CIRCUIT AND METHOD FOR DETERMINING THE RATIO BETWEEN TWO FREQUENCIES

摘要: Determining the ratio between two frequencies can be a useful electronic building block in different circuits with very divers functionalities. The invention comprises circuit for determining frequency first input signal having and second frequency, wherein comprises: controlled fractional divider arranged generating divided being substantially by control signal; phase detector difference based on of loop filter is formed divider, signal, detector, filters such that instability prevented; preferably magnitude indicative ratio.