Patent US5530929A successfully refreshed from Google Patents.
US5530929A
Expired / Lapsed
US
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Homodyne receiver minimizing oscillator leakage
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1994-09-08
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Granted: 1996-06-25
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Expires: 2014-09-08
Abstract
Abstract A method and a device in a homodyne receiver including a local oscillator generating an oscillator signal at a frequency of f LO , a mixer, and a reception device for receiving an input signal having a frequency of f RF , the oscillator signal and the input signal being supplied to the mixer. The oscillator signal is supplied to a first processing unit to produce a first output signal having a frequency of M*f LO , where M is an integer value. The first output signal is supplied to a second processing unit to produce a second output signal having a frequency of M*f LO /N=f LO , where N is an integer number and M≠N, and the mixer and the second processing unit are integrated to minimize leakage of signals being supplied to the mixer from the second processing unit.
Inventors
- 👤 Bjorn Lindqvist
- 👤 Martin Isberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:00
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26; H03; H03D; H03D1/00; H03D1/22; H03D1/2245; H04B1/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A method in a homodyne receiver including a local oscillator generating an oscillator signal at a frequency of f LO , a mixer, and reception means for receiving an input signal having a frequency of f RF , the oscillator signal and the input signal being supplied to the mixer, comprising the steps of: (a) supplying the oscillator signal to a first processing unit to produce a first output signal having a frequency of M*f LO , where M is an integer value, (b) supplying the first output signal to a second processing unit to produce a second output signal having a frequency of M*f LO /N=f RF , where N is an integer number and M≠N, and (c) integrating the mixer and the second processing unit to minimize leakage of signals being supplied to the mixer from the second processing unit.
Claim 2
Independent Claim
142 words
A method in a homodyne receiver including a local oscillator generating an oscillator signal at a frequency of f LO , a mixer, and reception means for receiving an input signal having a frequency of f RF , the oscillator signal and the input signal being supplied to the mixer, comprising the steps of: (a) supplying the oscillator signal to a first processing unit to produce a first output signal having a frequency of M*f LO , where M is an integer value, (b) supplying the first output signal to a second processing unit to produce a second output signal having a frequency of M*f LO /N=f RF , where N is an integer number and M≠N, and (c) integrating the mixer and the second processing unit to minimize leakage of signals being supplied to the mixer from the second processing unit.
Claim 3
Dependent Claim
36 words
The method of claim 1, wherein the oscillator signal is a balanced output signal, including a first oscillator signal and a second oscillator signal, the second oscillator signal being shifted 180° from the first oscillator signal.
Claim 4
Dependent Claim
47 words
The method of claim 1, further comprising the steps of: phase shifting the second output signal by substantially 90° to produce a phase shifted signal, and supplying the second output signal to the mixer and the phase shifted signal to a second mixer to obtain quadrature signals.
Claim 5
Independent Claim
140 words
A device in a homodyne receiver including a local oscillator for generating an oscillator signal at a frequency of f LO , a mixer, and reception means for receiving an input signal having a frequency of f RF , the oscillator and the reception means being operatively connected to the mixer, comprising: a first processing unit operatively connected to the local oscillator for producing a first output signal having a frequency of M*f LO , where M is an integer value, and a second processing unit operatively connected to the first processing unit for producing a second output signal having a frequency of M*f LO /N=f RF , where N is an integer number and M≠N, wherein the mixer and the second processing unit are integrated to minimize leakage of signals supplied to the mixer from the second processing unit.
Claim 6
Independent Claim
140 words
A device in a homodyne receiver including a local oscillator for generating an oscillator signal at a frequency of f LO , a mixer, and reception means for receiving an input signal having a frequency of f RF , the oscillator and the reception means being operatively connected to the mixer, comprising: a first processing unit operatively connected to the local oscillator for producing a first output signal having a frequency of M*f LO , where M is an integer value, and a second processing unit operatively connected to the first processing unit for producing a second output signal having a frequency of M*f LO /N=f RF , where N is an integer number and M≠N, wherein the mixer and the second processing unit are integrated to minimize leakage of signals supplied to the mixer from the second processing unit.
Claim 7
Dependent Claim
22 words
The device of claim 4, wherein the first processing unit is a multiplier and the second processing unit is a divider circuit.
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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) | 1999-06-25 | 1999-12-25 | 2000-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-25 | 2003-12-25 | 2004-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-25 | 2007-12-25 | 2008-06-25 | $7700.00 | Window Closed / Lapsed |