Integrated circuit with improved on-chip power supply control
First Claim
1. An integrated circuit, comprising:
- functional circuitry biased at a bias node;
a terminal for receiving a power supply voltage; and
a circuit, coupled to said terminal, for biasing said bias node of said functional circuitry with a clamped voltage responsive to said power supply voltage at said terminal exceeding a first limit.
1 Assignment
0 Petitions
Reexamination
Accused Products
Abstract
An on-chip power supply regulation system for a VLSI circuit such as a dynamic RAM is disclosed. The system includes a high power supply voltage detection circuit and a power supply clamp circuit, where a clamped voltage generated by the clamp circuit biases the functional circuitry when the high power supply voltage detection circuit detects an overvoltage conditions. The bias voltage applied to the functional circuitry in the normal operating condition can be a regulated voltage generated from the power supply voltage. Further included in the disclosed circuit is a burn-in voltage generation circuit and a burn-in voltage detection circuit, which can apply an accelerated voltage which depends upon the applied power supply voltage, when the power supply voltage is higher than during normal operation but lower than in the overvoltage condition enabling the clamp operation. A multiplexer connects the regulated voltage, the clamped voltage, or the accelerated voltage, to the circuit depending upon the level of the external power supply voltage. In this way, the offset between the accelerated voltage and the external power supply voltage can be optimized independently from the power supply voltage at which the accelerated voltage is enabled.
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Citations
16 Claims
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1. An integrated circuit, comprising:
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functional circuitry biased at a bias node; a terminal for receiving a power supply voltage; and a circuit, coupled to said terminal, for biasing said bias node of said functional circuitry with a clamped voltage responsive to said power supply voltage at said terminal exceeding a first limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An integrated circuit, comprising:
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functional circuitry biased at a bias node; a terminal for receiving a power supply voltage; a voltage regulator circuit, coupled to said terminal, for providing a regulated bias voltage; a stress voltage circuit, coupled to said terminal, for providing a stress voltage; and a multiplexer, receiving said regulated bias voltage and said stress voltage at its inputs, and having an output coupled to said bias node, for connecting said regulated bias voltage or said stress voltage to said bias node responsive to the voltage at said terminal. - View Dependent Claims (16)
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11. The circuit of claim 11, further comprising:
a high voltage detection circuit, having an input coupled to said terminal and having an output coupled to said multiplexer, for controlling said multiplexer responsive to the voltage at said terminal. - View Dependent Claims (12, 13, 14, 15)
Specification