METHOD FOR GENERATING A PLURALITY OF OSCILLATING SIGNALS WITH DIFFERENT PHASES AND ASSOCIATED CIRCUIT AND LOCAL OSCILLATOR

摘要

A circuit for generating a plurality of oscillating signals with different phases includes a frequency divider, a first delay chain, a second delay chain and a calibration circuit. The frequency divider is arranged for frequency dividing a first input signal and a second input signal to generate a first frequency-divided input signal and a second frequency-divided input signal. The first delay chain is arranged for delaying the first frequency-divided input signal, and the second delay chain is arranged for delaying the second frequency-divided input signal. The calibration circuit is arranged for controlling delay amounts of the first delay chain and the second delay chain according to signals within the first delay chain or the second delay chain; wherein output signals of a portion delay cells within the first delay chain and the second delay chain serve as the plurality of oscillating signals with different phases.

主权项

1. A circuit for generating a plurality of oscillating signals with different phases, comprising:
a frequency divider, for frequency dividing a first input signal and a second input signal to generate a first frequency-divided input signal and a second frequency-divided input signal; a first delay chain comprising a plurality of first delay cells connected in series, for receiving the first frequency-divided input signal; a second delay chain comprising a plurality of second delay cells connected in series, for receiving the second frequency-divided input signal; and a calibration circuit, coupled to the first delay chain and the second delay chain, for controlling delay amounts of the first delay chain and the second delay chain according to signals within the first delay chain or the second delay chain; wherein output signals of a portion of the first delay cells and the second delay cells serve as the plurality of oscillating signals with different phases.