Abstract:
PURPOSE: A low phase noise VCO using output matching network based on harmonic control circuit is provided to deliver a main signal without loss after removing the second and third harmonics. CONSTITUTION: A harmonic control circuit is comprised of a double parallel stub to remove harmonics. The phenomenon of short circuit impedance point about the second and third harmonics is compensated. The additional microstrip line is included to prevent the thing overlapped on a layout by a stub. The harmonic control circuit is removed by becoming short circuit impedance about the second and third harmonics.
Abstract:
A crystal oscillator is provided to safely mount a crystal piece by forming a cavity of the ceramic package widely. A crystal oscillator includes a ceramic package, an electrode pad(21), a frequency oscillating piezoelectric element(5), a conductive adhesive, a bump(7), and a lid(4). The ceramic package has a plurality of ceramic layers(1,2) to form cavities(20,30). The electrode pad(21) is formed on an upper surface of one of the plurality of ceramic layers(1,2). One end of the frequency oscillating piezoelectric element(5) is fixed on the electrode pad(21). The conductive adhesive is coated on an upper surface of the electrode pad(21) to adhere one end of the piezoelectric element(5). The bump(7) is formed inside the ceramic package. The lid(4) covers an upper part of the ceramic package to seal the ceramic package. The bump(7) is made of tungsten or nickel, and the other end of the piezoelectric element(5) is placed on an upper surface of the bump(7).
Abstract in simplified Chinese:一种用以将关联于一电子共振器系统之品质因子Q最优化的设备,其中包含一LC共振器以及一提供一负电阻的最优化电路。该最优化电路系电子耦接于该共振器电路,且包含两个CMOS晶体管组对,该CMOS晶体管组对由pmos&nmos组成,各PMOS晶体管之闸极是透过电容器而与该输入端交跨耦接至该共振器,以及该NMOS晶体管透过电容器而与该输入端交跨耦接至该共振器。该最优化电路可接收至少一个控制电压,以借由选择性地偏压该PMOS晶体管及NMOS晶体管来改变该负电阻。该最优化电路也包含一电流源,将一受控制电流提供给该CMOS晶体管组对。该电流源位于一供应电压与该CMOS晶体管组对之间,或者是位在该CMOS晶体管组对与一接地参考电压之间。一电流控制电压可控制流经该CMOS晶体管组对的电流。