公开(公告)号：US20030035071A1

公开(公告)日：2003-02-20

申请号：US10217978

申请日：2002-08-13

Applicant: PACE MICRO TECHNOLOGY PLC.

Inventor： Stephen Beales ,  Darren Butler

IPC: H04N005/44

CPC classification number: H03L1/02

Abstract: The invention relates to a method of controlling the operation of a voltage controlled oscillator (VCO) with respect to a SAW filter (6) within a broadcast data receiver (BDR) (104). Over time, it is found that during normal operation of the BDR (104), the SAW filter (6) is susceptible to frequency drift which can affect the operation of the BDR. In accordance with the invention, temperature readings are taken at various time intervals from within the BDR (104) to provide an indication of changes in temperature over time and, if the temperature does change in the BDR with time then the operating frequency of the VCO can be adjusted to a predefined frequency value which is appropriate for the temperature values measured. By adjusting the operating frequency of the VCO with changes in temperature, the drift of the SAW filter (6) can be compensated for, thereby ensuring the continued operation of the BDR (104) in the required manner.

Abstract translation: 本发明涉及一种控制广播数据接收机（BDR）（104）内的SAW滤波器（6）的压控振荡器（VCO）的操作的方法。 随着时间的推移，发现在BDR（104）的正常操作期间，SAW滤波器（6）易受频率漂移的影响，这可能影响BDR的操作。 根据本发明，从BDR（104）内的各种时间间隔获取温度读数，以提供温度随时间变化的指示，并且如果温度随时间而在BDR中变化，则VCO的工作频率 可以调整到适合于测量的温度值的预定频率值。 通过随温度变化调节VCO的工作频率，可以补偿SAW滤波器（6）的漂移，从而确保BDR（104）以所需方式继续运行。