Set/reset circuit and magnetic sensing device using the same
AssigneeVoltafield Technology Corporation
InventorNai-Chung FU
Life of this patent
Estimating the term…
Abstract
A set/reset circuit used with a magnetoresistive sensor includes a coil, four switch units, a capacitor and a control unit. The four switch units are electrically coupled between a power supply voltage (or a reference voltage) and the coil and have variable resistances. The first end of the capacitor is electrically coupled to the power supply voltage and some of the switch units, and the second end of the capacitor is electrically coupled to the reference voltage. The control unit is electrically coupled to the four switch units and configured to receive a first pulse width modulation signal and a second pulse width modulation signal. A magnetic sensing device utilizing the abovementioned set/reset circuit is also provided.
Claims18
A set/reset circuit used with a magnetoresistive sensor, the set/reset circuit comprising:
- a coil, having a first end and a second end;
- a first switch unit, electrically coupled between a power supply voltage and the first end of the coil and having a variable resistance;
- a second switch unit, electrically coupled between the power supply voltage and the second end of the coil and having a variable resistance;
- a third switch unit, electrically coupled between the second end of the coil and a reference voltage and having a variable resistance;
- a fourth switch unit, electrically coupled between the first end of the coil and the reference voltage and having a variable resistance;
- a capacitor, having a first end and a second end, wherein the first end of the capacitor is electrically coupled to the power supply voltage, the first switch unit and the second switch unit, and the second end of the capacitor is electrically coupled to the reference voltage;
- and
- a control unit, electrically coupled to the first, the second, the third and the fourth switch units and configured to receive a first pulse width modulation signal and a second pulse width modulation signal.
A magnetic sensing device, comprising:
- a magnetoresistive sensor;
- and
- a set/reset circuit, comprising:
- a coil, having a first end and a second end;
- a first switch unit, electrically coupled between a power supply voltage and the first end of the coil and having a variable resistance;
- a second switch unit, electrically coupled between the power supply voltage and the second end of the coil and having a variable resistance;
- a third switch unit, electrically coupled between the second end of the coil and a reference voltage and having a variable resistance;
- a fourth switch unit, electrically coupled between the first end of the coil and the reference voltage and having a variable resistance;
- a capacitor, having a first end and a second end, wherein the first end of the capacitor is electrically coupled to the power supply voltage, the first switch unit and the second switch unit, and the second end of the capacitor is electrically coupled to the reference voltage;
- and
- a control unit, electrically coupled to the first, the second, the third and the fourth switch units and configured to receive a first pulse width modulation signal and a second pulse width modulation signal.
Dependencies are inferred from the claim text.