Multiple step switched translation loop for power amplifier feedback control
First Claim
1. A method for using a translation loop modulator and power amplifier in a phase and amplitude modulated transmission environment, comprising the steps of:
- providing a phase modulated signal to a translation loop, the translation loop providing a frequency specific phase modulated signal, the translation loop also having a phase locked loop;
providing said frequency specific phase modulated signal to a power amplifier;
providing an amplitude modulated signal to the power amplifier using a variable gain element associated with a control loop;
detecting a portion of an output of the translation loop and a portion of an output power of the power amplifier;
applying the detected output portion of the translation loop to an input of the translation loop during a first time period; and
applying the detected output power portion of the power amplifier to the input of the translation loop modulator during a second time period, wherein the detected output power portion of the power amplifier that is supplied during the second time period is a substantially constant power level signal containing only phase information.
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Abstract
A translation loop modulator and power amplifier in a phase and amplitude modulated transmission environment includes a translation loop having a phase locked loop and that is configured to receive a first modulated signal (PM) and that is also configured to provide a frequency specific modulated signal. The invention also includes a power amplifier configured to receive the frequency specific modulated signal, a variable gain element configured to provide a second modulated signal (AM) to the power amplifier and a switching element configured to receive a portion of an output of the translation loop and a portion of an output power of the power amplifier. The switching element is configured to apply the output portion of the translation loop to an input of the translation loop during a first time period and apply the detected output power portion of the power amplifier to the input of the translation loop during a second time period, thus allowing the phase locked loop in the translation loop to correct for any phase shift caused by the power amplifier.
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Citations
32 Claims
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1. A method for using a translation loop modulator and power amplifier in a phase and amplitude modulated transmission environment, comprising the steps of:
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providing a phase modulated signal to a translation loop, the translation loop providing a frequency specific phase modulated signal, the translation loop also having a phase locked loop;
providing said frequency specific phase modulated signal to a power amplifier;
providing an amplitude modulated signal to the power amplifier using a variable gain element associated with a control loop;
detecting a portion of an output of the translation loop and a portion of an output power of the power amplifier;
applying the detected output portion of the translation loop to an input of the translation loop during a first time period; and
applying the detected output power portion of the power amplifier to the input of the translation loop modulator during a second time period, wherein the detected output power portion of the power amplifier that is supplied during the second time period is a substantially constant power level signal containing only phase information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for using a translation loop and power amplifier in a phase and amplitude modulated transmission environment, comprising:
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a translation loop having a phase locked loop and configured to receive a phase modulated signal, the translation loop also configured to provide a frequency specific phase modulated signal;
a power amplifier configured to receive the frequency specific phase modulated signal;
a control loop having a variable gain element configured to provide an amplitude modulated signal to the power amplifier;
a switching element configured to receive a portion of an output of the translation loop and a portion of an output power of the power amplifier, the switching element configured to apply the output portion of the translation loop to an input of the translation loop during a first time period and configured to apply the detected output power portion of the power amplifier to the input of the translation loop during a second time period, wherein the detected output power portion of the power amplifier that is supplied during the second time period is a substantially constant power level signal containing only phase information. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A computer readable medium having a program for using a translation loop modulator and power amplifier in a phase and amplitude modulated transmission environment, the program comprising logic configured to perform the steps of:
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providing a phase modulated signal to a translation loop, the translation loop providing a frequency specific phase modulated signal, the translation loop also having a phase locked loop;
providing said frequency specific phase modulated signal to a power amplifier;
providing an amplitude modulated signal to the power amplifier using a variable gain element associated with a control loop;
detecting a portion of an output of the translation loop and a portion of an output power of the power amplifier;
applying the detected output portion of the translation loop to an input of the translation loop during a first time period; and
applying the detected output power portion of the power amplifier to the input of the translation loop modulator during a second time period, wherein the detected output power portion of the power amplifier that is supplied during the second time period is a substantially constant power level signal containing only phase information. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A power amplifier including a translation loop modulator, comprising:
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means for providing a phase modulated signal to a translation loop, the translation loop providing a frequency specific phase modulated signal, the translation loop also having a phase locked loop;
means for providing said frequency specific phase modulated signal to a power amplifier;
means for providing an amplitude modulated signal to the power amplifier using a variable gain element associated with a control loop;
means for detecting a portion of an output of the translation loop and a portion of an output power of the power amplifier;
means for applying the detected output portion of the translation loop to an input of the translation loop during a first time period; and
means for applying the detected output power portion of the power amplifier to the input of the translation loop modulator during a second time period, wherein the detected output power portion of the power amplifier that is supplied during the second time period is a substantially constant power level signal containing only phase information. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification