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; 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 configured to be subtracted from a received signal to reduce noise in the receive band.
1 Assignment
0 Petitions
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.
40 Citations
20 Claims
-
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; 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 configured 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, 12)
-
-
13. A method, comprising:
-
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 (14, 15, 16, 17, 18)
-
-
19. An apparatus comprising:
-
means for amplifying a transmit signal in a transmit band and attenuating noise in a receive band to produce an 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 configured to be subtracted from a received signal to reduce noise in the receive band. - View Dependent Claims (20)
-
Specification