US6324389B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and circuit arrangement for processing a received signal
Assignee: Nokia Technologies Oy
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Filing: 1997-02-06
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Granted: 2001-11-27
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Expires: 2017-02-06
Abstract
Abstract A direct voltage component of a signal which has been received and converted to a baseband is separated by a first separator in a signal line. Also the direct voltage components of both the signal preceding the separator and the signal following the separator are controlled by control signals. Thus a baseband signal line preceding the first separator can be direct current coupled.
Inventors
- 👤 Risto Väisänen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:41
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/30; H03; H03D; H03D3/00; H03D3/007; H03D3/008
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
125 words
A circuit arrangement for processing a received radio frequency signal in a direct conversion receiver, said circuit arrangement comprising a demodulator for directly demodulating the received radio frequency signal into a baseband signal, a control circuit coupled to said demodulator for controlling the strength of the baseband signal, first separating means coupled to said control circuit for separating of direct voltage occurring in the baseband signal, an analog-to-digital converter coupled to said first separating means, means for controlling the direct voltage component of a first baseband signal preceding said first separating means on the basis of a first control signal, and means for controlling the direct voltage component of a second baseband signal following the separating means on the basis of a second control signal.
Claim 2
Dependent Claim
125 words
A circuit arrangement for processing a received radio frequency signal in a direct conversion receiver, said circuit arrangement comprising a demodulator for directly demodulating the received radio frequency signal into a baseband signal, a control circuit coupled to said demodulator for controlling the strength of the baseband signal, first separating means coupled to said control circuit for separating of direct voltage occurring in the baseband signal, an analog-to-digital converter coupled to said first separating means, means for controlling the direct voltage component of a first baseband signal preceding said first separating means on the basis of a first control signal, and means for controlling the direct voltage component of a second baseband signal following the separating means on the basis of a second control signal.
Claim 3
Dependent Claim
30 words
A circuit arrangement according to claim 1 , further comprising a second separating means for separating the direct voltage component which occurs in said control circuit from the constant potential.
Claim 4
Dependent Claim
38 words
A circuit arrangement according to claim 2 , further comprising means for controlling the charge state of said second separating means by said second control signal for controlling the direct voltage component which occurs in the control circuit.
Claim 5
Dependent Claim
25 words
A circuit arrangement according to claim 1 , wherein the signal line between the demodulator and the first separating means has been direct voltage coupled.
Claim 6
Dependent Claim
55 words
A circuit arrangement according to claim 1 , wherein the demodulator is an I/Q demodulator and to the output of its quadrature signal, a first branch has been connected for processing a baseband quadrature signal and to the output of the in-phase signal, a second branch has been connected for processing the in-phase baseband signal.
Claim 7
Dependent Claim
41 words
A circuit arrangement according to claim 1 , further comprising means for connecting a second signal to the output of the separating means and means for forming said second signal on the basis of a first signal preceding the separating means.
Claim 8
Dependent Claim
17 words
A circuit arrangement according to claim 1 , wherein the first and second control signals are identical.
Claim 9
Dependent Claim
12 words
A mobile station receiver comprising the circuit arrangement of claim 1 .
Claim 10
Dependent Claim
15 words
A digital time division mobile communication system comprising the circuit arrangement of claim 1 .
Claim 11
Independent Claim
106 words
A method for processing a received radio frequency signal in a direct conversion receiver, said method comprising: directly demodulating the received signal to an analog baseband signal; controlling the strength of the analog baseband signal using a control circuit; separating DC from said analog baseband signal using a first separating means; converting the analog baseband signal to a digital signal; controlling the DC component of a baseband signal at the input of the separating step in accordance with a first control signal; and controlling the DC component of a baseband signal at the output of the first separating means in accordance with a second control signal.
Claim 12
Independent Claim
106 words
A method for processing a received radio frequency signal in a direct conversion receiver, said method comprising: directly demodulating the received signal to an analog baseband signal; controlling the strength of the analog baseband signal using a control circuit; separating DC from said analog baseband signal using a first separating means; converting the analog baseband signal to a digital signal; controlling the DC component of a baseband signal at the input of the separating step in accordance with a first control signal; and controlling the DC component of a baseband signal at the output of the first separating means in accordance with a second control signal.
Claim 13
Dependent Claim
27 words
A method according to claim 10 , wherein the signal which is demodulated to a baseband is conducted to said first separating means as direct voltage coupled.
Claim 14
Dependent Claim
63 words
A method according to claim 10 , wherein the direct voltage component which occurs in said strength control circuit is separated from the constant potential by a second separating means of direct voltage and the charge state of said second separating means of direct voltage is controlled by a second control signal for controlling the direct voltage component occurring in the control circuit.
Claim 15
Dependent Claim
26 words
A method according to claim 10 , wherein said first and second control signals are switched to an active state at least partially coincident in time.
Claim 16
Dependent Claim
34 words
A method according to claim 10 , wherein said first and second control signals are switched to an active state before the start of the time slot which contains information of the received signal.
Claim 17
Dependent Claim
41 words
A method according to claim 10 , wherein for reducing of the offset voltage, to the output of said first separating means a second signal is connected which is formed on the basis of the first signal preceding said separating means.
Claim 18
Dependent Claim
15 words
The method of claim 10 , wherein said first and second control signals are identical.
Claim 19
Dependent Claim
14 words
A mobile station receiver operated in accordance with the method of claim 10 .
Claim 20
Dependent Claim
17 words
A mobile digital time division communication system operated in accordance with the method of claim 10 .
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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) | 2004-11-26 | 2005-05-28 | 2005-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-11-26 | 2009-05-28 | 2009-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-11-26 | 2013-05-28 | 2013-11-27 | $7700.00 | Window Closed / Lapsed |