Patent US4026076A successfully refreshed from Google Patents.
US5963856A
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US
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Wireless receiver including tunable RF bandpass filter
Assignee: Avago Technologies International Sales Pte Ltd
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Filing: 1997-01-03
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Granted: 1999-10-05
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Expires: 2017-01-03
Abstract
Abstract The wireless receiver band is divided into a plurality of smaller bands using a tunable duplexer to produce a first IF signal of a much lower frequency enabling better unwanted signal filtering using a filter of a certain Q.
Inventors
- 👤 H. H. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:30
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/0003; H04B1/0028; H04B1/0032; H03; H03D; H03D7/00; H03D7/16; H03D7/161; H03D7/163; H03G; H03G5/00; H03G5/16; H03G5/24; H03G5/28; H03H; H03H7/00; H03H7/01; H03H7/12; H03H7/17; H03H7/1741; H03H7/1775; H03H7/1783; H04B1/005; H04B1/06; H04B1/16; H04B1/26; H03J; H03J2200/00; H03J2200/10; H04B1/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
94 words
A wireless receiver comprising a switched filter, operable under control of a control signal, for selecting one of a plurality of contiguous frequency sub-bands within the continuous bandwidth of a received modulated radio signal band; a single frequency synthesizer for producing a local oscillator signal selected using said control signal; a single stage mixer for mixing the selected frequency sub-band of the received radio signal with the selected local oscillator signal to produce one modulated fixed intermediate frequency (IF) signal; and a detector for detecting the modulated IF signal to recover a baseband signal.
Claim 2
Dependent Claim
94 words
A wireless receiver comprising a switched filter, operable under control of a control signal, for selecting one of a plurality of contiguous frequency sub-bands within the continuous bandwidth of a received modulated radio signal band; a single frequency synthesizer for producing a local oscillator signal selected using said control signal; a single stage mixer for mixing the selected frequency sub-band of the received radio signal with the selected local oscillator signal to produce one modulated fixed intermediate frequency (IF) signal; and a detector for detecting the modulated IF signal to recover a baseband signal.
Claim 3
Dependent Claim
29 words
The wireless receiver of claim 1 further comprising an image-reject filter, connected to the output of the switched filter, for rejecting an image-frequency signal in the selected frequency sub-band.
Claim 4
Dependent Claim
27 words
The wireless receiver of claim 1 further comprising a low-noise amplifier for receiving the modulated radio signal and outputting it to the image-reject filter or the mixer.
Claim 5
Dependent Claim
35 words
The wireless receiver of claim 1 further comprising an IF filter for filtering the modulated IF signal from the mixer to have a predetermined bandwidth and sending the filtered modulated IF signal to the detector.
Claim 6
Dependent Claim
41 words
The wireless receiver of claim 3 wherein the detector includes an analog I/Q demodulator for converting a modulated IF signal to an analog baseband signal and an analog-to-digital converter (ADC) for converting the analog baseband signal to a digital baseband signal.
Claim 7
Dependent Claim
42 words
The wireless receiver of claim 3 wherein the detector includes an analog-to-digital converter (ADC) for converting an analog modulated IF signal to a digital modulated IF signal and digital baseband receiver for demodulating the digital modulated IF signal into the baseband signal.
Claim 8
Dependent Claim
25 words
The wireless receiver of claim 5 wherein the frequency of the modulated IF signal is less than one-half of the sampling frequency of the ADC.
Claim 9
Dependent Claim
14 words
The wireless receiver of claim 1 wherein the mixer is an image rejection mixer.
Claim 10
Dependent Claim
21 words
The wireless receiver of claim 1 wherein the switched filter includes a multiple section filter having at least one switchable section.
Claim 11
Dependent Claim
45 words
The wireless receiver of claim 1 wherein the switched filter includes a multiple section filter having at least one switchable section and selected from a group of multiple section filters consisting of a 3-order elliptic filter, a 3-order Butterworth filter, and a 3-order Chebychev filter.
Claim 12
Dependent Claim
29 words
The wireless receiver of claim 1 wherein the switched filter includes a multiple section filter having at least one tunable section including a varactor for selecting a desired sub-band.
Claim 13
Dependent Claim
52 words
The wireless receiver of claim 1 wherein the switched filter is selected from a group of switched filters consisting of a plurality of switched Surface Acoustic Wave (SAW) devices, a plurality of switched ceramic filter devices, a plurality of switched dielectric filter devices, and a plurality of switched thin film resonator devices.
Claim 14
Dependent Claim
16 words
The wireless receiver of claim 1 wherein the switched filter is implemented using multi-chip module technology.
Claim 15
Dependent Claim
19 words
The wireless receiver of claim 1 wherein the switched filter is implemented using a low temperature co-fired ceramic technology.
Claim 16
Dependent Claim
27 words
The wireless receiver of claim 1 being part of a wireless transceiver and wherein the switched filter is shared with a wireless transmitter portion of the transceiver.
Claim 17
Independent Claim
112 words
A method of operating a wireless receiver comprising the steps of selecting, using a switched filter operable under control of a control signal, one of a plurality of contigious frequency sub-band within the bandwidth of a received modulated radio signal band; producing a predetermined local oscillator signal selected using said control signal which when mixed with a carrier signal associated with the selected switched filter produces one modulated fixed intermediate frequency (IF) signal; mixing, in a single stage mixer, the selected frequency band of the received modulated radio signal with the selected local oscillator signal to produce the modulated IF signal; and detecting the modulated IF signal to recover a baseband signal.
Claim 18
Independent Claim
112 words
A method of operating a wireless receiver comprising the steps of selecting, using a switched filter operable under control of a control signal, one of a plurality of contigious frequency sub-band within the bandwidth of a received modulated radio signal band; producing a predetermined local oscillator signal selected using said control signal which when mixed with a carrier signal associated with the selected switched filter produces one modulated fixed intermediate frequency (IF) signal; mixing, in a single stage mixer, the selected frequency band of the received modulated radio signal with the selected local oscillator signal to produce the modulated IF signal; and detecting the modulated IF signal to recover a baseband signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-10-04 | 2003-04-05 | 2003-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-04 | 2007-04-05 | 2007-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-04 | 2011-04-05 | 2011-10-05 | $7700.00 | Window Closed / Lapsed |