(19)
(11)EP 3 509 215 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
14.08.2019 Bulletin 2019/33

(43)Date of publication A2:
10.07.2019 Bulletin 2019/28

(21)Application number: 18202444.8

(22)Date of filing:  24.10.2018
(51)Int. Cl.: 
H03K 5/135  (2006.01)
H04B 7/26  (2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 04.01.2018 US 201862613441 P
10.04.2018 US 201862655325 P
04.10.2018 US 201816152391

(71)Applicant: MediaTek Inc.
Hsin-Chu, 300 (TW)

(72)Inventors:
  • HSU, Jui-Lin
    30078 Hsinchu (TW)
  • HUNG, Chao-Ching
    30078 Hsinchu (TW)
  • LIN, Tzu-Chin
    30078 Hsinchu (TW)
  • HSU, Wei-Hsiu
    30078 Hsinchu (TW)
  • HSUEH, Yu-Li
    30078 Hsinchu (TW)
  • ZHAN, Jing-Hong Conan
    30078 Hsinchu (TW)
  • HUNG, Chih-Ming
    San Jose, California 95134 (US)

(74)Representative: Haseltine Lake Kempner LLP 
Lincoln House, 5th Floor 300 High Holborn
London WC1V 7JH
London WC1V 7JH (GB)

  


(54)WIRELESS SYSTEM HAVING LOCAL OSCILLATOR SIGNAL DERIVED FROM REFERENCE CLOCK OUTPUT OF ACTIVE OSCILLATOR THAT HAS NO ELECTROMECHANICAL RESONATOR


(57) A wireless system includes an active oscillator and a front-end circuit. The active oscillator is used to generate and output a reference clock. The active oscillator includes at least one active component, and does not include an electromechanical resonator. The front-end circuit is used to process a transmit (TX) signal or a receive (RX) signal according to a local oscillator (LO) signal. The LO signal is derived from the reference clock.