Wireless transceivers with filter arrangement for WiFi and WiMAX coexsistence
First Claim
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1. A WiFi/WiMAX (WiWi) device, comprising:
- a WiMAX transceiver; and
a WiFi transceiver;
wherein the WiMAX transceiver comprises;
a WiMAX radio frequency (RF) integrated circuit (RFIC); and
a first RF analog front end, coupled to the WiMAX RFIC;
wherein the first RF analog front end comprises;
a WiMAX transmit path, including a first WiMAX band-pass filter (BPF) and a first power amplifier (PA), the first WiMAX BPF placed before the first PA in the WiMAX transmit path, wherein the first WiMAX BPF is configured to band-pass, filter WiMAX transmissions from the WiMAX RFIC to reduce emissions outside of a WiMAX frequency band contained in the WiMAX transmissions, thus protecting the WiFi transceiver from said emissions; and
first and second WiMAX receive paths, each including a first low-noise amplifier (LNA) and a second WiMAX BPF, the second WiMAX BPF placed before the first LNA in the first and second WiMAX receive paths.
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Abstract
Embodiments provide WiFi and WiMAX tailored transceiver radio frequency (RF) filtering techniques and configurations to enable coexistence between WiFi and WiMAX transceivers operating in close proximity. In particular, embodiments provide filtering techniques to reject emissions from WiMAX into WiFi, and vice versa. The filtering techniques eliminate the need for additional isolation between WiMAX and WiFi antennas (approximately 50 dB), which is beyond what is achievable in practice. Embodiments can be tailored according to different use cases of the WiFi and WiMAX transceivers (e.g., fixed CPE, portable router, smart phone with tethering).
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Citations
25 Claims
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1. A WiFi/WiMAX (WiWi) device, comprising:
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a WiMAX transceiver; and a WiFi transceiver; wherein the WiMAX transceiver comprises; a WiMAX radio frequency (RF) integrated circuit (RFIC); and a first RF analog front end, coupled to the WiMAX RFIC; wherein the first RF analog front end comprises; a WiMAX transmit path, including a first WiMAX band-pass filter (BPF) and a first power amplifier (PA), the first WiMAX BPF placed before the first PA in the WiMAX transmit path, wherein the first WiMAX BPF is configured to band-pass, filter WiMAX transmissions from the WiMAX RFIC to reduce emissions outside of a WiMAX frequency band contained in the WiMAX transmissions, thus protecting the WiFi transceiver from said emissions; and first and second WiMAX receive paths, each including a first low-noise amplifier (LNA) and a second WiMAX BPF, the second WiMAX BPF placed before the first LNA in the first and second WiMAX receive paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A WiFi/WiMAX (WiWi) device, comprising:
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a WiMAX transceiver; and a WiFi transceiver; wherein the WiMAX transceiver comprises; a WiMAX radio frequency (RF) integrated circuit (RFIC); and a first RF analog front end, coupled to the WiMAX RFIC; wherein the first RF analog front end comprises; a WiMAX transmit path, including a first power amplifier (PA); and first and second WiMAX receive paths, each including a roofing filter, a first low-noise amplifier (LNA), and a first WiMAX notch filter, the roofing filter placed before the first LNA and the first WiMAX notch filter placed after the first LNA in the first and second WiMAX receive paths, wherein the first WiMAX notch filter is configured to notch out emissions in a WiFi band from received signals, thus protecting the WiMAX transceiver from said emissions. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A WiFi/LTE device, comprising:
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an LTE transceiver; and a WiFi transceiver; wherein the LTE transceiver comprises; an LTE radio frequency (RF) integrated circuit (RFIC); and a first RF analog front end, coupled to the LTE RFIC; wherein the first RF analog front end comprises; an LTE transmit path, including a first LTE band-pass filter (BPF) and a first power amplifier (PA), the first LTE BPF placed before thy, first PA in the LTE transmit path, wherein the first BPF is configured to band-pass filter LTE transmissions from the LTE RFIC to reduce emissions outside of an LTE frequency band contained in the LTE transmissions, thus protecting the WiFi transceiver from said emissions; and first and second LTE receive paths, each including a first low-noise amplifier (LNA) and a second LTE BPF, the second LTE BPF placed before the first LNA in the first and second LTE receive paths. - View Dependent Claims (24, 25)
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Specification