US 9,958,512 B2 · Low-power magnetic resistance switch sensor

Abstract

Disclosed in the present invention is a low-power magnetoresistive switch sensor, comprising an internal reference voltage circuit, a multiplexer, a magnetoresistive bridge circuit, a comparison circuit, a voltage stabilization circuit, a digital control circuit, and a digital output circuit; one end of the internal reference voltage circuit is grounded while the other end of the internal reference voltage circuit is connected to the output end of the voltage stabilization circuit; the comparison circuit comprises one or more comparators, one end of the comparison circuit is electrically connected with the voltage stabilization circuit while the other end is grounded, the comparison circuit is provided with one or more input ends and one or more output ends, and the one or more output ends of the comparison circuit are electrically connected with one input ends of the digital control circuit; one end of the magnetoresistive bridge circuit is electrically connected with the output end of the voltage stabilization circuit while the other end is grounded, and the output end of the magnetoresistive bridge circuit is electrically connected with one input end of the comparison circuit. The low-power magnetoresistive switch sensor has the advantages of high sensitivity, low power consumption, high frequency response, small size, and excellent thermal characteristics.

Claims20

Dependent claims

A magnetoresistive switch sensor comprising:

an internal reference voltage circuit having a plurality of outputs,
a multiplexer,
a magnetoresistive bridge circuit having an output,
a comparator circuit,
a power regulator circuit having an output,
a digital control circuit having inputs, and
a digital output stage circuit;
the internal reference voltage circuit being connected to ground and to the output of the power regulator circuit, the comparator circuit comprising one or more comparators, being connected to the power regulator circuit and to ground, the comparator circuit having one or more inputs and one or more comparator circuit outputs, the one or more comparator circuit outputs being electrically connected to one of the inputs of the digital control circuit;
the magnetoresistive bridge circuit being electrically connected to the power regulator circuit and to ground, the magnetoresistive bridge circuit output is connected to one input of the comparator circuit;
the multiplexer being controlled by the digital control circuit, the multiplexer determining which of the outputs of the reference voltage circuit are electrically connected to one of the comparator circuit inputs;
the digital control circuit being configured to execute operations based on internal logic states and input signals changes, and having electrical connections to the multiplexer and the digital output stage circuit.

8 more elements

A magnetoresistive switch sensor comprising:

a power regulator circuit configured to provide an output voltage VBias on an output of the power regulator circuit;
an internal reference voltage circuit connected to ground and the output of the power regulator circuit, the internal reference voltage circuit including a plurality of outputs;
a magnetoresistive bridge circuit electrically connected to the power regulator circuit and to ground, the magnetoresistive bridge circuit having an output;
a comparator circuit connected to the power regulator circuit and to ground, the comparator circuit having a sensor signal input, a reference signal input, and an output, the sensor signal input of the comparator circuit being connected to the output of the magnetoresistive bridge circuit;
a multiplexer configured to determine which of the plurality of outputs of the internal reference voltage circuit are electrically connected to the reference signal input of the comparator;
a digital control circuit having a control signal input electrically connected to the output of the comparator circuit, the digital control circuit being configured to receive signals at the control signal input and to execute operations based on internal logic states and the received signals to control the multiplexer;
and
a digital output stage connected to an output of the digital control circuit.

5 more elements

Dependencies are inferred from the claim text.

Low-power magnetic resistance switch sensor

Life of this patent

Low-power magnetic resistance switch sensor

Life of this patent

Abstract

Claims20