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    • 9. 发明申请
    • Tracking filter for tuner
    • 调谐器跟踪滤波器
    • US20060154636A1
    • 2006-07-13
    • US11302876
    • 2005-12-14
    • Peter ShahYongSik YounMartin Alderton
    • Peter ShahYongSik YounMartin Alderton
    • H04B1/18
    • H03H7/0153H03J5/244H03J2200/10H03J2200/32
    • A tuner uses a bank of tracking filters to preselect a channel to be received. Each tracking filter covers a range of frequencies. The tracking filters are tunable in frequency using switched capacitors and are tunable in gain by using switched resistors. The switched resistors can be controlled by an automatic gain control circuit that monitors the selected signal and adjust the tracking filter gain to achieve a desired signal level. A switch directs the received signal or signal from a test tone generator into the tracking filters. The test tone, generated by a frequency agile circuit, can be used to calibrate the filters, both in frequency and gain.
    • 调谐器使用一组跟踪滤波器来预选要接收的频道。 每个跟踪滤波器覆盖一定范围的频率。 跟踪滤波器在频率上是可调谐的,使用开关电容器,并且通过使用开关电阻可调谐增益。 开关电阻可以由自动增益控制电路控制,该电路监视所选择的信号并调整跟踪滤波器增益以实现期望的信号电平。 开关将来自测试音发生器的接收信号或信号引导到跟踪滤波器中。 由频率敏捷电路产生的测试音可用于校准频率和增益的滤波器。
    • 10. 发明授权
    • Method and apparatus for calibrating modulation sensitivity
    • 用于校准调制灵敏度的方法和装置
    • US06034573A
    • 2000-03-07
    • US961400
    • 1997-10-30
    • Martin Alderton
    • Martin Alderton
    • H03D7/16H03C3/08
    • H03D7/161
    • A method and apparatus for continuously calibrating the modulation sensitivity of a voltage controlled oscillator (VCO) within a modulator of a transmitter. In accordance with the present invention, the transmitter is coupled to the receiver in order to loop back the transmit signal. The present invention includes a baseband signal generator which generates a reference baseband signal of known amplitude during periods when no other baseband information is being applied to the transmitter by the user. A Signal and Reference Comparison Circuit (SRCC) receives the output from the demodulator and determines whether the VCO within the transmitter has the proper modulation sensitivity. If the modulation sensitivity of the VCO is not within a desired range, then a signal generated by the SRCC is applied to a baseband level control circuit to adjust the level of the baseband signal that is applied to the VCO.
    • 一种用于连续校准发射机调制器内的压控振荡器(VCO)的调制灵敏度的方法和装置。 根据本发明,发射机耦合到接收机以便回传发射信号。 本发明包括基带信号发生器,其在没有其他基带信息被用户向发射机应用的时段期间产生已知幅度的参考基带信号。 信号和参考比较电路(SRCC)接收解调器的输出,并确定发射机内的VCO是否具有适当的调制灵敏度。 如果VCO的调制灵敏度不在期望的范围内,则由SRCC产生的信号被施加到基带电平控制电路以调整施加到VCO的基带信号的电平。