Quadrature divider
AssigneeTexas Instruments Incorporated
InventorLorenzo Maria Carpineto
Life of this patent
Estimating the term…
Abstract
A quadrature divider includes a first analog mixer (20, 30) for receiving a digital input signal at a predetermined frequency at a first input of the mixer and a second analog mixer (24, 32) for receiving the input signal with a 180° phase shift at a first input of the mixer. The output of the first mixer is coupled to a second input of the first mixer and an output of the second mixer is coupled to a second input of the second mixer.
Claims18
A quadrature divider comprising:
- a first analog mixer receiving a digital input signal at a predetermined frequency at a first input of said mixer;
- a second analog mixer receiving said input signal with a 180° phase shift at a first input of said mixer;
- wherein an output of said first mixer is coupled to a second input of said first mixer and an output of said second mixer is coupled to a second input of said second mixer.
A quadrature divider comprising:
- a first differential analog mixer receiving a digital input signal at a predetermined frequency at a first input of said mixer;
- a second differential analog mixer receiving said input signal with a 180° phase shift at a first input of said mixer;
- wherein an output of said first mixer is coupled to a second input of said first mixer and an output of said second mixer is coupled to a second input of said second mixer and
- wherein said input signal is coupled to said first mixer with a first polarity orientation and said input signal is coupled to said second mixer with a second polarity orientation, such that the inputs to said first and second mixers are shifted by 180° to one another.
A transmitter comprising:
- an oscillator for generating a first signal of known frequency
- a quadrature divider for dividing the frequency of said first signal and generating a first quadrature signal associated with said first signal, comprising:
- a first analog mixer receiving said first signal at a predetermined frequency at a first input of said mixer;
- a second analog mixer receiving said first signal with a 180° phase shift at a first input of said mixer;
- wherein an output of said first mixer is coupled to a second input of said first mixer and an output of said second mixer is coupled to a second input of said second mixer;
- and
- circuitry for mixing said quadrature signal from said quadrature divider with a second quadrature signal.
A method of generating a divided quadrature signal from a digital input signal at a predetermined frequency, comprising the steps of:
- receiving said input signal at a first input of a first analog mixer;
- receiving said input signal with a 180° phase shift at a first input of a second analog mixer;
- wherein an output of said first mixer is coupled to a second input of said first mixer and an output of said second mixer is coupled to a second input of said second mixer.
A method of generating a divided quadrature signal from a digital differential input signal at a predetermined frequency, comprising the steps of:
- receiving said differential input signal at a first input of a first analog mixer;
- receiving said differential input signal with a 180° phase shift at a first input of a second analog mixer;
- and
- wherein an output of said first mixer is coupled to a second input of said first mixer and an output of said second mixer is coupled to a second input of said second mixer and wherein said step of receiving said differential input signal at said first input of said first mixer comprises the step of receiving said differential input signal with a first polarity at said first input of said first mixer and said step of receiving said differential input signal at said first input of said second mixer comprises the step of receiving said differential input signal with an opposite polarity at said first input of said second mixer, such that the inputs to said first and second mixers are shifted by 180° to one another.
Dependencies are inferred from the claim text.