Frequency synthesizer system with reference oscillator tuning
The frequency synthesizer system addresses the challenge of generating high spectral purity LO signals by tuning the reference oscillator to avoid near-integer division ratios, reducing complexity and spurs, and improving performance in multi-antenna transceivers.
WO2026130736A1PCT designated stage Publication Date: 2026-06-25TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
- Filing Date
- 2024-12-20
- Publication Date
- 2026-06-25
Smart Images
Figure EP2024088149_25062026_PF_FP_ABST
Abstract
A frequency synthesizer system (200) and method therein for operating the frequency synthesizer system (200). The frequency synthesizer system (200) comprises a phase locked loop, PLL (210) comprising a phase detector (211), a loop filter (212), a digitally controlled oscillator, DCO (213) and a frequency divider (214). The frequency synthesizer system (200) comprises further comprises a reference oscillator (220) and a control circuitry (230). The control circuitry (230) is configured to apply a tuning signal to the reference oscillator (220), based on a frequency tuning characteristic of the reference oscillator (220) obtained through measurements using the PLL (210), to tune an oscillating frequency of the reference oscillator (220) enabling the frequency divider (214) to operate with an integer division ratio or a fractional division ratio having the fractional part outside exclusion zones (R31, R32), and the PLL (210) tuning the DCO (213) towards a target operating frequency. The exclusion zones (R31, R32) are determined based on a tuning range of the reference oscillator (220).
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