Transmitter phase shift determination and compensation

US8055212B2 · kind B2 · utility

Assignee

• ST-ERICSSON SA · CH

Inventors

• Jonas Persson · Lund, SE
• Ralf Burdenski · Nuremberg, DE
• Ralf Dittrich · Düsseldorf, DE

Key dates

• Filing date: May 26, 2009
• Grant date: Nov 8, 2011
• Expiry date: Jul 2, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03F3/24
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A wireless communication transmitter is configured to determine transmitter phase shift, and correspondingly includes a derivation circuit, one or more slope polarity tracking circuits, and a phase shift computation circuit. The derivation circuit derives a reference signal from a signal input to the transmitter and a feedback signal from the transmit signal corresponding to that input signal. So derived, differences in the reference and feedback signals reveal the effect the transmitter has on the transmit signal. Accordingly, the transmitter focuses on differences in the polarities of the reference signal's slope and the feedback signal's slope to determine the effect the transmitter has on the phase of the transmit signal. That is, the slope polarity tracking circuits track the slope polarities of the reference and feedback signals, while the phase shift computation circuit computes the transmitter phase shift as a function of differences in those tracked slope polarities.