Transmitter circuitry for a cellular phone
First Claim
1. A cellular phone for a mobile communications system, said phone being operable at a first radio frequency band and a second radio frequency band, said phone comprising a dual band transmitter and an antenna, said dual band transmitter comprising:
- a first amplifier, said first amplifier having a first input for a first signal at said first radio frequency, and a first output for an amplified first signal, said first output being connectable to said antenna via a first signal path;
a second amplifier, said second amplifier having a second input for a second signal at said second radio frequency band and a second output for an amplified second signal, said second output being connectable to said antenna via a second signal path; and
a filter module, said filter module being associated with the first and second signal paths and configured to receive a control signal which selectively operates the filter module at one of a first and second filter characteristics to selectively block undesired frequencies, wherein said first and second filter characteristics are selectable using shared filter components.
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Accused Products
Abstract
A cellular phone for a mobile communications system includes a dual band transmitter which operates at a first radio frequency band and a second radio frequency band. The dual band transmitter includes two amplifiers. The first amplifier has a first input for a first signal at the first radio frequency band, and a first output for an amplified first signal. The first output is connectable to the antenna via a first signal path. The second amplifier has a second input for a second signal at the second radio frequency band and a second output for an amplified second signal. The second output is connectable to the antenna via a second signal path. A filter module is associated with the first and second signal paths and configured to receive a control signal which controls the filter module to have one of a first and second cut-off frequencies.
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Citations
17 Claims
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1. A cellular phone for a mobile communications system, said phone being operable at a first radio frequency band and a second radio frequency band, said phone comprising a dual band transmitter and an antenna, said dual band transmitter comprising:
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a first amplifier, said first amplifier having a first input for a first signal at said first radio frequency, and a first output for an amplified first signal, said first output being connectable to said antenna via a first signal path;
a second amplifier, said second amplifier having a second input for a second signal at said second radio frequency band and a second output for an amplified second signal, said second output being connectable to said antenna via a second signal path; and
a filter module, said filter module being associated with the first and second signal paths and configured to receive a control signal which selectively operates the filter module at one of a first and second filter characteristics to selectively block undesired frequencies, wherein said first and second filter characteristics are selectable using shared filter components.
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2. A wireless phone for a mobile communications system, said phone being operable at at least a first radio frequency band and a second radio frequency band said phone comprising a transmitter and an antenna, said transmitter comprising:
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a first amplifier, said first amplifier having a first input for a first signal at said first radio frequency, and a first output for an amplified first signal, said first output being connectable to said antenna via a first signal path;
a second amplifier, said second amplifier having a second input for a second signal at said second radio frequency band and a second output for an amplified second signal, said second output being connectable to said antenna via a second signal path; and
a filter module, said filter module being associated with the first and second signal paths and configured to receive a control signal which selectively operates the filter module at one of at least first and second filter characteristics to selectively block undesired frequencies, wherein said first and second filter characteristics are selectable using shared filter components. - View Dependent Claims (3, 4, 5, 6)
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7. A transmitter for a wireless phone comprising an antenna and being operable at at least a first radio frequency band and a second radio frequency band, said transmitter comprising:
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a first amplifier, said first amplifier having a first input for a first signal at said first radio frequency, and a first output for an amplified first signal, said first output being connectable to said antenna via a first signal path;
a second amplifier, said second amplifier having a second input for a second signal at said second radio frequency band and a second output for an amplified second signal, said second output being connectable to said antenna via a second signal path; and
a filter module, said filter module being associated with the first and second signal paths and configured to receive a control signal which selectively operates the filter module at one of at least a first and second filter characteristics to selectively block undesired frequencies, wherein said first and second filter characteristics are selectable using shared filter components. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An amplifier module comprising:
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a first amplifier, said first amplifier having a first input for a first signal at said first radio frequency, and a first output for an amplified first signal, said first output being connectable to said antenna via a first signal path;
a second amplifier, said second amplifier having a second input for a second signal at said second radio frequency band and a second output for an amplified second signal, said second output being connectable to said antenna via a second signal path; and
a filter module, said filter module being associated with the first and second signal paths and configured to receive a control signal which selectively operates the filter module at one of at least a first and second filter characteristics to selectively block undesired frequencies, wherein said first and second filter characteristics are selectable using shared filter components. - View Dependent Claims (14, 15)
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16. A method for filtering radio frequency signals in a wireless phone, comprising the steps of:
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providing a transmitter comprising a filter amplifier configured to amplify signals at a first frequency band, and a second amplifier configured to amplify signals at a second frequency band, said first and second amplifiers being coupled to an antenna;
activating one of said first and second amplifiers;
feeding a signal to said activated amplifier;
amplifying said signal with said activated amplifier;
feeding said amplified signal to a filter module, said filter module having at least two filter characteristics defined for said first and second frequency bands;
controlling said filter module to select one of said at least two filter characteristics implemented in said filter module, said selected filter characteristic blocking undesired frequencies outside a frequency band of said signal fed to the activated amplifier, wherein said filter characteristics are selectable using shared filter components; and
feeding said filtered signal to said antenna. - View Dependent Claims (17)
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Specification