Dividing a frequency by 1.5 to produce a quadrature signal
AssigneeQUALCOMM Incorporated
InventorsWingching Vincent Leung, Zixiang Yang
Life of this patent
Estimating the term…
Abstract
An apparatus for dividing a frequency by 1.5 to produce a quadrature signal is disclosed. The apparatus includes a divider that receives a differential input signal with a first frequency and two phases and creates a six-phase signal at a second frequency. The second frequency is the first frequency divided by 3. The apparatus also includes precision phase rotation circuitry that receives the six-phase signal and produces an eight-phase signal. The apparatus also includes a doubler that receives the eight-phase signal and produces a quadrature signal. The quadrature signal has a third frequency that is the first frequency divided by 1.5.
Claims26
An apparatus for dividing a frequency by 1.5 to produce a quadrature signal, comprising:
- a divider that receives a differential input signal with a first frequency and two phases and creates a six-phase signal at a second frequency, wherein the second frequency is the first frequency divided by 3;
- precision phase rotation circuitry that receives the six-phase signal and produces an eight-phase signal, wherein the precision phase rotation circuitry comprises one or more delay cells that each rotate one or more phases in the six-phase signal;
- and
- a doubler that receives the eight-phase signal and produces a quadrature signal, wherein the quadrature signal has a third frequency that is the first frequency divided by 1.5.
A method for dividing a frequency by 1.5 to produce a quadrature signal, comprising:
- receiving a differential signal with a first frequency;
- creating a six-phase signal at a second frequency based on the differential signal, wherein the second frequency is the first frequency divided by 3;
- converting the six-phase signal to an eight-phase signal at the second frequency, wherein the converting the six-phase signal to an eight-phase signal comprises using precision phase rotation circuitry comprising one or more delay cells that each rotate one or more phases in the six-phase signal;
- and
- converting the eight-phase signal to a quadrature signal at a third frequency, wherein the third frequency is the first frequency divided by 1.5.
An apparatus for dividing a frequency by 1.5 to produce a quadrature signal, comprising:
- means for receiving a differential signal with a first frequency;
- means for creating a six-phase signal at a second frequency based on the differential signal, wherein the second frequency is the first frequency divided by 3;
- means for converting the six-phase signal to an eight-phase signal at the second frequency, wherein the means for converting the six-phase signal to an eight-phase signal comprises one or more means for delaying that each rotate one or more phases in the six-phase signal;
- and
- means for converting the eight-phase signal to a quadrature signal at a third frequency, wherein the third frequency is the first frequency divided by 1.5.
A computer-program product for dividing a frequency by 1.5 to produce a quadrature signal, the computer-program product comprising a non-transitory computer-readable medium having instructions thereon, the instructions, comprising:
- code for receiving a differential signal with a first frequency;
- code for creating a six-phase signal at a second frequency based on the differential signal, wherein the second frequency is the first frequency divided by 3;
- code for converting the six-phase signal to an eight-phase signal at the second frequency, wherein the code for converting the six-phase signal to an eight-phase signal comprises code for delaying that rotates one or more phases in the six-phase signal;
- and
- code for converting the eight-phase signal to a quadrature signal at a third frequency, wherein the third frequency is the first frequency divided by 1.5.
Dependencies are inferred from the claim text.