Electronic devices having quadratic phase generation circuitry

US11863225B2 · kind B2 · utility

Assignee

• Apple Inc. · US

Inventors

• Andreas Menkhoff · Oberhaching, DE
• Andreas Boehme · Nuremberg, DE
• Bernhard Sogl · Unterhaching, DE
• Jochen Schrattenecker · Eisenlohrsweg, AT
• Joonhoi Hur · Dallas, US

Key dates

• Filing date: Sep 7, 2021
• Grant date: Jan 2, 2024
• Expiry date: Oct 16, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B2001/6912
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An electronic device may include wireless circuitry. The wireless circuitry may include a quadratic phase generator for outputting a perfectly interpolated constant amplitude zero autocorrelation (CAZAC) sequence for a transmit path. The quadratic phase generator may include a numerically controlled oscillator, a switch controlled based on a value output from the numerically controlled oscillator, a first integrator stage, and a second integrator stage connected in series with the first integrator stage. The numerically controlled oscillator may receive as inputs a chirp count and a word length. The switch may be configured to switchably feed one of two input values that are a function of the chirp count and the word length to the first integrator stage. The quadratic phase generator may output full-bandwidth chirps or reduced-bandwidth chirps. Bandwidth reduction can be achieved by scaling the two input values of the switches.