FDAC/2 spur estimation and correction

US11777513B2 · kind B2 · utility

Assignee

• TEXAS INSTRUMENTS INCORPORATED · US

Inventors

• Karthikeyan Gunasekaran · Viralimalai, IN
• Snehasish Roychowdhury · Gurugram, IN
• Rakesh Manjunath · Bengaluru, IN
• Aswath V S · Kannur, IN
• Sthanunathan Ramakrishnan · Bengaluru, IN
• Sarma Sudareswara Gunturi · Bengaluru, IN
• Rahul Sharma · Savanuru, IN
• Jagannathan Venkataraman · Bengaluru, IN
• Nagarajan Viswanathan · Bengaluru, IN

Key dates

• Filing date: Nov 30, 2021
• Grant date: Oct 3, 2023
• Expiry date: Nov 30, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M1/662
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A spur correction system for a transmit chain having an interleaving multiplexer. In some embodiments, the spur correction system includes a spur sense chain, a correction controller, and a Q path corrector. The interleaving multiplexer combines signals from multiple bands in response to a clock signal. The spur sense chain estimates an error that is in phase with the clock signal (an I-phase error) and an error that is a derivative of the clock signal (a Q-phase error). The correction controller compensates for the estimated I-phase error by injecting an I-phase correction signal into the transmit chain. The Q path corrector compensates for the estimated Q-phase error by selectively connecting one or more capacitors within the interleaving multiplexer.