Control device for power amplifier

• US 5,363,057 A
• Filed: 01/22/1993
• Issued: 11/08/1994
• Est. Priority Date: 01/30/1992
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Furuno, Kenichi
• Primary Examiner(s): Mullins, James B.
• Application Number:
  US08/007,966
• Time in Patent Office: 655 Days
• Field of Search: 330/127, 330/129, 330/138, 330/278, 330/279, 330/280, 330/289, 455/116, 455/126, 455/127
• US Class Current: 330/129
• CPC Class Codes: H03F 1/30 Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in differential amplifiers H03F3/45479
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04

Abstract

A control device for a power amplifier controls the power amplifier upon a rise in output power based on a power variation pattern stored in storage means to suppress a power overshoot which occurs upon a rise in output power.

Claims

1. A control device for regulating the output power of a power amplifier at a continuous level from among different selected power levels, said control device comprising a detector for detecting the output power of said power amplifier and differential amplifying means for generating a control signal equivalent to the difference between the output of said detector and the output of reference voltage generating means representing a selected power level to control the power level of said amplifier at said selected power level, said control device further comprising storage means for storing a reference power level signal variation pattern representing a variation in reference power level as a function of time for changing the power level of said amplifier in accordance with said function of time from one selected continuous level to another selected continuous level and a control section for changing said control signal as a function of time based on the reference power level signal variation pattern stored in said storage means.

2. A control device for a power amplifier according to claim 1, wherein said control section controls said amplifier upon a rise in output power level.

3. A control device for a power amplifier according to claim 1, wherein said control section controls said amplifier upon a fall in output power level.

4. A control device for a power amplifier according to claim 1, wherein said control section controls said amplifier upon switching of output power level.

5. A control device for a power amplifier according to claim 1, wherein said control section changes the control signal by varying the input of said reference voltage generating means.

6. A control device for a power amplifier according to claim 1, wherein said control section changes the control signal by varying the output of said differential amplifying means.

7. A control device for regulating the output power of a power amplifier at a continuous level from among different selected power levels, said control device comprising a detector for detecting the output power of said power amplifier and differential amplifying means for generating a control signal equivalent to the difference between the output of said output detector and the output of a reference voltage generator means representing a selected power level to control the power level of said amplifier at said selected power level, said control device further comprising storage means for storing a reference power level signal variation pattern representing a variation in reference power level as a function of time for changing the power level of said amplifier in accordance with said function of time from one selected continuous level to another selected continuous level and a control section for changing said control signal as a function of time based on the reference power level signal variation pattern stored in said storage means and a low-pass filter provided on the output side of said reference voltage generating means.

8. A control device for regulating the output power of a power amplifier at a continuous level from among different selected power levels, said control device comprising a detector for detecting the output power of said power amplifier and differential amplifying means for generating a control signal equivalent to the difference between the output of said output detector and the output of a reference voltage generator means representing a selected power level to control the power level of said amplifier at said selected power level, said control device further comprising storage means for storing a reference power level signal variation pattern representing a variation in reference power level as a function of time for changing the power level of said amplifier in accordance with said function of time from one selected continuous level to another selected continuous level, a control section for changing said control signal as a function of time based on the reference power level signal variation pattern stored in said storage means, and a temperature detection section for detecting ambient temperature, and a temperature correction section for correcting the output of said control section based on the output of said temperature detector.

9. A control device for regulating the output power of a power amplifier at a continuous level from among different selected power levels, said control device comprising a detector for detecting the output power of said power amplifier and differential amplifying means for generating a control signal equivalent to the difference between the output of said output detector and the output of a reference voltage generator means representing a selected power level to control the power level of said amplifier at said selected power level, said control device further comprising storage means for storing a reference power level signal variation pattern representing a variation in reference power level as a function of time for changing the power level of said amplifier in accordance with said function of time from one selected continuous level to another selected continuous level, a control section for changing said control signal as a function of time based on the reference power level signal variation pattern stored in said storage means, and a frequency correction section for correcting the output of said control section based on a frequency band of a circuit used in said power amplifier.