Charge balancing detection circuit

Details Charge balancing detection circuit Charge balancing detection circuit

G - Physics

01

R

324/44

G01R 27/26 (2006.01) G01P 15/08 (2006.01) G01P 15/125 (2006.01) G01R 15/09 (2006.01)

Patent

CA 1248587

CHARGE BALANCING DETECTION CIRCUIT Abstract Prior detection circuits for measuring capacitance differences have commonly included error sources, such as P-N junctions, in the DC signal path. The present invention provides an improved detection circuit for measur- ing the capacitance difference between first (C1) and second (C2) capacitive elements. The detection circuit comprises Q first capacitor (C3) serially connected to the first capacitive element at a first common node (36) to form a first series circuit, and a second capacitor (C4) serially connected to the second capacitive element at a second common node (38) to form a second series circuit. The detection circuit also includes switch means (32) connected betweenthe common nodes and a reference potential, drive means (30) for applying a drive signal across each series circuit, switch activation means (48) and means (34) for measuring the voltage difference between the common nodes. The switch means has a first state in which the common nodes are connected to the reference potential and a second state in which the common nodes are isolated from the reference potential and from one another. The drive signal comprises a series of first voltage transitions (104, 106) operative to vary the total voltage drop across each series circuit. The switch activation means changes the switch means from the first state to the second state at or prior to each first voltagetransition. Therefore after each first voltage transition, the difference between the voltages of the first and second common nodes is a measure of the differencebetween the capacitances of the first and second capacitive elements. A similar technique may be applied to the measurement of the capacitance of a single capacitor.

498096

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