Dual-band radio receiver
First Claim
1. A dual-band superheterodyne receiver comprising:
- a) a front end including first and second signal paths connected to a common output point for receiving radio frequency signals in first and second radio frequency bands respectively;
b) a first frequency synthesizer for generating a first injection signal;
c) a second frequency synthesizer for generating a second injection signal;
d) an injection signal mixer for combining said first and second injection signals to produce a third injection signal;
e) a first mixer in said first signal path for combining the received radio frequency signal on said first signal path with said first injection signal to produce a first intermediate frequency signal;
f) a first mixer in said second signal path for combining the received radio frequency signal on said second signal path with said third injection signal to produce a first intermediate frequency signal; and
g) a back end including a second mixer for mixing said first intermediate frequency signal with said second injection signal to produce a second intermediate frequency signal.
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Accused Products
Abstract
A simplified structure is disclosed for a dual-band, double-conversion superheterodyne receiver. All mixer-injection signals are generated by combining the outputs of two phase-locked frequency synthesizers driven by a single reference oscillator. The output of one synthesizer injects the receiver'"'"'s second mixer, which converts signals from the first intermediate frequency to the second intermediate frequency. The output of the other synthesizer has two uses: (1) it provides first mixer injection needed to tune the receiver to a primary band, and (2) it is mixed with the output of the first synthesizer to provide the first mixer injection needed to tune the receiver to an alternate band.
48 Citations
34 Claims
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1. A dual-band superheterodyne receiver comprising:
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a) a front end including first and second signal paths connected to a common output point for receiving radio frequency signals in first and second radio frequency bands respectively; b) a first frequency synthesizer for generating a first injection signal; c) a second frequency synthesizer for generating a second injection signal; d) an injection signal mixer for combining said first and second injection signals to produce a third injection signal; e) a first mixer in said first signal path for combining the received radio frequency signal on said first signal path with said first injection signal to produce a first intermediate frequency signal; f) a first mixer in said second signal path for combining the received radio frequency signal on said second signal path with said third injection signal to produce a first intermediate frequency signal; and g) a back end including a second mixer for mixing said first intermediate frequency signal with said second injection signal to produce a second intermediate frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for converting received radio frequency signals to first and second frequencies comprising the steps of:
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a) generating a first injection signal; b) generating a second injection signal; c) generating a third injection signal as a function of said first and second injection signals; d) receiving a radio frequency signal in a primary frequency band along a first signal path; e) mixing received radio frequency signals in said primary frequency band with said first injection signal to produce a first intermediate frequency signal; f) receiving a radio frequency signal in an alternate frequency band along a second signal path; g) mixing received radio frequency signals in said alternate frequency band with said third injection signal to generate a first intermediate frequency signal; and h) mixing said first intermediate frequency signal with said second injection signal to generate a second intermediate frequency signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A dual-band superheterodyne receiver comprising:
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a) a front end including first and second signal paths connected to a common output point for receiving radio frequency signals in distinct first and second radio frequency bands respectively; b) a first frequency synthesizer for generating a first injection signal; c) a second frequency synthesizer for generating a second injection signal; d) a first mixer in said first signal path for combining the received radio frequency signal on said first signal path with said first injection signal to produce a first intermediate frequency signal; e) a first mixer in said second signal path for combining the received radio frequency signal on said second signal path with said first injection signal to produce a first intermediate frequency signal; and f) a back end including a second mixer for mixing the first intermediate frequency signal with said second injection signal to produce a second intermediate frequency signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification