Transmitter and receiver circuit for radio frequency signals
AssigneeAnalog Devices, Inc.
InventorsSimon Atkinson, Jonathan R. Strange, Robert J. Broughton, Alexander Shvarts
Life of this patent
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Abstract
A transceiver circuit is disclosed for use in radio frequency communication systems. The circuit includes a transmitter circuit, a receiver circuit and a local oscillator circuit. The local oscillator circuit includes at least one oscillator input signal having a frequency that is a non-integer multiple of the transmission frequency of the radio frequency communication system. The oscillator input signal is used to produce a transmitter local oscillator signal and a receiver local oscillator signal.
Claims18
A radio frequency transceiver for transmitting and receiving radio frequency signals, said transceiver comprising a transmitter circuit, a receiver circuit and a local oscillator circuit:
- said transmitter circuit that is coupled to a transceiver reference signal for transmitting quadrature related radio frequency signals, said transmitter circuit including (a) input means for receiving an input signal that is representative of information to be modulated and for producing an intermediate signal, (b) comparator means for receiving said intermediate signal and a comparator reference signal, and for producing a comparator output signal responsive to said intermediate signal and said comparator reference signal, and (c) feedback circuitry coupled to said comparator output signal for producing a feedback signal that is coupled to said input means, said feedback circuitry including a feedback mixer that is coupled to a feedback reference signal having a frequency of about 1350 MHz;
- said receiver circuit for receiving quadrature related radio frequency signals and being coupled to said transceiver reference signal;
- and
- said local oscillator circuit for producing said transceiver reference signal for said transmitter circuit and said receiver circuit.
A radio frequency transceiver for transmitting and receiving radio frequency signals having a frequency FRF, said transceiver comprising a transmitter circuit, a receiver circuit and a local oscillator circuit:
- said transmitter circuit for transmitting quadrature related radio frequency signals, said transmitter circuit including frequency multiplication means for providing a 1/x frequency multiplication of a local oscillator signal;
- said receiver circuit for receiving quadrature related radio frequency signals and being coupled to said local oscillator signal;
- and
- said local oscillator circuit for producing said local oscillator signal for said transmitter circuit and for said receiver circuit, said local oscillator signal having a frequency FLO where FRF=FLO (1/x+1) in a first frequency band of operation of said transceiver, and FRF=FLO(1/x−1) in a second frequency band of operation of said transceiver.
A dual band radio frequency transceiver for transmitting and receiving dual band radio frequency signals, said transceiver comprising:
- a transmitter circuit for transmitting quadrature related radio frequency signals having a frequency of FRF, said transmitter circuit including a frequency multiplication means providing a 1/x frequency multiplication;
- and
- a local oscillator circuit for providing a local oscillator signal at a frequency of FLO, where FRF=FLO (1/x+1) in a first operation frequency band, and FRF=FLO (1/x−1) in a second operation frequency band.
Dependencies are inferred from the claim text.