Combination sensor
First Claim
Patent Images
1. A combination sensor, comprising:
- a pressure sensor having an actuator which has a first resonant frequency;
a cavity, coupled to the pressure sensor and able to receive a substance;
wherein the cavity, in an absence of the substance, has a second resonant frequency in response to excitation by the actuator;
wherein the cavity, in a presence of the substance, has a third resonant frequency in response to excitation by the actuator;
wherein the first resonant frequency differs from the second and third resonant frequencies;
a sensor circuit including a driver module configured to excite the actuator, an actuator power level monitor and a detection module,wherein the detection module is configured to output a substance detected signal in response to the third resonant frequency in the cavity;
wherein the sensor circuit is embedded within a semiconductor chip covered by an overmolding layer, wherein the cavity is an opening within the overmolding layer, wherein the opening has a width, a height, and a length, andwherein the first, second and third cavity resonant frequencies are based on the width, height and length of the overmolding layer opening.
1 Assignment
0 Petitions
Accused Products
Abstract
One example discloses a combination sensor, comprising: a pressure sensor having an actuator which has a first resonant frequency; a cavity, coupled to the pressure sensor and able to receive a substance; wherein the cavity, in an absence of the substance, has a second resonant frequency in response to excitation by the actuator; wherein the cavity, in a presence of the substance, has a third resonant frequency in response to excitation by the actuator; wherein the first resonant frequency differs from the second and third resonant frequencies; and a sensor circuit which outputs a substance detected signal in response to the third resonant frequency in the cavity.
4 Citations
19 Claims
-
1. A combination sensor, comprising:
-
a pressure sensor having an actuator which has a first resonant frequency; a cavity, coupled to the pressure sensor and able to receive a substance; wherein the cavity, in an absence of the substance, has a second resonant frequency in response to excitation by the actuator; wherein the cavity, in a presence of the substance, has a third resonant frequency in response to excitation by the actuator; wherein the first resonant frequency differs from the second and third resonant frequencies; a sensor circuit including a driver module configured to excite the actuator, an actuator power level monitor and a detection module, wherein the detection module is configured to output a substance detected signal in response to the third resonant frequency in the cavity; wherein the sensor circuit is embedded within a semiconductor chip covered by an overmolding layer, wherein the cavity is an opening within the overmolding layer, wherein the opening has a width, a height, and a length, and wherein the first, second and third cavity resonant frequencies are based on the width, height and length of the overmolding layer opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A combination gas pressure sensor and carbon dioxide level sensor, comprising:
-
a cavity, coupled to the pressure sensor and coupled to expose the cavity and the pressure sensor to a gas; wherein the gas pressure sensor includes a membrane; wherein the cavity has a predetermined resonant frequency in response to excitation by the membrane when carbon dioxide is in the cavity; a sensor circuit including a driver module configured to excite the membrane, a membrane power level monitor and a detection module, wherein the detection module is configured to output a carbon dioxide detected signal in response to the predetermined resonant frequency in the cavity, wherein the sensor circuit is embedded within a semiconductor chip covered by an overmolding layer, wherein the cavity is an opening within the overmolding layer, wherein the opening has a width, a height, and a length, and wherein the predetermined resonant frequency is based on the width, height and length of the overmolding layer opening.
-
-
16. An article of manufacture comprising at least one non-transitory, tangible machine readable storage medium containing executable machine instructions for operating a combination sensor, the instructions comprising:
-
exciting an actuator in a pressure sensor coupled to a cavity over a range of frequencies; monitoring a power level required to excite the actuator; comparing the actuator power level, at a predetermined frequency dependent upon the cavity dimensions, to a threshold power level; and outputting a substance detected signal if the monitored actuator power level at the predetermined frequency is below the threshold power level; wherein the combination sensor includes a sensor circuit having a driver module configured to excite the actuator, an actuator power level monitor and a detection module; wherein the detection module is configured to output the substance detected signal; wherein the sensor circuit is embedded within a semiconductor chip covered by an overmolding layer, wherein the cavity is an opening within the overmolding layer, wherein the opening has a width, a height, and a length and defines the cavity dimensions, and wherein the predetermined frequency is based on the width, height and length of the overmolding layer opening. - View Dependent Claims (17, 18, 19)
-
Specification