Noise canceler for use in a transceiver
First Claim
1. An apparatus comprising:
- a split amplifier to amplify a transmit signal in a transmit band and attenuate noise in a receive band to produce an amplified transmit signal, the split amplifier comprising a driver amplifier to amplify the transmit signal to generate an amplified first signal, a first filter to filter the amplified first signal to attenuate signals in the receive band to provide a filtered amplified first signal, and a power amplifier to amplify the filtered amplified first signal to generate the amplified transmit signal; and
a feedback circuit coupled to the split amplifier to filter the amplified transmit signal to attenuate the transmit signal in the transmit band to produce a detection signal, the detection signal to be subtracted from a received signal to reduce noise in the receive band.
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Accused Products
Abstract
A noise canceler for use in a transceiver is disclosed. In an exemplary embodiment, an apparatus includes a split amplifier to output an amplified transmit signal, the split amplifier providing a first noise attenuation factor in a receive band. The apparatus also includes a transmit antenna to transmit the amplified transmit signal, the transmit antenna being isolated from a receive antenna by an antenna isolation factor that provides a second noise attenuation factor in the receive band. The apparatus also includes a noise canceler configured to subtract a detection signal from a received signal to obtain an adjusted received signal, wherein subtraction of the detection signal provides a third noise attenuation factor in the receive band, and wherein the first, second, and third noise attenuation factors combine to provide a selected amount of noise attenuation in the receive band.
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Citations
19 Claims
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1. An apparatus comprising:
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a split amplifier to amplify a transmit signal in a transmit band and attenuate noise in a receive band to produce an amplified transmit signal, the split amplifier comprising a driver amplifier to amplify the transmit signal to generate an amplified first signal, a first filter to filter the amplified first signal to attenuate signals in the receive band to provide a filtered amplified first signal, and a power amplifier to amplify the filtered amplified first signal to generate the amplified transmit signal; and a feedback circuit coupled to the split amplifier to filter the amplified transmit signal to attenuate the transmit signal in the transmit band to produce a detection signal, the detection signal to be subtracted from a received signal to reduce noise in the receive band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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amplifying a first signal in a transmit band to generate a second signal; filtering the second signal to attenuate signals in a receive band to generate a third signal; amplifying the third signal to generate a fourth signal; coupling the fourth signal to produce a fifth signal; filtering the fifth signal to attenuate signals in the transmit band to generate a sixth signal; receiving a seventh signal; and subtracting the sixth signal from the seventh signal to reduce noise in the receive band. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An apparatus comprising:
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means for amplifying a transmit signal in a transmit band and attenuating noise in a receive band to produce an amplified transmit signal, the means for amplifying a transmit signal comprising means for amplifying the transmit signal to generate an amplified first signal, means for filtering the amplified first signal to attenuate signals in the receive band to provide a filtered amplified first signal, and means for amplifying the filtered amplified first signal to generate the amplified transmit signal; and means for filtering the amplified transmit signal to attenuate the transmit signal in the transmit band to produce a detection signal, the detection signal to be subtracted from a received signal to reduce noise in the receive band. - View Dependent Claims (19)
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Specification