Circuit device, oscillator, and method for manufacturing oscillator
AssigneeSeiko Epson Corporation
InventorTakehiro Yamamoto
Life of this patent
Estimating the term…
Abstract
A circuit device includes a clock signal generation circuit that generates a clock signal, an output circuit that outputs an output clock signal based on the clock signal, and a clock terminal that outputs the output clock signal. The circuit device further includes a test terminal, a storage circuit that stores a duty adjustment value, and a duty adjustment circuit that adjusts a duty of the clock signal based on the duty adjustment value. The output circuit outputs a first DC voltage based on a normal rotation signal of the clock signal to the test terminal in a first state. The output circuit outputs a second DC voltage based on a reverse rotation signal of the clock signal to the test terminal in a second state.
Claims10
A circuit device comprising:
- a clock signal generation circuit configured to generate a clock signal;
- an output circuit configured to output an output clock signal based on the clock signal;
- a clock terminal configured to output the output clock signal;
- a test terminal;
- a storage circuit configured to store a duty adjustment value;
- and
- a duty adjustment circuit configured to adjust a duty of the clock signal based on the duty adjustment value, wherein
- the output circuit
- outputs a first DC voltage based on a normal rotation signal of the clock signal to the test terminal in a first state, and
- outputs a second DC voltage based on a reverse rotation signal of the clock signal to the test terminal in a second state.
A method for manufacturing an oscillator including a circuit device,
- the circuit device including:
- a clock signal generation circuit configured to generate a clock signal;
- an output circuit configured to output an output clock signal based on the clock signal;
- a clock terminal configured to output the output clock signal;
- a test terminal;
- a storage circuit configured to store a duty adjustment value;
- and
- a duty adjustment circuit configured to adjust a duty of the clock signal based on the duty adjustment value, the method for manufacturing an oscillator comprising:
- setting the circuit device to a first state in which the output circuit outputs a first DC voltage based on a normal rotation signal of the clock signal to the test terminal;
- measuring the first DC voltage;
- setting the circuit device to a second state in which the output circuit outputs a second DC voltage based on a reverse rotation signal of the clock signal to the test terminal;
- measuring the second DC voltage;
- and
- setting the duty adjustment value based on a difference value between the first DC voltage and the second DC voltage and writing the set duty adjustment value to the storage circuit.
Dependencies are inferred from the claim text.