Patent ID: 6215365
Filing Date: 2001-04-10
Classification: H03K,H03L

Abstract:
An inductive proximity sensor oscillator comprising:a reference voltage source including, a first resistance, a second resistance, a first capacitance, and a voltage source, the first resistance connected to a positive side of the voltage source, and to a first connection point, the first connection point also having connected thereto the second resistance and the first capacitance, the second resistance and the first capacitance further connected to ground, whereby the second resistance and the first capacitance are connected in parallel;a comparator including an inverting input, a non-inverting input and an output;a resonant tank circuit including a resonant inductance and a resonant capacitance connected in parallel, one end of the resonant tank connected to the first connection point;a current limiting resistance connected to the output of the comparator, and to the resonant tank and the non-inverting input of the comparator; anda start-up circuit including, a start-up capacitance and a start-up resistance, the start-up resistance connected the output of the comparator, and to a second connection point, to which is also connected the inverting input of the comparator and the start-up capacitance, the start-up capacitance further connected to the ground.