Semiconductor device having variable parameter selection based on temperature and test method
First Claim
1. An apparatus comprising:
- a first temperature-sensing circuit configured to provide a first temperature indication based on a first temperature threshold resistance, wherein the first temperature-sensing circuit includes;
a first amplifier comprising a first positive input and a first negative input, wherein the first negative input is configured to be driven by a temperature-independent signal;
a first transistor electrically connected to the first positive input, wherein the first transistor is configured to be controlled by a temperature signal; and
a first temperature hysteresis resistance, wherein the first temperature hysteresis resistance and the first temperature threshold resistance are both electrically connected in series to the first positive input, and wherein the first hysteresis resistance is configured to be controlled, at least in part, by an output of the first amplifier;
a driver circuit including first and second driver outputs, wherein the driver circuit is configured to;
receive the first temperature indication;
provide a first output voltage to the first driver output if the first temperature indication is in a first state; and
provide a second output voltage to the first driver output if the first temperature indication is in a second state; and
a second amplifier configured to amplify a third output voltage from the second driver output and provide the amplified third output voltage back to the driver circuit.
5 Assignments
0 Petitions
Accused Products
Abstract
A semiconductor device that may include temperature sensing circuits is disclosed. The temperature sensing circuits may be used to control various parameters, such as internal regulated supply voltages, internal refresh frequency, or a word line low voltage. In this way, operating specifications of a semiconductor device at worst case temperatures may be met without compromising performance at normal operating temperatures. Each temperature sensing circuit may include a selectable temperature threshold value as well as a selectable temperature hysteresis value. In this way, temperature performance characteristics may be finely tuned. Furthermore, a method of testing the temperature sensing circuits is disclosed in which a current value may be monitored and temperature threshold values and temperature hysteresis values may be thereby determined.
95 Citations
21 Claims
-
1. An apparatus comprising:
-
a first temperature-sensing circuit configured to provide a first temperature indication based on a first temperature threshold resistance, wherein the first temperature-sensing circuit includes; a first amplifier comprising a first positive input and a first negative input, wherein the first negative input is configured to be driven by a temperature-independent signal; a first transistor electrically connected to the first positive input, wherein the first transistor is configured to be controlled by a temperature signal; and a first temperature hysteresis resistance, wherein the first temperature hysteresis resistance and the first temperature threshold resistance are both electrically connected in series to the first positive input, and wherein the first hysteresis resistance is configured to be controlled, at least in part, by an output of the first amplifier; a driver circuit including first and second driver outputs, wherein the driver circuit is configured to; receive the first temperature indication; provide a first output voltage to the first driver output if the first temperature indication is in a first state; and provide a second output voltage to the first driver output if the first temperature indication is in a second state; and a second amplifier configured to amplify a third output voltage from the second driver output and provide the amplified third output voltage back to the driver circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method comprising:
-
sensing a first temperature with a first temperature-sensing circuit configured to provide a first temperature indication based on a first temperature threshold resistance, wherein the first temperature-sensing circuit includes; a first amplifier comprising a first positive input and a first negative input, wherein the first negative input is configured to be driven by a temperature-independent signal; a first transistor electrically connected to the first positive input, wherein the first transistor is configured to be controlled by a temperature signal; and a first temperature hysteresis resistance, wherein the first temperature hysteresis resistance and the first temperature threshold resistance are both electrically connected in series to the first positive input, and wherein the first temperature hysteresis resistance is configured to be controlled, at least in part, by an output of the first amplifier; driving a first driver output of a driver circuit, wherein the first driver output is driven with; a first voltage if the first temperature indication is in a first state; and a second voltage if the first temperature indication is in a second state; amplifying a third voltage from a second driver output of the driver circuit; and providing the amplified third voltage back to the driver circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification