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US 10,704,907 B2Granted
Circuit device, electronic apparatus, moving object and method of manufacturing of physical quantity detection device
AssigneeSeiko Epson Corporation
InventorsTeppei Higuchi, Katsuhiko Maki
Life of this patent
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Abstract
A circuit device includes a clock signal generation circuit that generates a clock signal through an oscillation circuit, and a detection circuit including a circuit operating through an operation signal based on the clock signal. The clock signal generation circuit includes a first frequency adjustment unit which is capable of adjusting an oscillation frequency before an physical quantity transducer and the circuit device are connected to each other, and a second frequency adjustment unit which is capable of adjusting the oscillation frequency in a state where the physical quantity transducer and the circuit device are connected to each other.
Claims15
A circuit device comprising:
- a clock signal generation circuit, including an oscillation circuit, which generates a clock signal through the oscillation circuit;
- and
- a detection circuit, including a circuit operating through an operation signal based on the clock signal, to which a detection signal from a physical quantity transducer is input,
- wherein the clock signal generation circuit includes
- a first frequency adjustment circuit and a second frequency adjustment circuit configured to adjust an oscillation frequency of the oscillation circuit,
- wherein the oscillation circuit is a CR oscillation circuit,
- the first frequency adjustment circuit is a variable resistance circuit of the CR oscillation circuit, and
- the second frequency adjustment circuit is a variable capacitance circuit of the CR oscillation circuit, and
- wherein the variable resistance circuit includes
- a plurality of resistive elements which are connected in series to each other, and
- a plurality of fuse elements in which each fuse element is provided in parallel to each resistive element of the plurality of resistive elements.
8 more elements
A circuit device comprising:
- a clock signal generation circuit, including an oscillation circuit, which generates a clock signal through the oscillation circuit;
- a detection circuit, including a circuit operating through an operation signal based on the clock signal, to which a detection signal from a physical quantity transducer is input,
- wherein the clock signal generation circuit includes a first frequency adjustment circuit and a second frequency adjustment circuit configured to adjust an oscillation frequency of the oscillation circuit,
- wherein the oscillation circuit is a CR oscillation circuit,
- wherein the first frequency adjustment circuit is a variable resistance circuit of the CR oscillation circuit, and
- wherein the second frequency adjustment circuit is a variable capacitance circuit of the CR oscillation circuit;
- and
- a voltage generation circuit that generates a power supply voltage, and supplies the power supply voltage to the oscillation circuit,
- wherein the voltage generation circuit generates a power supply voltage for compensating for temperature characteristics of the oscillation frequency of the oscillation circuit,
- wherein the oscillation frequency in a case where the power supply voltage is a fixed voltage has positive temperature characteristics, and
- the voltage generation circuit generates the power supply voltage having negative temperature characteristics on the basis of a work function difference of a transistor, and supplies the power supply voltage as a power supply of the oscillation circuit.
8 more elements
A circuit device comprising:
- a clock signal generation circuit, including an oscillation circuit, which generates a clock signal through the oscillation circuit;
- a detection circuit, including a circuit operating through an operation signal based on the clock signal, to which a detection signal from a physical quantity transducer is input,
- wherein the clock signal generation circuit includes a first frequency adjustment circuit and a second frequency adjustment circuit configured to adjust an oscillation frequency of the oscillation circuit,
- wherein the oscillation circuit is a CR oscillation circuit,
- wherein the first frequency adjustment circuit is a variable resistance circuit of the CR oscillation circuit, and
- wherein the second frequency adjustment circuit is a variable capacitance circuit of the CR oscillation circuit;
- and
- a drive circuit that receives a feedback signal from the physical quantity transducer, and drives the physical quantity transducer,
- wherein when the oscillation frequency of the oscillation circuit is set to fos, i is set to an integer of 1 or greater, j is set to an integer of 1 or greater, and a frequency of the operation signal is set to fos/i, the oscillation frequency fos is set so that a relation of j×fdr≠fos/i is established, and wherein fdr corresponds to a drive frequency of the physical quantity transducer.
6 more elements
Dependencies are inferred from the claim text.