Method and system for compensating for estimated distortion in a transmitter by utilizing a digital predistortion scheme with a quadrature feedback mixer configuration
First Claim
1. A method for estimating distortion in a transmitter circuit in a wireless communications system, the method comprising:
- in a single chip comprising a radio frequency (RF) transmitter and an RF receiver, generating an RF output signal at an output of one or more power amplifiers in said RF transmitter in response to a generated one or more input signals;
generating one or more feedback signals by performing a frequency downconversion operation on said generated RF output signal within a corresponding one or more feedback mixer circuits in said single chip; and
selectively inserting said generated one or more feedback signals at a corresponding one or more insertion points in said RF receiver utilizing one or more switches according to one of a normal operating mode and a calibration mode, wherein each of said corresponding one or more insertion points is between a corresponding mixer circuit in said RF receiver and a corresponding one or more circuits within said single chip that generate a baseband signal based on a corresponding one of said generated one or more feedback signals, and wherein said corresponding mixer circuit in said RF receiver is separate from said one or more feedback mixer circuits, and wherein selectively inserting according to said calibration mode comprises configuring a closed feedback loop comprising said RF transmitter and a portion of said RF receiver defined by said one or more insertion points.
7 Assignments
0 Petitions
Accused Products
Abstract
Aspects of a method and system for compensating for estimated distortion in a transmitter by utilizing a digital predistortion scheme with a quadrature feedback mixer configuration are presented. Aspects of the system may include an RF transmitter that enables generation of an RF output signal in response to one or more generated input signals. One or more feedback signals may be generated by performing frequency downconversion on the RF output signal within a corresponding one or more feedback mixer circuits. The generated one or more feedback signals may be inserted at a corresponding one or more insertion points in an RF receiver. Each insertion point may be between a receiver mixer circuit and corresponding circuits that generate a baseband signal based on the corresponding one of the feedback signals.
7 Citations
29 Claims
-
1. A method for estimating distortion in a transmitter circuit in a wireless communications system, the method comprising:
-
in a single chip comprising a radio frequency (RF) transmitter and an RF receiver, generating an RF output signal at an output of one or more power amplifiers in said RF transmitter in response to a generated one or more input signals; generating one or more feedback signals by performing a frequency downconversion operation on said generated RF output signal within a corresponding one or more feedback mixer circuits in said single chip; and selectively inserting said generated one or more feedback signals at a corresponding one or more insertion points in said RF receiver utilizing one or more switches according to one of a normal operating mode and a calibration mode, wherein each of said corresponding one or more insertion points is between a corresponding mixer circuit in said RF receiver and a corresponding one or more circuits within said single chip that generate a baseband signal based on a corresponding one of said generated one or more feedback signals, and wherein said corresponding mixer circuit in said RF receiver is separate from said one or more feedback mixer circuits, and wherein selectively inserting according to said calibration mode comprises configuring a closed feedback loop comprising said RF transmitter and a portion of said RF receiver defined by said one or more insertion points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 26, 28)
-
-
12. A system for estimating distortion in a transmitter circuit in a wireless communications system, the system comprising:
-
one or more circuits in a single chip comprising a radio frequency (RF) transmitter and a RF receiver, said one or more circuits are operable to generate an RF output signal at an output of one or more power amplifiers in said RF transmitter in response to a generated one or more input signals; said one or more circuits are operable to generate one or more feedback signals by performing a frequency downconversion operation on said generated RF output signal within a corresponding one or more feedback mixer circuits in said single chip; and said one or more circuits are operable to selectively insert said generated one or more feedback signals at a corresponding one or more insertion points in said RF receiver utilizing one or more switches according to one of a normal operating mode and a calibration mode, wherein each of said corresponding one or more insertion points is between a corresponding mixer circuit in said RF receiver and a corresponding one or more circuits within said single chip that generate a baseband signal based on a corresponding one of said generated one or more feedback signals, and wherein said corresponding mixer circuit in said RF receiver is separate from said one or more feedback mixer circuits. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 27, 29)
-
-
23. A system for estimating distortion in a transmitter circuit in a wireless communications system, the system comprising:
-
one or more circuits in a single chip comprising a radio frequency (RF) transmitter, an RF receiver, and one or more power amplifiers, said one or more circuits enable generation of an RF output signal at an output of said one or more power amplifiers in said RF transmitter in response to a generated one or more input signals; said one or more circuits enable generation of a plurality of feedback signals by performing a frequency downconversion operation on said generated RF output signal within a corresponding plurality of feedback mixer circuits in said single chip; and
said one or more circuits enable selective insertion of said generated plurality of feedback signals as an input to said RF receiver utilizing one or more switches according to one of a normal operating mode and a calibretion mode.
-
-
24. A method for estimating distortion in a transmitter circuit in a wireless communications system, the method comprising:
-
in a single chip comprising a radio frequency (RF) transmitter and an RF receiver, generating an RF output signal at the output of one or more power amplifiers in said RF transmitter in response to a generated one or more input signals; generating one or more feedback signals by performing a frequency downconversion operation on said generated RF output signal within a corresponding one or more feedback mixer circuits in said single chip; selectively inserting said generated one or more feedback signals at a corresponding one or more insertion points in said RF receiver utilizing one or more switches according to one of a normal operating mode and a calibration mode; and generating a baseband signal based on said generated one or more feedback signals.
-
-
25. A system for estimating distortion in a transmitter circuit in a wireless communications system, the system comprising:
-
one or more circuits in a single chip comprising a radio frequency (RF) transmitter and an RF receiver, said one or more circuits are operable to generate an RF output signal at the output of one or more power amplifiers in said RF transmitter in response to a generated one or more input signals; said one or more circuits are operable to generate one or more feedback signals by performing a frequency downconversion operation on said generated RF output signal within a corresponding one or more feedback mixer circuits in said single chip; said one or more circuits are operable to selectively insert said generated one or more feedback signals at a corresponding one or more insertion points in said RF receiver utilizing one or more switches according to one of a normal operating mode and a calibration mode; and said RF receiver is operable to generate a baseband signal based on said generated one or more feedback signals, and wherein during calibration mode, said one or more circuits for generating said baseband signal is further configured to compensate for at least one of AM-AM distortion and AM-PM distortion of said one or more power amplifiers.
-
Specification