| 摘要 |
A circuit system for evaluating a sensor, wherein the circuit system comprises two complex impedances (2, 3, 13, 14), wherein the complex impedances (2, 3, 13, 14) are each part of a resonant circuit in which the complex impedances (2, 3, 13, 14) can be excited to perform oscillations, and wherein at least one of the two complex impedances (2, 3, 13, 14) are part of the sensor, is characterized with respect to a particularly cost-effective and as simple a circuit design as possible in that a counter (9, 18) and a switch apparatus (8, 16) are provided, wherein the counter (9, 18) can be used to alternately count the oscillations of one of the two resonant circuits, the switch apparatus (8, 16) can be switched when a specifiable counter reading has been reached, and the switch signal of the switch apparatus serves as a pulse width-modulated output signal (11, 21) for the circuit system. |
| 主权项 |
1. A circuit system for evaluating a sensor, said circuit system comprising:
two complex impedances, whereby the complex impedances are each part of an oscillating circuit in which the complex impedances are excited to oscillations and wherein at least one of the two complex impedances is a component of the sensor, wherein a counter and a switching apparatus are provided, whereby with the counter alternately the oscillations of one of the two oscillating circuits is counted, wherein when a predetermined counter status is reached, the switching apparatus is switched, wherein the switching signal of the switching apparatus serves as a pulse-width-modulated output signal of the circuit system, and wherein the oscillating circuits are designed as multivibrators, the time constants of which are each determined by a respective associated complex impedance and a respective resistor. |
