Configurable single and dual VCOs for dual- and tri-band wireless communication systems
First Claim
1. A wireless communication system including a receiver subsystem capable of receiving radio signals with varying frequency ranges, said receiver subsystem comprising:
- a first receive signal operating within a desired first frequency range,a second receive signal operating within a desired second frequency range;
at least one frequency oscillating device for generating a reference signal with a pre-selected local oscillator frequency;
a first mixing device, responsive to said first receive signal and said reference signal, for producing a first converted signal at an intermediate frequency; and
a second mixing device, responsive to said second receive signal and said reference signal, for producing a second converted signal at said intermediate frequency.
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Accused Products
Abstract
A wireless communication with a receiver subsystem capable of supporting communications operating on two or three distinct frequency bands while incorporating only one or two oscillating devices, respectively. For example, such a subsystem could be integrated in a wireless communication hand-held device configured to operate within three frequency ranges in order to support Cellular, PCS, and GPS services. The receiver subsystem includes a receiver subsystem front end configured to receive first, second, and third receive signals operating under three different frequency bands. The three receive signals are subjected to front-stage filtering, low-noise amplifier, and bandpass filtering in order to remove any unwanted radio frequency components. The first signal is subsequently down-converted into an IF signal by mixing it with a first reference signal generated by a first voltage controlled oscillator (VCO). The first VCO operates with a frequency band that is broader than necessary and generates the first reference signal with a predetermined frequency such that the mixing operation produces a specific common IF frequency. The second signal and third signals are similarly down-converted to a second common IF signal by mixing it with a second reference signal generated by a second voltage controlled oscillator (VCO). The present invention also includes a VCO feedback control loop, including a phased-lock-loop, for maintaining the accuracy and stability of the frequency signals produced by the first and second VCOs.
136 Citations
17 Claims
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1. A wireless communication system including a receiver subsystem capable of receiving radio signals with varying frequency ranges, said receiver subsystem comprising:
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a first receive signal operating within a desired first frequency range, a second receive signal operating within a desired second frequency range; at least one frequency oscillating device for generating a reference signal with a pre-selected local oscillator frequency; a first mixing device, responsive to said first receive signal and said reference signal, for producing a first converted signal at an intermediate frequency; and a second mixing device, responsive to said second receive signal and said reference signal, for producing a second converted signal at said intermediate frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless communication system including a receiver subsystem capable of receiving radio signals with varying frequency ranges, said receiver subsystem comprising:
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a first receive signal operating within a desired first frequency range; a second receive signal operating within a desired second frequency range; a third receive signal operating within a desired third frequency range; a first frequency oscillating device, having a first local oscillator frequency range, for generating a first reference signal; a second frequency oscillating device, having a second local oscillator frequency range, for generating a second and a third reference signal; a first mixing device, responsive to said first receive signal and first reference signal, for producing a first converted signal at a first intermediate frequency; a second mixing device, responsive to said second receive signal and second reference signal, for producing a second converted signal at a second intermediate frequency; and a third mixing device, responsive to said third receive signal and third reference signal, for producing a third converted signal at said second intermediate frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification