Semiconductor device and variation information obtaining program
First Claim
1. A semiconductor device, comprising:
- an oscillation circuit, including a transistor, configured to output a signal having a predetermined frequency; and
a control circuit, coupled to the oscillation circuit, configured to;
output a current set value to set an operation current of the oscillation circuit to a first current value,obtain first frequency information related to the frequency of the output signal of the oscillating circuit when the operation current is set to the first current value,output the current set value to set the operation current of the oscillation circuit to a second current value,obtain second frequency information related to the frequency of the output signal of the oscillation circuit when the operation current is set to the second current value,obtain manufacture variation information, including a variation amount of a threshold voltage of the transistor, based on a difference between the first and second frequency information, andcorrect the current set value used for oscillating operation of the oscillator circuit based on the variation amount of the threshold voltage of the transistor.
2 Assignments
0 Petitions
Accused Products
Abstract
A conventional semiconductor device has a problem that acquisition of variation information of circuit elements constructing the semiconductor device is not easy. According to an embodiment, a semiconductor device has a control circuit which makes an oscillation circuit operate by at least two operation current values, obtains first frequency information related to frequency of an output signal corresponding to a first operation current value and second frequency information related to frequency of an output signal corresponding to a second operation current value, and obtains manufacture variation information of a circuit element on the basis of the difference between the first and second frequency information.
13 Citations
16 Claims
-
1. A semiconductor device, comprising:
-
an oscillation circuit, including a transistor, configured to output a signal having a predetermined frequency; and a control circuit, coupled to the oscillation circuit, configured to; output a current set value to set an operation current of the oscillation circuit to a first current value, obtain first frequency information related to the frequency of the output signal of the oscillating circuit when the operation current is set to the first current value, output the current set value to set the operation current of the oscillation circuit to a second current value, obtain second frequency information related to the frequency of the output signal of the oscillation circuit when the operation current is set to the second current value, obtain manufacture variation information, including a variation amount of a threshold voltage of the transistor, based on a difference between the first and second frequency information, and correct the current set value used for oscillating operation of the oscillator circuit based on the variation amount of the threshold voltage of the transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A non-transitory computer-readable medium having instructions stored thereon that, when executed by a processor, execute a method for controlling an oscillation circuit, the controlling comprising:
-
outputting, by a control circuit, a current set value to set an operation current of the oscillation circuit to a first current value, obtaining first frequency information related to the frequency of the output signal of the oscillating circuit when the operation current is set to the first current value, outputting the current set value to set the operation current of the oscillation circuit to a second current value, obtaining second frequency information related to the frequency of the output signal of the oscillation circuit when the operation current is set to the second current value, obtaining manufacture variation information, including a variation amount of a threshold voltage of a transistor of the oscillation circuit, based on a difference between the first and second frequency information, and correcting the current set value used for oscillating operation of the oscillator circuit based on the variation amount of the threshold voltage of the transistor. - View Dependent Claims (15, 16)
-
Specification