Apparatus for amplifying a signal using a digital processor
First Claim
1. An apparatus for amplifying a signal, the apparatus comprising:
- a digital processor including a digital logarithm converter, a shifter, and a digital inverse logarithm converter wherein the digital logarithm converter, the shifter, and the digital inverse logarithm converter effect an exponentiation operation, the digital processor producing a first digital signal and a second digital signal;
a pulse width modulator receiving the first digital signal and producing a pulse width modulated signal;
an amplitude restoration module responsive to the pulse width modulator, the amplitude restoration module producing an amplitude envelope signal;
a frequency upconverter receiving the second digital signal and producing a frequency modulated signal; and
a power amplifier responsive to the frequency upconverter and the amplitude restoration module, the power amplifier receiving the frequency modulated signal and the amplitude envelope signal and producing an amplified output signal.
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Accused Products
Abstract
An apparatus for amplifying a signal that includes a digital processor (12) producing a first digital signal (20) and a second digital signal (22), a pulse width modulator (32) receiving the first digital signal (20) and producing a pulse width modulated signal, an amplitude restoration module (37) responsive to the pulse width modulator (32), the amplitude restoration module (37) producing an amplitude envelope signal, a frequency upconverter (16) receiving the second digital signal (22) and producing a frequency modulated signal, and a power amplifier (18) responsive to the frequency upconverter and the amplitude restoration module (37). The power amplifier receives the frequency modulated signal and the amplitude envelope signal and produces an amplified output signal.
44 Citations
18 Claims
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1. An apparatus for amplifying a signal, the apparatus comprising:
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a digital processor including a digital logarithm converter, a shifter, and a digital inverse logarithm converter wherein the digital logarithm converter, the shifter, and the digital inverse logarithm converter effect an exponentiation operation, the digital processor producing a first digital signal and a second digital signal; a pulse width modulator receiving the first digital signal and producing a pulse width modulated signal; an amplitude restoration module responsive to the pulse width modulator, the amplitude restoration module producing an amplitude envelope signal; a frequency upconverter receiving the second digital signal and producing a frequency modulated signal; and a power amplifier responsive to the frequency upconverter and the amplitude restoration module, the power amplifier receiving the frequency modulated signal and the amplitude envelope signal and producing an amplified output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for amplifying a signal, the apparatus comprising:
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a digital processor including a digital logarithm converter, a shifter, and a digital inverse logarithm converter wherein the digital logarithm converter, the shifter, and the digital inverse logarithm converter effect an exponentiation operation, the digital processor having a first digital output and a second digital output; an amplitude restoration module responsive to the first output of the digital processor, the amplitude restoration module having an amplitude signal output; a frequency upconverter responsive to the second digital output of the digital processor and having a frequency modulated output; and a power amplifier having a first input responsive to the frequency modulated output of the frequency upconverter and a second input responsive to the amplitude signal output of the amplitude restoration module, the power amplifier further comprising an amplifier output. - View Dependent Claims (16, 17, 18)
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Specification