公开(公告)号：WO0131774A9

公开(公告)日：2002-08-08

申请号：PCT/US0029437

申请日：2000-10-26

Applicant: ANALOG DEVICES INC

Inventor： RANDERS ESBEN ,  BRETT STEPHEN J

IPC: H03B1/00 ,  H03B5/32 ,  H03J7/04 ,  H03J7/08

CPC classification number: H03B5/32 ,  H03B2201/0208 ,  H03B2201/025 ,  H03J7/04 ,  H03J7/08 ,  H03J2200/10

Abstract: A programmable capacitor array is used to trim the frequency of a crystal oscillator for initial offset. An apparatus includes the crystal oscillator and an integrated circuit (36) is coupled to the crystal (30) of the oscillator. The programmable capacitor array (32) is formed on the integrated circuit and is coupled to the crystal (30) and is responsive to a signal for setting the capacitance of the capacitor array to one of a number of capacitance values. A discrete controllable capacitance device (V03) not one the integrated circuit is coupled to the crystal (30) and is responsive to a control signal (AFC) to change its capacitance. The crystal oscillator frequency is dependent on the capacitances of both the programmable capacitor array (32) and the discrete capacitor (V03).

Abstract translation: 可编程电容阵列用于调整晶体振荡器的初始偏移频率。 一种装置包括晶体振荡器，并且集成电路（36）耦合到振荡器的晶体（30）。 可编程电容器阵列（32）形成在集成电路上并耦合到晶体（30），并且响应于用于将电容器阵列的电容设置为多个电容值中的一个的信号。 分立可控电容器件（V03）不是集成电路中的一个耦合到晶体（30），并响应于控制信号（AFC）来改变其电容。 晶体振荡器频率取决于可编程电容阵列（32）和分立电容（V03）的电容。