Transmitter with reduced spectral regrowth and associated methods
First Claim
1. A transmitter comprising:
- a monitoring circuit for monitoring phase transitions of in-phase and quadrature components of an input phase modulated signal;
a filter downstream from said monitoring circuit for generating a filtered phase modulated signal within an allocated bandwidth;
a transmit gain controller downstream from said filter for adjusting an amplitude of the filtered phase modulated signal based on a dynamic reference envelope control signal; and
a control circuit cooperating with said monitoring circuit and said transmit gain controller for generating the dynamic reference envelope control signal so that phase transitions are suppressed in the filtered phase modulated signal and so that the filtered phase modulated signal remains within the allocated bandwidth.
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Accused Products
Abstract
A transmitter includes a monitoring circuit for monitoring phase transitions of in-phase and quadrature components of an input phase modulated signal. A filter is downstream from the monitoring circuit for generating a filtered phase modulated signal within an allocated bandwidth. A transmit gain controller is downstream from the filter for adjusting an amplitude of the filtered phase modulated signal based on a dynamic reference envelope control signal. A control circuit cooperates with the monitoring circuit and the transmit gain controller for generating the dynamic reference envelope control signal so that phase transitions are suppressed in the filtered phase modulated signal and so that the filtered phase modulated signal remains within the allocated bandwidth.
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Citations
23 Claims
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1. A transmitter comprising:
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a monitoring circuit for monitoring phase transitions of in-phase and quadrature components of an input phase modulated signal; a filter downstream from said monitoring circuit for generating a filtered phase modulated signal within an allocated bandwidth; a transmit gain controller downstream from said filter for adjusting an amplitude of the filtered phase modulated signal based on a dynamic reference envelope control signal; and a control circuit cooperating with said monitoring circuit and said transmit gain controller for generating the dynamic reference envelope control signal so that phase transitions are suppressed in the filtered phase modulated signal and so that the filtered phase modulated signal remains within the allocated bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transmitter comprising:
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a monitoring circuit for monitoring phase transitions of in-phase and quadrature components of an input phase modulated signal; a filter downstream from said monitoring circuit for generating a filtered phase modulated signal within an allocated bandwidth; a transmit gain controller downstream from said filter for adjusting an amplitude of the filtered phase modulated signal to correspond with an amplitude of a dynamic reference envelope control signal, with the amplitude being adjusted to vary between a nominal value and a suppressed value, with the suppressed value corresponding to the phase transitions of the filtered phase modulated signal; and a control circuit cooperating with said monitoring circuit and said transmit gain controller for generating the dynamic reference envelope control signal with the nominal value or the suppressed value so that phase transitions are suppressed in the filtered phase modulated signal and so that the filtered phase modulated signal remains within the allocated bandwidth. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for suppressing a filtered phase modulated signal to be transmitted, the method comprising:
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monitoring phase transitions of in-phase and quadrature components of an input phase modulated signal with a monitoring circuit; generating a filtered phase modulated signal within an allocated bandwidth with a filter downstream from the monitoring circuit; adjusting an amplitude of the filtered phase modulated signal based on a dynamic reference envelope control signal with a transmit gain controller downstream from the filter; and generating the dynamic reference envelope control signal using a control circuit cooperating with the monitoring circuit and the transmit gain controller so that the phase transitions are suppressed in the filtered phase modulated signal and so that the filtered phase modulated signal remains within an allocated bandwidth. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification