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    • 1. 发明授权
    • Communications receiver with integrated IF filter and method therefor
    • 具有集成IF滤波器的通信接收器及其方法
    • US06885853B2
    • 2005-04-26
    • US09833438
    • 2001-04-11
    • Kazim SevensMajid M. HashemiIsmail H. Ozguc
    • Kazim SevensMajid M. HashemiIsmail H. Ozguc
    • H03J3/08H04B1/06
    • H03J3/08
    • A receiver (22) includes an IF filter (44) and a nearby process-variant circuit (80) formed on a common semiconductor substrate (24). The actual center frequency of the IF filter (44) is determined by resistors (70, 74) and capacitors (72, 76) exhibiting imprecise values and is unlikely to equal a nominal center frequency. The process-variant circuit (80) includes a test resistor (102) and test capacitor (104) formed using the same resistor-forming and capacitor-forming processes used to form the IF filter resistors (70, 74) and capacitors (72, 76). In response a test signal (88) from the process-variant circuit (80) and a reference signal (84) from a process-invariant circuit (82), a tuning parameter for a tunable local oscillator (90) is determined so that a local oscillation signal (94) will exhibit a frequency which, when mixed with an RF signal (38) yields an IF signal (42) at the actual center frequency of the IF filter (44).
    • 接收器(22)包括形成在公共半导体衬底(24)上的IF滤波器(44)和附近的过程变量电路(80)。 中频滤波器(44)的实际中心频率由电阻(70,74)和显示不精确值的电容器(72,76)确定,并且不太可能等于标称中心频率。 过程变量电路(80)包括使用与形成IF滤波电阻(70,74)和电容器(72,74)相同的电阻器形成和电容器形成工艺形成的测试电阻器(102)和测试电容器(104) 76)。 响应于来自过程变量电路(80)的测试信号(88)和来自过程不变电路(82)的参考信号(84),确定可调谐本地振荡器(90)的调谐参数,使得 本地振荡信号(94)将呈现频率,当与RF信号(38)混合时,IF滤波器(44)的实际中心频率产生IF信号(42)。