| 摘要 |
A programming method (250) for digitally programming the adjustment of an electronic trim capacitor (212, 314, 414). In an initial step (252), programming is initiated by setting an enable terminal (224). In subsequent steps (254, 256) a pulse signal (226) then applied to a program terminal (222) and the number of pulses (228) provided to the programming terminal (222) while the enable terminal (224) is set determines the total number of capacitance increments for which the electronic trim capacitor (212, 314, 414) is programmed. The electronic trim capacitor (212, 314, 414) may be incorporated into an integrated circuit (12, 312) or a module (412) and the electronic trim capacitor (212, 314, 414) may be programmed and used "in situ" in a more general circuit (1) such as an oscillator (301) or an amplifier (401).
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