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US 9,429,646 B2Granted
Receiving circuit, semiconductor device, and sensor device
AssigneeRohm Co., Ltd.
InventorsIsao Niwa, Youichiro Noguchi
Life of this patent
Estimating the term…
Abstract
A receiving circuit (10) includes an amplifier (15) which amplifies receiving signals (SP, SN) of a piezoelectric sensor (2), and a plurality of transistors (11a, 11b) or (12a, 12b), which are connected in parallel to between one end of the piezoelectric sensor (2) and one end of the amplifier (15), and are turned on with phase shift when switching is performed to receiving operations.
Claims20
A receiving circuit comprising:
- an amplifier for amplifying a reception signal of a piezoelectric sensor;
- and
- a plurality of transistors connected in parallel between one end of the piezoelectric sensor and one end of the amplifier, the transistors being turned on with phase shift in switching to a reception operation.
A receiving circuit comprising:
- an amplifier for differentially amplifying a reception signal of a piezoelectric sensor;
- a first transistor for connecting between the piezoelectric sensor and the amplifier in switching to a reception operation;
- and
- a second transistor for short-circuiting a positive phase transmission path and a reverse phase transmission path of the reception signal in switching to the reception operation.
1 more element
A receiving circuit comprising:
- an amplifier for amplifying a reception signal of the piezoelectric sensor;
- a main transistor connected between one end of the piezoelectric sensor and one end of the amplifier, the main transistor being turned on in switching to a reception operation;
- and
- a sub transistor connected in parallel to the main transistor, the sub transistor having a larger on-impedance than the main transistor and being turned on prior to the main transistor in switching to the reception operation.
1 more element
Dependencies are inferred from the claim text.