US5812942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced differential radio receiver and method of operation
Assignee: Motorola Solutions Inc
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Filing: 1996-09-24
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Granted: 1998-09-22
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Expires: 2016-09-24
Abstract
Abstract A balanced differential radio receiver (100) has an antenna (64) operative for receiving a modulated signal. A first pair of mixers (110, 112) each having an input that receives an output (106, 108) of the antenna (64) and each of the first pair of mixers (110, 112) having an output (118, 120). A second pair of mixers (114, 116) each having an input that receives an inverse output (108, 106) of the antenna (64). A resistive adding circuit (122, 124) having a pair of inputs (118, 120). The inputs (118, 120) coupled to the output of the first pair of mixers (110, 112).
Inventors
- 👤 Steven Pater Allen
- 👤 William Chunhung Yip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:51
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/233; H04L27/2332; G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/0723; H01; H01Q; H01Q7/00; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/30; H04L27/02; H04L27/06
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
162 words
A balanced differential radio receiver, comprising: an antenna receiving a radio frequency signal; a first in-phase mixer having an input coupled to a first polarity signal from the antenna, the first in-phase mixer having a first in-phase signal as an output; a first quadrature phase mixer having an input coupled to the first polarity signal from the antenna, the first quadrature phase mixer having a first quadrature signal as an output; a second in-phase mixer having an input coupled to a second polarity signal from the antenna, the second in-phase mixer having a second in-phase signal as an output; a second quadrature phase mixer having an input coupled to the second polarity signal from the antenna, the second quadrature phase mixer having a second quadrature signal as an output; a first resistive network having as inputs the first in-phase signal and the first quadrature signal; and a second resistive network having as inputs the second in-phase signal and the second quadrature signal.
Claim 2
Dependent Claim
162 words
A balanced differential radio receiver, comprising: an antenna receiving a radio frequency signal; a first in-phase mixer having an input coupled to a first polarity signal from the antenna, the first in-phase mixer having a first in-phase signal as an output; a first quadrature phase mixer having an input coupled to the first polarity signal from the antenna, the first quadrature phase mixer having a first quadrature signal as an output; a second in-phase mixer having an input coupled to a second polarity signal from the antenna, the second in-phase mixer having a second in-phase signal as an output; a second quadrature phase mixer having an input coupled to the second polarity signal from the antenna, the second quadrature phase mixer having a second quadrature signal as an output; a first resistive network having as inputs the first in-phase signal and the first quadrature signal; and a second resistive network having as inputs the second in-phase signal and the second quadrature signal.
Claim 3
Dependent Claim
31 words
The radio receiver of claim 1, further including a quadrant detector coupled to the first in-phase signal and the first quadrature signal, the quadrant detector controlling an in-phase local oscillator signal.
Claim 4
Dependent Claim
17 words
The radio receiver of claim 2, wherein the radio frequency signal is an amplitude shift keyed signal.
Claim 5
Dependent Claim
17 words
The radio receiver of claim 2, wherein the radio frequency signal is a bi-phase shift keyed signal.
Claim 6
Dependent Claim
12 words
The radio receiver of claim 1, further including a differential amplification circuit.
Claim 7
Dependent Claim
15 words
The radio receiver of claim 5, wherein the differential amplification circuit attenuates high frequency signals.
Claim 8
Dependent Claim
95 words
A balanced differential radio receiver, comprising: an antenna for receiving a modulated signal; a first pair of mixers, each of the first pair of mixers having an input that receives an output of the antenna and each of the first pair of mixers having an output; a second pair of mixers, each of the second pair of mixers having an input that receives an inverse output of the antenna; and a resistive adding circuit having a pair of inputs, each of the pair of inputs coupled to the output of the first pair of mixers.
