POLAR MODULATION TRANSMISSION APPARATUS AND POLAR MODULATION TRANSMISSION METHOD

• US 20090258611A1
• Filed: 04/09/2009
• Published: 10/15/2009
• Est. Priority Date: 04/10/2008
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: ISHIDA, Kaoru, NAKAMURA, Maki
• Granted Patent: US 8,369,802 B2
• Time in Patent Office: Days
• US Class Current: 455/108
• CPC Class Codes: H03C 5/00 Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal H03C7/00 takes precedence
• CPC Class Codes: H03F 1/0222 by using a signal derived from the input signal
• CPC Class Codes: H03F 2200/447 the amplifier being protected to temperature influence
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence

Abstract

The polar modulation apparatus of the present invention can control the output power of a transmission signal over a wide range and compensate characteristic degradation reliably upon temperature change. Polar modulation transmission apparatus 100 is provided with: temperature sensor 120; temperature compensation section 1601 that corrects an amplitude signal and performs temperature compensation for transmission power amplification section 190; temperature compensation section 160-2 that corrects a power amplification signal and performs temperature compensation for power adjustment section 180; and correction value setting section 130 that sets correction values for temperature compensation section 160-1 and temperature compensation section 160-2, and, while only the amplitude signal is corrected according to a measurement result in temperature sensor 120 in the first mode, the amplitude signal and the power adjustment signal are corrected according to a measurement result in the second mode.

Claims

1. A polar modulation transmission apparatus comprising:

a power adjustment section that adjusts a power level of a high frequency phase modulation signal of a modulation signal based on a power adjustment signal;

a transmission power amplification section that has a first mode for allowing an operation as a non-linear amplifier and a second mode for allowing an operation as a linear amplifier, and, using an amplitude signal of the modulation signal as a power supply voltage, amplifies the high frequency phase modulation signal and outputs a transmission signal;

a temperature detection section that measures a temperature near the transmission power amplification section;

a first temperature compensation section that corrects the amplitude signal and performs temperature compensation for the transmission power amplification section; and

a second temperature compensation section that corrects the power adjustment signal and performs temperature compensation for the power adjustment section,

wherein, in the first mode, only the first temperature compensation section performs temperature compensation according to a measurement result in the temperature detection section, and, in the second mode, the first temperature compensation section and the second temperature compensation section perform temperature compensation according to the measurement result in the temperature detection section.

2. The polar modulation transmission apparatus according to claim 1, further comprising a correction value setting section that holds tables associating temperatures and correction values for the first mode and the second mode, and that determines a correction value for the amplitude signal and a correction value for the power adjustment signal with reference to the tables.

3. The polar modulation transmission apparatus according to claim 1, further comprising a correction value setting section that calculates a correction value for the amplitude signal and a correction value for the power adjustment signal using the measurement result in the temperature detection section.

4. The polar modulation transmission apparatus according to claim 1, wherein the power adjustment section comprises a variable gain amplifier as an element to adjust the power level of the high frequency phase modulation signal.

5. The polar modulation transmission apparatus according to claim 1, wherein the power adjustment section comprises a variable gain attenuator as an element to adjust the power level of the high frequency phase signal.

6. The polar modulation transmission apparatus according to claim 1, wherein the power adjustment section comprises a variable gain amplifier and a variable gain attenuator connected after the variable gain amplifier, as elements to adjust the power level of the high frequency phase modulation signal.

7. The polar modulation transmission apparatus according to claim 1, wherein the power adjustment section comprises a variable gain attenuator and a variable gain amplifier connected after the variable gain attenuator, as elements to adjust the power level of the high frequency phase modulation signal.

8. A polar modulation transmission method comprising the steps of:

adjusting a power level of a high frequency phase modulation signal of a modulation signal based on a power adjustment signal;

where a first mode allows an operation as a non-linear amplifier and a second mode allows an operation as a linear amplifier, amplifying the high frequency phase modulation signal and outputting a transmission signal using an amplitude signal of the modulation signal as a power supply voltage;

measuring a temperature of a place from which the transmission power is outputted;

correcting only the amplitude signal according to the measured temperature in the first mode; and

correcting the amplitude signal and the power adjustment signal according to the measured temperature in the second mode.

9. The polar modulation transmission method according to claim 8, further comprising a step of setting a correction value of the amplitude signal and a correction value of the power adjustment signal according to the temperature measured in the step of measuring the temperature.