the sources of the p-channel or n-channel transistors, and clamping circuits connected to said first and second n-channel transistors. The voltage controlled oscillator circuit further includes filter circuitry for filtering the input currents to the biasing transistor.

Growing community of inventors

San Bruno, CA, United States of America

John Eric Ruetz