Frequency doubling circuits, method, and systems including quadrature phase generators
AssigneeEricsson Inc.
InventorNikolaus Klemmer
Life of this patent
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Abstract
A frequency doubling circuit includes a quadrature phase generator and a mixer coupled to the quadrature phase generator. The quadrature phase generator receives a reference signal having a reference frequency and generates first and second quadrature phase shifted signals having the reference frequency. The mixer receives the first and second quadrature phase shifted signals and generates an output signal having an output frequency twice that of the reference frequency. Related methods and communications devices are also discussed.
Claims42
A frequency doubling circuit for doubling the frequency of a reference signal having a reference frequency, the frequency doubling circuit comprising:
- a quadrature phase generator that receives the reference signal having the reference frequency and that generates first and second quadrature phase shifted signals having the reference frequency;
- and
- a mixer coupled to the quadrature phase generator wherein the mixer receives the first and second quatrature phase shifted signals and generates an output signal having an output frequency twice that of the reference frequency.
A frequency doubling method for doubling the frequency of a reference signal having a reference frequency, the method comprising the steps of:
- generating first and second quadrature phase shifted signals having the reference frequency;
- and
- generating an output signal having an output frequency twice that of the reference frequency responsive to the first and second quadrature phase shifted signals.
A frequency doubling circuit for doubling the frequency of a reference signal having a reference frequency, the frequency doubling circuit comprising:
- means for generating first and second quadrature phase shifted signals having the reference frequency responsive to the to the reference signal;
- and
- means for generating an output signal having an output frequency twice that of the reference frequency responsive to the first and second quadrature phase shifted signals.
A radio communications device for transmitting and receiving radio communications, the radio communications device comprising:
- a transmitter that transmits radio communications from the radio communications device;
- a receiver that receives radio communications at the radio communications device;
- a processor coupled to the transmitter and the receiver that controls transmission and reception of the radio communications;
- and
- a frequency generation circuit coupled to the transmitter and the receiver wherein the frequency generation circuit generates a communications frequency signal for the transmitter and receiver, the frequency generation circuit comprising,
- a reference signal generator that generates a reference signal having a reference signal,
- a quadrature phase generator that receives the reference signal having the reference frequency and that generates first and second quadrature phase shifted signals having the reference frequency, and
- a mixer coupled to the quadrature phase generator wherein the mixer receives the first and second quatrature phase shifted signals and generates the communications frequency signal having a communications frequency twice that of the reference frequency.
Dependencies are inferred from the claim text.