Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations
DC CAFCFirst Claim
1. A wireless modem apparatus, comprising:
- a receiver for frequency down-converting an input signal including, a first frequency down-conversion module to down-convert the input signal, wherein said first frequency down-conversion module down-converts said input signal according to a first control signal and outputs a first down-converted signal;
a second frequency down-conversion module to down-convert said input signal, wherein said second frequency down-conversion module down-converts said input signal according to a second control signal and outputs a second down-converted signal; and
a subtractor module that subtracts said second down-converted signal from said first down-converted signal and outputs a down-converted signal;
wherein said second control signal is delayed relative to said first control signal by (0.5+n) cycles of said input signal, wherein n is an integer greater than or equal to 1.
1 Assignment
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Accused Products
Abstract
Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal generator, a demodulation/modulation facilitation module, and a MAC interface. The WLAN receiver includes at least one universal frequency translation module that frequency down-converts a received EM signal. In embodiments, the UFT based receiver is configured in a multi-phase embodiment to reduce or eliminate re-radiation that is caused by DC offset. The WLAN transmitter includes at least one universal frequency translation module that frequency up-converts a baseband signal in preparation for transmission over the wireless LAN. In embodiments, the UFT based transmitter is configured in a differential and multi-phase embodiment to reduce carrier insertion and spectral growth.
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Citations
32 Claims
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1. A wireless modem apparatus, comprising:
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a receiver for frequency down-converting an input signal including, a first frequency down-conversion module to down-convert the input signal, wherein said first frequency down-conversion module down-converts said input signal according to a first control signal and outputs a first down-converted signal;
a second frequency down-conversion module to down-convert said input signal, wherein said second frequency down-conversion module down-converts said input signal according to a second control signal and outputs a second down-converted signal; and
a subtractor module that subtracts said second down-converted signal from said first down-converted signal and outputs a down-converted signal;
wherein said second control signal is delayed relative to said first control signal by (0.5+n) cycles of said input signal, wherein n is an integer greater than or equal to 1. - View Dependent Claims (5)
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2. A wireless modem apparatus, comprising:
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a receiver for frequency down-converting an input signal including, a first frequency down-conversion module to down-convert the input signal, wherein said first frequency down-conversion module down-converts said input signal according to a first control signal and outputs a first down-converted signal;
a second frequency down-conversion module to down-convert said input signal, wherein said second frequency down-conversion module down-converts said input signal according to a second control signal and outputs a second down-converted signal; and
a subtractor module that subtracts said second down-converted signal from said first down-converted signal and outputs a down-converted signal;
wherein said first frequency down-conversion module under-samples said input signal according to said first control signal, and said second frequency down-conversion module under-samples said input signal according to said second control signal.
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3. A wireless modem apparatus, comprising:
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a receiver for frequency down-converting an input signal including, a first frequency down-conversion module to down-convert the input signal, wherein said first frequency down-conversion module down-converts said input signal according to a first control signal and outputs a first down-converted signal;
a second frequency down-conversion module to down-convert said input signal, wherein said second frequency down-conversion module down-converts said input signal according to a second control signal and outputs a second down-converted signal; and
a subtractor module that subtracts said second down-converted signal from said first down-converted signal and outputs a down-converted signal;
wherein said first and said second frequency down-conversion modules each comprise a switch and a storage element. - View Dependent Claims (4)
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6. A wireless modem apparatus, comprising:
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a receiver for frequency down-converting an input signal including, a first frequency down-conversion module to down-convert the input signal, wherein said first frequency down-conversion module down-converts said input signal according to a first control signal and outputs a first down-converted signal;
a second frequency down-conversion module to down-convert said input signal, wherein said second frequency down-conversion module down-converts said input signal according to a second control signal and outputs a second down-converted signal;
a subtractor module that subtracts said second down-converted signal from said first down-converted signal and outputs a down-converted signal;
a transmitter for up-converting a baseband signal and coupled to said receiver, including, an inverter, to receive said baseband signal and generate an inverted baseband signal;
a first controlled switch, coupled to a non-inverting output of said inverter, said first controlled switch to sample said baseband signal according to a third control signal, resulting in a first harmonically rich signal;
a second controlled switch, coupled to an inverting output of said inverter, said second controlled switch to sample said inverted baseband signal according to a fourth control signal, resulting in a second harmonically rich signal; and
a combiner, coupled to an output of said first controlled switch and an output of said second controlled switch, said combiner to combine said first harmonically rich signal and said second harmonically rich signal, resulting in a third harmonically rich signal. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. In a wireless LAN device, a method of down-converting a received RF signal, comprising:
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down-converting said received RF signal according to a first control signal and a second control signal, resulting in a down-converted signal, wherein said second control signal is delayed relative to said first control signal by (0.5+n) cycles of said received RF signal, wherein n is an integer greater than or equal to 1;
de-spreading said down-converted signal using a spreading code, resulting in a de-spread signal; and
de-modulating said de-spread signal, resulting in a de-modulated signal.
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Specification