Correction arithmetic circuit and a signal processor
AssigneeRohm Co., Ltd.
InventorKazuma Mishima
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Abstract
A correction arithmetic circuit disclosed herein includes an offset temperature characteristic correction unit that corrects an offset temperature characteristic of an input signal according to an input signal characteristic at a specific temperature and a temperature characteristic at a specific input signal. A signal processor disclosed herein includes a pulse count number setting circuit that generates a pulse count number setting signal in accordance with an input signal and a pulse generation unit that generates a pulse signal by counting a pulse number of a reference clock signal according to the pulse count number setting signal. The pulse count number setting circuit corrects the pulse count number setting signal so as to cancel a frequency temperature characteristic of the pulse signal.
Claims16
A correction arithmetic circuit correcting an input signal which was input at an input temperature, the correction arithmetic circuit comprising:
- an offset temperature characteristic correction unit that corrects the input signal according to input signal variation amounts of input signals at a specific temperature from reference temperature input signal values at a reference temperature and input signal variation amounts of a specific input signal at temperatures from a specific input signal value of the specific input signal at the reference temperature.
A correction arithmetic circuit comprising an offset temperature characteristic correction unit that corrects an offset temperature characteristic of an input signal according to an input signal characteristic at a specific temperature and a temperature characteristic of the input signal,
- wherein the offset temperature characteristic correction unit includes:
- a reference correction amount calculation unit that calculates a reference correction amount with respect to the input signal based on the input signal characteristic at the specific temperature,
- a correction coefficient calculation unit that calculates a correction coefficient at a current temperature based on a reference correction amount temperature characteristic at the specific input signal,
- a multiplication unit that calculates a correction amount by multiplying the reference correction amount and the correction coefficient together, and
- a subtraction unit that generates an output signal by subtracting the correction amount from the input signal.
A correction arithmetic circuit comprising:
- an offset temperature characteristic correction unit that corrects an offset temperature characteristic of an input signal according to an input signal characteristic at a specific temperature and a temperature characteristic of the input signal, and
- a gain temperature characteristic correction unit that corrects a gain temperature characteristic of the input signal at a stage before the offset temperature characteristic correction unit.
Dependencies are inferred from the claim text.