| 摘要 |
The invention provides a unique apparatus and method which varies the capacitance coupled to a circuit. In one embodiment, the variable capacitance comprises a unique variable capacitance array (402) with multiple capacitance modules (508, 540 and 550) which can be selectively enabled. Each capacitance module has a capacitive value (510, 542, 544, 552 and 556) and a corresponding parasitic capacitance. The invention provides high linearity, low spread, improves the response to power fluctuations by maintaining a consistent relationship between the capacitive value (510, 542, 544, 552 and 556) and the parasitic capacitance in each capacitance module (508, 540 and 550). For example, the invention can be used with devices to provide a linear variation of capacitance. In addition, the invention can be used to calibrate a wide range of devices.
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