Power controller

• US 6,980,780 B2
• Filed: 05/16/2001
• Issued: 12/27/2005
• Est. Priority Date: 03/26/2001
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Chen, Chieh-Sheng, Su, Keng-Li
• Primary Examiner(s): LE, LANA N
• Application Number:
  US09/855,511
• Publication Number:
  US 20020137481A1
• Time in Patent Office: 1,686 Days
• Field of Search: 455/127.2, 455/127.3, 455/127.1, 455/115.1, 455/115.3, 455/522, 455/343.1, 455/343.2, 455/343.5, 455/127.5, 455/115.4, 455/571, 330/51, 330/124.D, 330/296
• US Class Current: 455/127.1
• CPC Class Codes: H03F 3/19 with semiconductor devices only
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H04B 2001/0416 having gain or transmission power control

Abstract

An apparatus for power controlling in a transmitter for detecting the output power without using a power coupler includes a plurality of stage amplifiers, a plurality of matching circuits, at least one power detector, and a bias control circuit. The stage amplifiers receive an emission signal and amplify the power thereof. The matching circuits are connected between the stage amplifiers for matching with the stage amplifiers, respectively. The power detector detects the power of the stage amplifiers and generates detection signals, respectively. The bias control circuit receives the detection signals of the power detector, thereby generating a bias of each of the stage amplifiers in order to optimize the efficiency of each of the stage amplifiers according to the magnitude of the power of each of the stage amplifiers.

Claims

1. An apparatus for power controlling in a transmitter for receiving an emission signal and outputting to an antenna, comprising:

a plurality of stage amplifiers for receiving the emission signal and amplifying the power thereof;

a plurality of matching circuits connected between the stage amplifiers for matching with the stage amplifiers, respectively;

at least one power detector for detecting the power of the at least one stage amplifier and generating detection signal; and

a bias control circuit for receiving the detection signal of the at least one power detector, thereby generating a bias of each of the stage amplifiers in order to optimize the efficiency of each of the stage amplifiers according to the magnitude of the power of each of the stage amplifiers;

wherein the bias control circuit comprises a comparator, thereby outputting a bypass control signal when the power controller is disabled.

2. The apparatus according to claim 1, further comprising a signal bypass unit, thereby grounding the emission signal for preventing the emission signal from being transmitted to each of the stage amplifiers when the bypass control signal is enabled.

3. An apparatus of power controlling in a transmitter for receiving an emission signal and outputting to an antenna, comprising:

a plurality of stage amplifiers for receiving the emission signal and amplifying the power thereof;

a plurality of matching circuits connected between the stage amplifiers for matching with the stage amplifiers, respectively;

a plurality of power detectors for detecting the power of the amplifiers and generating detection signals; and

a bias control circuit for receiving the detection signals of the power detectors, thereby generating a bias of each of the stage amplifiers in order to optimize the efficiency of each of the stage amplifiers according to the magnitude of the power of each of the stage amplifiers;

wherein the bias control circuit comprises a comparator, thereby outputting a bypass control signal when the power controller is disabled.

4. The apparatus according to claim 3, further comprising a signal bypass unit, thereby grounding the emission signal for preventing the emission signal from being transmitted to each of the stage amplifiers when the bypass control signal is enabled.