COMMUNICATIONS RECEIVER USING MULTI-BAND TRANSMIT BLOCKING FILTERS
First Claim
1. A dual-passband filter having a first passband, a second passband higher in frequency than the first passband, a first stopband lower in frequency than the first passband, and a second stopband between the first and second passbands, the dual pass-band filter comprising:
- a first surface acoustic wave (SAW) band-pass filter in parallel with a second SAW band-pass filter, wherein;
the first SAW band-pass filter passes the first passband, andthe second SAW band-pass filter passes the second passband.
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Accused Products
Abstract
Communications receivers and devices are disclosed. A communications receiver includes a low noise amplifier; a multi-band transmit blocking filter having a first port connected to an output of the low noise amplifier, and an RF analog-to-digital converter having an input connected to a second port of the multi-band transmit blocking filter. The multi-band transmit filter passes the receive frequencies of a group of two or more LTE bands, where a first receive frequency range of a first band in the group and a second receive frequency range of a second band in the group are disjoint and not subsets of a receive frequency range of a third band in the group, and attenuates the transmit frequencies of at least some bands in the group by at least twenty dB.
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Citations
18 Claims
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1. A dual-passband filter having a first passband, a second passband higher in frequency than the first passband, a first stopband lower in frequency than the first passband, and a second stopband between the first and second passbands, the dual pass-band filter comprising:
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a first surface acoustic wave (SAW) band-pass filter in parallel with a second SAW band-pass filter, wherein; the first SAW band-pass filter passes the first passband, and the second SAW band-pass filter passes the second passband. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communications receiver comprising:
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a low noise amplifier; a dual-passband filter having a first port connected to an output of the low noise amplifier; and an RF analog-to-digital converter having an input connected to a second port of the dual-passband filter, wherein the dual-passband filter has a first passband, a second passband higher in frequency than the first passband, a first stopband lower in frequency than the first passband, and a second stopband between the first and second passbands, and the dual pass-band filter comprises; a first surface acoustic wave (SAW) band-pass filter in parallel with a second SAW band-pass filter, the first SAW band-pass filter passing the first passband and the second SAW band-pass filter passing the second passband. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification