Impedance measurement device
AssigneeFogale Nanotech
InventorChristian NEEL
Life of this patent
Estimating the term…
Abstract
An electronic impedance measurement device: a branch, called measurement branch, including an impedance to be measured (Zm), and; at least one branch, called reference branch, including an impedance (Zr), called reference impedance; electronics, called detection electronics, configured to provide an error signal (Vs) dependent on an algebraic sum of a current (Ir) flowing in the at least one reference branch (104) and of a current (Im) flowing in the measurement branch; and at least one adjustment structure, changing the current (Ir) in at least one of said reference branches in a manner inversely proportional to a control variable (k).
Claims20
An electronic impedance measurement device comprising:
- a branch, called measurement branch, comprising an impedance to be measured (Zm);
- and
- at least one branch, called reference branch, comprising an impedance (Zr), called reference impedance;
- electronics (called detection electronics, configured to provide an error signal (Vs) dependent on an algebraic sum of a current (Ir) flowing in the at least one reference branch and of a current (Im) flowing in the measurement branch;
- and
- at least one means, called adjustment means, changing the current (Ir) in the at least one reference branch in a manner inversely proportional to a control variable (k).
A method for measuring impedance, in particular capacitive impedance, with an electronic impedance measurement device comprising:
- a branch, called measurement branch, comprising an impedance to be measured (Zm);
- at least one branch, called reference branch, comprising an impedance (Zr), called reference impedance;
- a step of obtaining, with detection electronics, an error signal (Vs) dependent on an algebraic sum of a current (Ir) flowing in the at least one reference branch and of a current (Im) flowing in the measurement branch;
- and
- at least one iteration of a step, called adjustment step, changing the current (Ir) in said at least one reference branch in a manner inversely proportional to a control variable (k).
Dependencies are inferred from the claim text.