DUAL MODE SATELLITE SIGNAL RECEIVER AND METHOD THEREOF
First Claim
1. A dual mode satellite signal receiver capable of supporting at least two global navigation satellite systems, the dual mode satellite signal receiver comprising:
- a frequency synthesizer operative to generate a local oscillator signal based on a reference frequency wherein the frequency synthesizer is capable of supporting multiple reference frequencies;
a mixer operative to mix the local oscillator signal with a satellite signal and outputting a mixed signal where the mixed signal comprises a signal in an intermediate frequency band;
a first filter operative to filter the mixed signal to reject an image signal and output an actual signal;
a second filter operative to filter the actual signal received from the first filter to output a signal in a predetermined bandwidth based on a mode of the receiver; and
a variable gain amplifier operative to amplify the signal received from the second filter to a predetermined level and output the amplified signal.
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Abstract
A dual mode satellite signal receiver capable of supporting at least two global navigation satellite systems and a satellite signal receiving method are provided. The dual mode satellite signal receiver comprises a frequency synthesizer for generating a local oscillator signal based on a reference frequency; a mixer for mixing the local oscillator signal with a satellite signal and outputting the mixed signal as a signal of an intermediate frequency band; a first filter for filtering the signal output from the mixer to reject an image signal and output only an actual signal; a second filter for filtering the actual signal to output only a predetermined bandwidth according to a positioning mode; and an amplifier for amplifying the second filter output signal to a predetermined level and outputting the amplified signal.
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Citations
18 Claims
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1. A dual mode satellite signal receiver capable of supporting at least two global navigation satellite systems, the dual mode satellite signal receiver comprising:
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a frequency synthesizer operative to generate a local oscillator signal based on a reference frequency wherein the frequency synthesizer is capable of supporting multiple reference frequencies; a mixer operative to mix the local oscillator signal with a satellite signal and outputting a mixed signal where the mixed signal comprises a signal in an intermediate frequency band; a first filter operative to filter the mixed signal to reject an image signal and output an actual signal; a second filter operative to filter the actual signal received from the first filter to output a signal in a predetermined bandwidth based on a mode of the receiver; and a variable gain amplifier operative to amplify the signal received from the second filter to a predetermined level and output the amplified signal. - View Dependent Claims (2, 3, 4)
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5. A dual mode satellite signal receiver capable of supporting at least two global navigation satellite systems, the dual mode satellite signal receiver comprising:
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a frequency synthesizer operative to generate a local oscillator signal based on a reference frequency; a mixer operative to mix the local oscillator signal with a satellite signal and outputting a mixed signal where the mixed signal comprises a signal in an intermediate frequency band; a first filter operative to filter the mixed signal to reject an image signal and output an actual signal; a second filter operative to filter the actual signal received from the first filter to output a signal in a predetermined bandwidth based on a mode of the receiver; and a variable gain amplifier operative to amplify the signal received from the second filter to a predetermined level and output the amplified signal, wherein the variable gain amplifier is configured to utilize two internally-generated currents such that the ratio of the currents depend on either only NMOS or only PMOS transistors. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A satellite signal receiving method for a dual mode satellite signal receiver capable of supporting at least two global navigation satellite systems, the method comprising:
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generating a local oscillator signal based on a reference frequency; mixing the local oscillator signal with a satellite signal and outputting a mixed signal where the mixed signal comprises a signal in an intermediate frequency band; filtering the output signal in the intermediate frequency band to reject an image signal and output an actual signal; filtering the actual signal to output a signal in a predetermined bandwidth based on a mode of the receiver; and amplifying the output signal in the predetermined bandwidth to a predetermined level. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification