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Variable capacitance switched capacitor input system and method

A switched capacitor and variable capacitance technology, which is applied in the system field of the sigma delta modulator system, can solve the problems of variable capacitance influence, error, etc.

Inactive Publication Date: 2007-07-25
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] A disadvantage of these devices is that in practical applications the unknown variable capacitance often suffers from leakage currents which introduce errors when determining the capacitance

Method used

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  • Variable capacitance switched capacitor input system and method
  • Variable capacitance switched capacitor input system and method
  • Variable capacitance switched capacitor input system and method

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Embodiment Construction

[0034] In addition to the one or more preferred embodiments described below, the invention is capable of other embodiments and of being practiced or carried out in various ways. Thus, it should be understood that the application of the present invention is not limited to the specific structures and arrangements of elements set forth in the following description or illustrated in the drawings.

[0035] As shown in FIG. 1 , the prior art circuit includes a sigma delta modulator 10 including a comparator 12 , one or more integrators 14 , 16 , and a switched capacitor system 18 . Each integrator 14, 16, etc. has its own switched capacitor system associated therewith, although only the switched capacitor system 18 associated with integrator 14 is shown for simplicity. Integrator 14 includes amplifier 20 and feedback capacitor 22 . The switched capacitor system 18 includes a reference capacitor 24 and an input capacitor 26 . There is a power supply 28 for an input voltage Vin+ and...

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Abstract

A variable capacitance switched capacitor input system and method includes a differential integrator circuit having first and second input summing nodes and a variable sensing capacitor; one terminal of the variable sensing capacitor is connected to one of the nodes in the first phase and to the other of the nodes in the second phase; an input terminal connected to a second terminal of the variable sensing capacitor receives a first voltage level in the first phase and a second voltage level in the second phase for delivering the charge on the variable sensing capacitor to the first summing node in the first phase and to the second summing node in the second phase and canceling errors in a differential integrator circuit output caused by leakage current.

Description

technical field [0001] The present invention relates to an improved variable capacitance switched capacitor input system and method, and more particularly, to a system and method that is insensitive to leakage current, and more particularly, to a system for a sigma delta modulator system. Background technique [0002] Conventional switched capacitor input systems, such as those used in integrator circuits in sigma delta modulators, employ a reference voltage, a reference capacitor, and an input capacitor to determine an unknown input voltage. The switching system applies a reference voltage during a first phase to charge a reference capacitor and an input voltage to charge an input capacitor, and then transfers these charges to a summing node of an integrator circuit during a second phase. At the end of the second phase, the integrator output reflects the sum of the input charge and the reference charge. The integrator circuit output resulting from the operation is passed t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12H03M3/02
CPCH03M3/43H03M3/34
Inventor 约翰·欧多德达米恩·麦卡锡
Owner ANALOG DEVICES INC