Programmable transmitter architecture for non-constant and constant envelope modulation
First Claim
1. A programmable transmitter comprising:
- a programmable frequency synthesizer adapted to generate a local oscillator carrier frequency;
a plurality of transmitter components;
a microcontroller coupled to the frequency synthesizer and to the plurality of transmitter components;
a digital baseband interface adapted to receive digital data to be transmitted; and
a pulse-shaping filter coupled between the frequency synthesizer and the digital baseband interface;
wherein the plurality of transmitter components includes;
a digital-to-analog converter coupled to the digital baseband interface and adapted to receive the digital data and to convert the digital data into I and Q analog data signals; and
a quadrature mixer coupled to the digital-to-analog converter and adapted to receive the I and Q analog data signals from the digital-to-analog converter, and also coupled to the frequency synthesizer and configured to receive the local oscillator carrier frequency from the frequency synthesizer, the quadrature mixer being configured to combine the local oscillator carrier frequency and the I and Q analog data signals to provide a radio frequency data signal from transmission;
wherein the microcontroller is configured to provide a frequency control signal to the frequency synthesizer to control a frequency of the local oscillator carrier frequency,wherein the microcontroller is further configured to provide digital control signals to at least some of the plurality of transmitter components to turn on and off different ones of the plurality of transmitter components based on an operating mode of the transmitter, such that the transmitter can accommodate both constant envelope modulation and non-constant envelope modulation schemes; and
wherein the microcontroller is configured to provide the digital control signals to the pulse-shaping filter to turn off the pulse-shaping filter.
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Accused Products
Abstract
Transmitter architectures designed to accommodate both constant and non-constant of envelope modulation schemes and capable of providing local oscillator carrier frequencies within any one of numerous desired frequency bands, thus allowing compliance with many different communication standards. One example of a programmable frequency synthesizer includes a plurality of transmitter components and a microcontroller coupled to the frequency synthesizer and to the plurality of transmitter components. The microcontroller is adapted to provide a frequency control signal to the frequency synthesizer to control a frequency of the local oscillator carrier frequency. In addition, the microcontroller is also adapted to provide digital control signals to at least some of the plurality of transmitter components to turn on and off different ones of the plurality of transmitter components based on an operating mode of the transmitter, such that the transmitter can accommodate both constant envelope modulation and non-constant envelope modulation schemes.
229 Citations
19 Claims
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1. A programmable transmitter comprising:
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a programmable frequency synthesizer adapted to generate a local oscillator carrier frequency; a plurality of transmitter components; a microcontroller coupled to the frequency synthesizer and to the plurality of transmitter components; a digital baseband interface adapted to receive digital data to be transmitted; and a pulse-shaping filter coupled between the frequency synthesizer and the digital baseband interface; wherein the plurality of transmitter components includes; a digital-to-analog converter coupled to the digital baseband interface and adapted to receive the digital data and to convert the digital data into I and Q analog data signals; and a quadrature mixer coupled to the digital-to-analog converter and adapted to receive the I and Q analog data signals from the digital-to-analog converter, and also coupled to the frequency synthesizer and configured to receive the local oscillator carrier frequency from the frequency synthesizer, the quadrature mixer being configured to combine the local oscillator carrier frequency and the I and Q analog data signals to provide a radio frequency data signal from transmission; wherein the microcontroller is configured to provide a frequency control signal to the frequency synthesizer to control a frequency of the local oscillator carrier frequency, wherein the microcontroller is further configured to provide digital control signals to at least some of the plurality of transmitter components to turn on and off different ones of the plurality of transmitter components based on an operating mode of the transmitter, such that the transmitter can accommodate both constant envelope modulation and non-constant envelope modulation schemes; and wherein the microcontroller is configured to provide the digital control signals to the pulse-shaping filter to turn off the pulse-shaping filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A frequency synthesizer comprising:
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a plurality of voltage controlled oscillators; a filter having an input coupled to a first terminal of a switch and an output coupled to a multiplexer; a first divider having an input coupled to the first terminal of the switch and an output coupled to the multiplexer; and a second divider having an input coupled to the first terminal of the switch and an output coupled to the multiplexer; wherein the switch is operable to select an output of one of the plurality of voltage controlled oscillators and to couple the selected voltage controlled oscillator output to the first terminal of the switch; and wherein the multiplexer is configured to provide a local oscillator carrier signal provided by the selected voltage controlled oscillator output. - View Dependent Claims (17, 18, 19)
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Specification