Apparatus and method for interference canceller in a high frequency receiver and transmitter
First Claim
1. A high frequency receiver provided in a same housing as a housing including a transmitter having a transmission signal generation part, having a frequency band of a receive signal in a vicinity of a frequency of a carrier wave of a transmission signal generated by the transmission signal generation part, and to which a high frequency signal including the receive signal and a transmission signal released from a transmitting antenna of the transmitter is inputted via an antenna,the high frequency receiver comprising:
- an antenna input terminal to which the high frequency signal is inputted;
a mixer having a first input terminal to which the high frequency signal inputted to the antenna input terminal is inputted and a second input terminal to which an output signal from a local oscillator is inputted; and
an output terminal to which an output signal from the mixer is inputted,wherein the high frequency receiver comprisesa distributed transmission signal input terminal to which at least a part of a distributed transmission signal obtained by distributing the transmission signal is inputted in the housing;
a phase shifter to which the distributed transmission signal inputted to the distributed transmission signal input terminal is inputted;
a detector for detecting a level of the transmission signal included in the distributed receive signal obtained by distributing the high frequency signal; and
a level regulator having a first regulator input terminal to which an output from the detector is coupled and a second regulator input terminal to which the distributed transmission signal is inputted, andthe level regulator changes a level of the distributed transmission signal in accordance with an output signal from the detector, and a signal input via the level regulator and the phase shifter and the high frequency signal are synthesized to be inputted to the mixer.
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Accused Products
Abstract
A high frequency receiver capable of stably canceling interference by a transmission signal even if a transmission signal input from a TV antenna is changed. Phase shifter (212) for changing a phase of an interfering distributed transmission signal, detector (216) for detecting a level of a transmission signal included in a receive signal input via an antenna, and level regulator (213) for changing a level of the distributed transmission signal in accordance with this level are provided. A signal input via level regulator (213) and phase shifter (212) and a receive signal are synthesized to be input into mixer (206). Since a transmission signal can be cancelled even if a transmission signal input from an antenna is changed, a high frequency receiver can receive a signal stably when a transmission signal is changed.
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Citations
30 Claims
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1. A high frequency receiver provided in a same housing as a housing including a transmitter having a transmission signal generation part, having a frequency band of a receive signal in a vicinity of a frequency of a carrier wave of a transmission signal generated by the transmission signal generation part, and to which a high frequency signal including the receive signal and a transmission signal released from a transmitting antenna of the transmitter is inputted via an antenna,
the high frequency receiver comprising: -
an antenna input terminal to which the high frequency signal is inputted; a mixer having a first input terminal to which the high frequency signal inputted to the antenna input terminal is inputted and a second input terminal to which an output signal from a local oscillator is inputted; and an output terminal to which an output signal from the mixer is inputted, wherein the high frequency receiver comprises a distributed transmission signal input terminal to which at least a part of a distributed transmission signal obtained by distributing the transmission signal is inputted in the housing; a phase shifter to which the distributed transmission signal inputted to the distributed transmission signal input terminal is inputted; a detector for detecting a level of the transmission signal included in the distributed receive signal obtained by distributing the high frequency signal; and a level regulator having a first regulator input terminal to which an output from the detector is coupled and a second regulator input terminal to which the distributed transmission signal is inputted, and the level regulator changes a level of the distributed transmission signal in accordance with an output signal from the detector, and a signal input via the level regulator and the phase shifter and the high frequency signal are synthesized to be inputted to the mixer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An integrated circuit, comprising:
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an antenna input terminal to which a high frequency signal is inputted; a mixer having a first input terminal to which the high frequency signal inputted to the antenna input terminal is coupled and a second input terminal to which an output signal from a local oscillator is inputted; an output terminal to which an output signal from the mixer is inputted; and a PLL circuit loop-coupled to the local oscillator, wherein the integrated circuit for the high frequency receiver comprises; a distributed transmission signal input terminal, a phase shifter to which a distributed transmission signal inputted to the distributed transmission signal is inputted, a detector for detecting a level of the transmission signal included in a distributed receive signal obtained by distributing the high frequency signal, and a level regulator having a first regulator input terminal to which an output terminal of the detector is coupled and a second regulator input terminal to which the distributed transmission signal is inputted, and the level regulator changes the level of the distributed transmission signal in accordance with the output from the detector and outputs a signal to be inputted via the level regulator and the phase shifter. - View Dependent Claims (30)
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Specification