Edge power detector/controller
First Claim
1. A power detector/controller for wireless handsets that use a modulation scheme having a non-constant amplitude envelope, the power detector/controller comprising:
- a power amplifier having an input to receive a input signal with non-constant amplitude envelope and an output to output an amplified input signal, wherein either output power or gain of the power amplifier is controlled by a power amplifier control signal;
an output demodulating detector coupled to the output of the power amplifier to generate a feedback signal proportional to the amplified input signal'"'"'s power, the feedback signal including an AM variation due to the non-constant amplitude envelope;
a summing junction to receive the feedback signal, a ramp control signal that indicates either a target gain or target output power of the power amplifier, and an AM variation signal that represents the AM variation in the power of the input signal due to the non-constant amplitude envelope; and
the summing junction combining the feedback signal, the ramp control signal and AM variation signal to produce the power amplifier control signal such that the power amplifier control signal substantially free of any AM variation due to the non-constant envelope.
1 Assignment
0 Petitions
Accused Products
Abstract
Described is a closed-loop power detector/controller for wireless systems employing a non-constant amplitude envelope modulation scheme. Any AM component in the feedback signal resulting from non-constant amplitude envelope signals is eliminated via feed-forward cancellation of the envelope signal. Generally, a signal representative of the AM variation in the non-constant amplitude envelope signals prior to amplification is obtained. This AM variation signal is then used to cancel any AM component in the feedback signal resulting from the non-constant envelope to create a power amplifier control signal without any AM variation, only the desired ramp profile.
-
Citations
32 Claims
-
1. A power detector/controller for wireless handsets that use a modulation scheme having a non-constant amplitude envelope, the power detector/controller comprising:
-
a power amplifier having an input to receive a input signal with non-constant amplitude envelope and an output to output an amplified input signal, wherein either output power or gain of the power amplifier is controlled by a power amplifier control signal;
an output demodulating detector coupled to the output of the power amplifier to generate a feedback signal proportional to the amplified input signal'"'"'s power, the feedback signal including an AM variation due to the non-constant amplitude envelope;
a summing junction to receive the feedback signal, a ramp control signal that indicates either a target gain or target output power of the power amplifier, and an AM variation signal that represents the AM variation in the power of the input signal due to the non-constant amplitude envelope; and
the summing junction combining the feedback signal, the ramp control signal and AM variation signal to produce the power amplifier control signal such that the power amplifier control signal substantially free of any AM variation due to the non-constant envelope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A wireless handset for a mobile communication system that uses a modulation scheme having a non-constant amplitude envelope, the wireless handset comprising:
-
a power detector/controller to control the power level of output RF bursts, the power detector/controller comprising;
a power amplifier having an input to receive a input signal with non-constant amplitude envelope and an output to output an amplified input signal, wherein either output power or gain of the power amplifier is controlled by a power amplifier control signal;
an output demodulating detector coupled to the output of the power amplifier to generate a feedback signal proportional to the amplified input signal'"'"'s power, the feedback signal including an AM variation due to the non-constant amplitude envelope;
a summing junction to receive the feedback signal, a ramp control signal that indicates either a target gain or target output power of the power amplifier, and an AM variation signal that represents the AM variation in the power of the input signal due to the non-constant amplitude envelope; and
the summing junction combining the feedback signal, the ramp control signal and AM variation signal to produce the power amplifier control signal such that the power amplifier control signal substantially free of any AM variation due to the non-constant envelope. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 29, 31)
-
-
23. An RF power amplifier module for signals having a modulation scheme with a non-constant amplitude envelope, the RF power amplifier module comprising:
-
a power amplifier having an input to receive a input signal with non-constant amplitude envelope and an output to output an amplified input signal, wherein either output power or gain of the power amplifier is controlled by a power amplifier control signal;
an output demodulating detector coupled to the output of the power amplifier to generate a feedback signal proportional to the amplified input signal'"'"'s power, the feedback signal including an AM variation due to the non-constant amplitude envelope;
a summing junction to receive the feedback signal, a ramp control signal that indicates either a target gain or target output power of the power amplifier, and an AM variation signal that represents the AM variation in the power of the input signal due to the non-constant amplitude envelope; and
the summing junction combining the feedback signal, the ramp control signal and AM variation signal to produce the power amplifier control signal such that the power amplifier control signal substantially free of any AM variation due to the non-constant envelope. - View Dependent Claims (24, 25, 26, 27, 28, 30, 32)
-
Specification