Claim 9
Dependent Claim
95 words
A balanced differential radio receiver, comprising: an antenna for receiving a modulated signal; a first pair of mixers, each of the first pair of mixers having an input that receives an output of the antenna and each of the first pair of mixers having an output; a second pair of mixers, each of the second pair of mixers having an input that receives an inverse output of the antenna; and a resistive adding circuit having a pair of inputs, each of the pair of inputs coupled to the output of the first pair of mixers.
Claim 10
Dependent Claim
13 words
The radio receiver of claim 7, wherein the antenna is an inductive coil.
Claim 11
Dependent Claim
29 words
The radio receiver of claim 7, further including a quadrant detector circuit controlling a local oscillator signal that forms an input to one of the first pair of mixers.
Claim 12
Dependent Claim
34 words
The radio receiver of claim 7, further including a second resistive adding circuit having a pair of inputs, each of the pair of inputs coupled to the output of the second pair of mixers.
Claim 13
Dependent Claim
41 words
The radio receiver of claim 10, further including a differential amplifier, the differential amplifier having a first input connected to an output of the resistive adding network and a second input connected to an output of the second resistive adding network.
Claim 14
Dependent Claim
20 words
The radio receiver of claim 11, wherein the differential amplifier has a feedback signal and is an unconditionally stable circuit.
Claim 15
Dependent Claim
19 words
The radio receiver of claim 11, wherein the differential amplifier has a frequency response that attenuates high frequency signals.
Claim 16
Dependent Claim
15 words
The radio receiver of claim 11, wherein the differential amplifier has a low input current.
Claim 17
Dependent Claim
21 words
The radio receiver of claim 11, further including an open loop differential amplifier coupled to an output of the differential amplifier.
Claim 18
Dependent Claim
16 words
The radio receiver of claim 15, wherein the modulated signal is an amplitude shift keyed signal.
Claim 19
Dependent Claim
16 words
The radio receiver of claim 15, wherein the modulated signal is a bi-phase shift keyed signal.
Claim 20
Independent Claim
146 words
A method of operating a radio receiver, comprising the steps of: (a) receiving a radio frequency modulated signal to form a modulated signal; (b) mixing a first polarity of the modulated signal with an in-phase signal, to form a first in-phase signal; (c) mixing the first polarity of the modulated signal with a quadrature phase signal, to form a first quadrature signal; (d) mixing a second polarity of the modulated signal with the in-phase signal, to form a second in-phase signal; (e) mixing the second polarity of the modulated signal with the quadrature phase signal, to form a second quadrature signal; (f) resistively adding the first in-phase signal with the first quadrature signal, to form a first signal; (g) resistively adding the second in-phase signal with the second quadrature signal, to form a second signal; and (h) differentially amplifying the first signal and the second signal.
Claim 21
Independent Claim
146 words
A method of operating a radio receiver, comprising the steps of: (a) receiving a radio frequency modulated signal to form a modulated signal; (b) mixing a first polarity of the modulated signal with an in-phase signal, to form a first in-phase signal; (c) mixing the first polarity of the modulated signal with a quadrature phase signal, to form a first quadrature signal; (d) mixing a second polarity of the modulated signal with the in-phase signal, to form a second in-phase signal; (e) mixing the second polarity of the modulated signal with the quadrature phase signal, to form a second quadrature signal; (f) resistively adding the first in-phase signal with the first quadrature signal, to form a first signal; (g) resistively adding the second in-phase signal with the second quadrature signal, to form a second signal; and (h) differentially amplifying the first signal and the second signal.
Claim 22
Dependent Claim
26 words
The method of claim 18, wherein step (h) further includes the step of filtering a high frequency component of the first signal and the second signal.
Claim 23
Dependent Claim
48 words
The method of claim 18, wherein step (c) further includes the step of determining a quadrant of the first polarity of the modulated signal and reversing the polarity of the in-phase signal when the first polarity of the modulated signal is not in a first or third quadrant.
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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) | 2001-09-21 | 2002-03-23 | 2002-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-21 | 2006-03-23 | 2006-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-21 | 2010-03-23 | 2010-09-22 | $7700.00 | Window Closed / Lapsed |