Sensor interface circuit and sensor module
AssigneesNisshinbo Micro Devices Inc., Tokyo Institute of Technology, Alps Alpine Co., Ltd.
InventorsHiroki Sato, Masayuki Sato, Noboru Ishihara, Shinji Murata
Life of this patent
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Abstract
A sensor interface circuit includes: an RF switch having a control node; a bias circuit electrically connected to the control node and applying, to the control node, a voltage at a first level or a second level corresponding to a linear region of a reflection characteristic; a first variable oscillation circuit electrically connectable to a first sensor; a second variable oscillation circuit electrically connectable to a second sensor; and a difference circuit electrically connected between the first variable oscillation circuit and the bias circuit, and between the second variable oscillation circuit and the bias circuit.
Claims11
A sensor interface circuit comprising:
- an RF switch having a control node;
- a bias circuit electrically connected to the control node and applying, to the control node, a voltage at a first level or a second level corresponding to a linear region of a reflection characteristic within which the RF switch operates;
- a first variable oscillation circuit electrically connectable to a first sensor;
- a second variable oscillation circuit electrically connectable to a second sensor;
- and
- a difference circuit electrically connected between the first variable oscillation circuit and the second variable oscillation circuit, and the bias circuit.
A sensor module comprising:
- an antenna;
- a first sensor;
- a second sensor;
- and
- a sensor interface circuit comprising:
- an RF switch having a control node;
- a bias circuit electrically connected to the control node and applying, to the control node, a voltage at a first level or a second level corresponding to a linear region of a reflection characteristic within which the RF switch operates;
- a first variable oscillation circuit electrically connectable to the first sensor;
- a second variable oscillation circuit electrically connectable to the second sensor;
- and
- a difference circuit electrically connected between the first variable oscillation circuit and the second variable oscillation circuit, and the bias circuit,
- wherein the sensor interface circuit is electrically connected between the first sensor and the second sensor, and the antenna.
Dependencies are inferred from the claim text.