Method and system for transmitting signals with reduced spurious emissions
First Claim
1. In a method of transmitting a signal based on a received analog input signal wherein the input signal is amplified for transmission via an antenna, the improvement comprising subdividing the input signal into a plurality of sub-bands, each sub-band containing a different spectral component of the input signal, up-converting and amplifying each sub-band, and then combining the amplified sub-bands for transmission via the antenna, wherein each sub-band'"'"'s relative amplitude and phase values are calibrated so that the combined signals approximate the input signal to be transmitted, wherein the calibration step further comprises making an initial relative amplitude and phase measurement, and then making subsequent amplitude only measurements using a swept CW signal for each sub-band to determine amplitude and phase corrections for each sub-band.
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Accused Products
Abstract
An RF power amplifier architecture minimizes spurious emissions by breaking the transmitted signal into narrow spectrum sub-bands, amplifying each separately, and then combining the signals for transmission purposes.
25 Citations
15 Claims
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1. In a method of transmitting a signal based on a received analog input signal wherein the input signal is amplified for transmission via an antenna, the improvement comprising subdividing the input signal into a plurality of sub-bands, each sub-band containing a different spectral component of the input signal, up-converting and amplifying each sub-band, and then combining the amplified sub-bands for transmission via the antenna, wherein each sub-band'"'"'s relative amplitude and phase values are calibrated so that the combined signals approximate the input signal to be transmitted, wherein the calibration step further comprises making an initial relative amplitude and phase measurement, and then making subsequent amplitude only measurements using a swept CW signal for each sub-band to determine amplitude and phase corrections for each sub-band.
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2. In a method of transmitting a signal based on a received analog input signal wherein the input signal is amplified for transmission via an antenna, the improvement comprising subdividing the input signal into a plurality of sub-bands, each sub-band containing a different spectral component of the input signal, up-converting and amplifying each sub-band, and then combining the amplified sub-bands for transmission via the antenna, wherein each sub-band'"'"'s relative amplitude and phase values are calibrated so that the combined signals approximate the input signal to be transmitted, wherein the calibration step further comprises generating a pair of CW signals and iteratively varying the relative amplitude and phases of the pair of CW signals until a summed output is minimized to determine the relative amplitude and phase values for the subdividing step.
- 3. In a method of transmitting a signal based on a received analog input signal wherein the input signal is amplified for transmission via an antenna, the improvement comprising subdividing the input signal into a plurality of sub-bands, each sub-band containing a different spectral component of the input signal, up-converting and amplifying each sub-band, and then combining the amplified sub-bands for transmission via the antenna, wherein each sub-band'"'"'s relative amplitude and phase values are calibrated so that the combined signals approximate the input signal to be transmitted, wherein the calibration step further comprises generating a test signal, amplifying the test signal and looping back the amplified signal to a receiver and modulator for measuring of the amplitude and phase of the looped back signal relative to the amplitude and phase of a signal corresponding to the analog input.
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5. In a method of transmitting a signal based on a received analog input signal wherein the input signal is amplified for transmission via an antenna, the improvement comprising subdividing the input signal into a plurality of sub-bands, each sub-band containing a different spectral component of the input signal, up-converting and amplifying each sub-band, and then combining the amplified sub-bands for transmission via the antenna, wherein each sub-band'"'"'s relative amplitude and phase values are calibrated so that the combined signals approximate the input signal to be transmitted, wherein the calibration step further comprises:
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providing a test signal, amplifying the test signal and transmitting the amplified test signal using a first transceiver to a second transceiver, determining the relative amplitude and phase values of the test signal by digitizing the test signal and transforming the digitized signal into sub-bands and amplifying the sub-bands, the second transceiver transmitting the determined relative amplitude and phase values to the first transceiver to set the amplitude and phase of the sub-bands for the subdividing step. - View Dependent Claims (6)
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7. In a transmitter system, wherein a received analog input signal is transmitted via an antenna using an up-converter and an amplifier, the improvement comprising:
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a processing module that converts the received analog input signal into a digital signal, parses the digitized signal into a plurality of sub-bands, calibrates the sub-bands, and converts each sub-band into an analog signal; an up-converter and amplifier for each sub-band, and a combiner to combine each amplified sub-band for transmission via the antenna. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A processing module for transmitting an analog input signal comprising:
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an analog to digital converter for digitizing the analog input signal; means for subdividing the digitized signal into a plurality of sub-bands and calibrating the sub-bands to account for amplitude and phase differences; a digital to analog converter for each sub-band, the output of each digital to analog converter adapted for later up-converting, amplification, and combining into one signal for transmission purposes; a detector adapted to receive a sample of the combined output signal of the amplified sub-bands, and to send the sample to the subdividing means as part of calibrating the sub-bands. - View Dependent Claims (15)
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Specification