US6029052A
Expired / Lapsed
US
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Multiple-mode direct conversion receiver
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1997-07-01
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Granted: 2000-02-22
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Expires: 2017-07-01
Abstract
Abstract A multiple-mode receiver incorporating direct conversion (processing received signals using intermediate frequencies within the same frequency range as the received signal bandwidth) rather than superheterodyne circuitry, allowing receiver hardware components to be re-used rather than replicated for each band. Various embodiments are disclosed in which low pass filters, mixers, quadrature generators, oscillators, and amplifiers are re-used.
Inventors
- 👤 Martin Isberg
- 👤 Bjorn Lindquist
- 👤 Peter Jakobsson
- 👤 Jan Celander
- 👤 Kjell Gustafsson
- 👤 Lars-Peter Kunkel
- 👤 Torsten Carlsson
- 👤 Jacob Mannerstråle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:21
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04W; H04W88/00; H04W88/02; H04W88/06; H03; H03J; H03J5/00; H03J5/24; H03J5/242; H03J5/244; H04B1/005; H04B1/0053; H04B1/0057; H04B1/006; H04B1/38; H04B1/40; H04B1/403; H04B1/406
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
123 words
A multiple-band communication receiver, comprising: receiving means for receiving communication signals in any one of a plurality of frequency bands, the received communication signals having a bandwidth; amplifier means for selectively amplifying the received communication signals in one of the plurality of frequency bands, wherein the amplifier means includes at least one band-specific amplifier for each of the plurality of frequency bands; quadrature generation means for generating in-phase and quadrature signals from the amplified signals; low pass filtering means for filtering the in-phase and quadrature signals; and baseband processing means for processing the filtered in-phase and quadrature signals, wherein the multiple-band communication receiver uses direct conversion for converting all of the received communication signals in any one of the plurality of frequency bands.
Claim 2
Dependent Claim
123 words
A multiple-band communication receiver, comprising: receiving means for receiving communication signals in any one of a plurality of frequency bands, the received communication signals having a bandwidth; amplifier means for selectively amplifying the received communication signals in one of the plurality of frequency bands, wherein the amplifier means includes at least one band-specific amplifier for each of the plurality of frequency bands; quadrature generation means for generating in-phase and quadrature signals from the amplified signals; low pass filtering means for filtering the in-phase and quadrature signals; and baseband processing means for processing the filtered in-phase and quadrature signals, wherein the multiple-band communication receiver uses direct conversion for converting all of the received communication signals in any one of the plurality of frequency bands.
Claim 3
Dependent Claim
23 words
The receiver of claim 1, further comprising band pass filtering means for filtering communication signals in each of the plurality of frequency bands.
Claim 4
Dependent Claim
42 words
The receiver of claim 1, wherein the quadrature generation means includes mixing means for mixing the amplified signals with in-phase and quadrature oscillator signals, the in-phase and quadrature oscillator signals being of a frequency within the bandwidth of the received communication signals.
Claim 5
Dependent Claim
20 words
The receiver of claim 1, wherein the low pass filtering means includes a low pass filter having a programmable bandwidth.
Claim 6
Dependent Claim
16 words
The receiver of claim 1, wherein the quadrature generation means includes a single voltage controlled oscillator.
Claim 7
Dependent Claim
15 words
The receiver of claim 1, wherein the quadrature generation means includes multiple voltage controlled oscillators.
Claim 8
Dependent Claim
26 words
The receiver of claim 1, wherein the amplifier means further includes at least one common amplifier for amplifying signals output by the frequency-specific low noise amplifiers.
Claim 9
Dependent Claim
25 words
The receiver of claim 1, wherein the quadrature generation means includes a quadrature generator shared between two or more of the plurality of frequency bands.
Claim 10
Dependent Claim
14 words
The receiver of claim 1, wherein the quadrature generation means includes multiple quadrature generators.
Claim 11
Dependent Claim
20 words
The receiver of claim 1, wherein the quadrature generation means includes at least one oscillator having a selectable oscillation frequency.
Claim 12
Dependent Claim
34 words
The receiver of claim 1, wherein the quadrature generation means includes at least one oscillator and a frequency dividing means for dividing an oscillator signal generated by one of the at least one oscillator.
Claim 13
Dependent Claim
16 words
The receiver of claim 1, wherein the plurality of frequency bands each has a different bandwidth.
Claim 14
Independent Claim
107 words
A method for receiving a communication signal, comprising the steps of: receiving a communication signal in any one of a plurality of frequency bands, the communication signal having a bandwidth; band-pass filtering the received communication signal; amplifying the band-pass filtered signal; mixing the band-pass filtered signal with in-phase and quadrature oscillator signals to generate an in-phase and a quadrature received signal; and low pass filtering the in-phase received signal and the quadrature received signal in a low pass in-phase filter and a low pass quadrature filter, respectively, wherein direct conversion is used for converting all received communication signals in any one of the plurality of frequency bands.
Claim 15
Independent Claim
107 words
A method for receiving a communication signal, comprising the steps of: receiving a communication signal in any one of a plurality of frequency bands, the communication signal having a bandwidth; band-pass filtering the received communication signal; amplifying the band-pass filtered signal; mixing the band-pass filtered signal with in-phase and quadrature oscillator signals to generate an in-phase and a quadrature received signal; and low pass filtering the in-phase received signal and the quadrature received signal in a low pass in-phase filter and a low pass quadrature filter, respectively, wherein direct conversion is used for converting all received communication signals in any one of the plurality of frequency bands.
Claim 16
Dependent Claim
23 words
The method of claim 13, wherein the in-phase received signal and the quadrature received signal are within the bandwidth of the communication signal.
Claim 17
Dependent Claim
31 words
The method of claim 13, wherein the low pass in-phase filter and the low pass quadrature filter have programmable bandwidths which can be changed to accommodate communication signals of different bandwidths.
Claim 18
Dependent Claim
31 words
The method of claim 13, further comprising the step of generating the in-phase and quadrature oscillator signals from an oscillator having a variable oscillation frequency prior to the step of mixing.
Claim 19
Dependent Claim
46 words
The method of claim 13, wherein the step of amplifying is performed by first amplifying the band-pass filtered signal in a frequency-specific low noise amplifier, and then amplifying the first amplified signal in a generic low noise amplifier capable of amplifying signals having different frequency ranges.
Claim 20
Dependent Claim
35 words
The method of claim 13, further comprising the steps of generating a first oscillator signal and frequency-dividing the first oscillator signal to generate the in-phase and quadrature oscillator signals prior to the step of mixing.
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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) | 2003-02-21 | 2003-08-23 | 2004-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-21 | 2007-08-23 | 2008-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-21 | 2011-08-23 | 2012-02-22 | $7700.00 | Window Closed / Lapsed |