Texas Instruments Corporation

Sai Vaibhav Batchu

Sarma Sundareswara Gunturi

Chandrasekhar Sriram

Aswath Vs

Raju Kharataram Chaudhari

Venkateshwara Reddy Pothapu

Divyeshkumar Mahendrabhai Patel

Divyansh Deepak Jain

Pankaj Gaur

Examples of this description provide for a method. In some examples, the method includes determining, via a circuit, an estimated value of harmonic coupling in a transmitted signal via a feedback signal path that receives the transmitted signal and performing pre-compensation for the harmonic coupling based on the estimated value, the pre-compensation performed in the circuit.

Estimation and pre-compensation of harmonic coupling spurs

A TX-TX pre-compensation system that estimates unwanted coupling in a victim transmit chain caused by an aggressor transmit chain and injects a pre-compensation signal to cancel out the estimated coupling. In some embodiments, a signal measurement module estimates the amplitude, phase, and envelope delay of the coupling and an isolation pre-compensation module generates the pre-compensation signal based on the estimated amplitude, the estimated phase, the estimated envelope delay, and the difference between the carrier frequencies of the transmit chains. Since the phase of the coupling may be affected by the carrier frequency of the transmit chains, in some embodiments the phase of the pre-compensation signal is adjusted in response to a change in carrier frequency. Since the amplitude of the coupling may be affected by attenuator gain settings, in some embodiments the amplitude of the pre-compensation signal may be adjusted in response to a change in attenuator gain setting.

Enhancing TX-TX isolation through digital pre-compensation

Growing community of inventors

Tadepalligudem, India

Sai Vaibhav Batchu