Wireless transceiver and frequency plan
First Claim
1. A wireless transceiver capable of transmitting CDMA signals to and receiving CDMA signals from a remote location, the wireless transceiver comprising:
- a first frequency synthesizer for providing a first mixing tone;
a second frequency synthesizer for providing a second mixing tone;
a first sampling source for providing a first source frequency;
a sampling circuit coupled to said first sampling source for providing a sampling signal; and
a receiving channel coupled to said first frequency synthesizer, to said second frequency synthesizer, and to said sampling source, said receiving channel comprising;
a first mixer configured to received said first mixing tone and a received signal, said first mixer producing a first IF signal in response;
a second mixer configured to receive said first IF signal and said second mixing tone, said second mixer producing a second IF signal in response; and
an analog to digital converter configured to receive said second IF signal and said sampling signal and for generating a digital data stream in response, wherein if said received signal is a CDMA signal, the frequency of said sampling signal is offset from the frequency of said second IF signal.
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Accused Products
Abstract
The present invention provides for an improved transceiver architecture using fewer frequency synthesizers. The number of frequency synthesizers is reduced by utilizing an existing frequency source having a frequency slightly offset from the ideal sampling frequency. In one embodiment, an improved transceiver capable of communicating CDMA encoded signals is presented. The transceiver includes a first frequency synthesizer producing a first mixing tone, a second frequency synthesizer producing a second mixing tone, a first sampling source producing a first sampling signal, and a receiving channel. The receiving channel includes a first mixer, a second mixer, and an analog to digital converter (ADC). The first mixer receives the incoming CDMA signal and the first mixing tone, producing a first IF signal. The second mixer receives the first IF signal and the second mixing tone, producing a second IF signal in response. The ADC receives the second IF signal and the first sampling signal, producing a digital data stream in response, whereby the frequency of the first sampling signal is offset from the frequency of the second IF signal, the digital data having a small amount of error associated therewith in proportion to the small amount of the frequency offset.
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Citations
18 Claims
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1. A wireless transceiver capable of transmitting CDMA signals to and receiving CDMA signals from a remote location, the wireless transceiver comprising:
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a first frequency synthesizer for providing a first mixing tone; a second frequency synthesizer for providing a second mixing tone; a first sampling source for providing a first source frequency; a sampling circuit coupled to said first sampling source for providing a sampling signal; and a receiving channel coupled to said first frequency synthesizer, to said second frequency synthesizer, and to said sampling source, said receiving channel comprising; a first mixer configured to received said first mixing tone and a received signal, said first mixer producing a first IF signal in response; a second mixer configured to receive said first IF signal and said second mixing tone, said second mixer producing a second IF signal in response; and an analog to digital converter configured to receive said second IF signal and said sampling signal and for generating a digital data stream in response, wherein if said received signal is a CDMA signal, the frequency of said sampling signal is offset from the frequency of said second IF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In a wireless transceiver capable of receiving CDMA signal from a remote location, a method for converting an incoming signal to a digital data stream comprising the steps of:
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receiving an incoming signal; synthesizing a first mixing tone; synthesizing a second mixing tone; generating a first sampling signal from a first sampling source; and demodulating said incoming signal into said digital data stream, comprising the steps of; frequency mixing said incoming signal with said first mixing tone, and in response, producing a first IF signal; frequency mixing said first IF signal with said second mixing tone, and in response, producing a second IF signal; and applying said first sampling signal and said second IF signal to an analog to digital converter, and in response producing said digital data stream, wherein if said incoming signal is a CDMA signal, the frequency of said first sampling signal is offset from the frequency of said second IF signal. - View Dependent Claims (16, 17, 18)
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Specification