Internal voltage generating circuit
First Claim
1. An internal voltage generating circuit for pumping charge to generate an internal driving voltage, comprising:
- a first oscillation signal generating unit that provides a first oscillation signal in response to a detected internal voltage and a predetermined test mode signal, the first oscillation signal having a first period;
a second oscillation signal generating unit that divides an external clock to provide a second oscillation signal having a variable oscillation period, the second oscillation signal having a second period that is different from the first period; and
a switching unit that selects an output from the first oscillation signal or the second oscillation signal in response to the predetermined test mode signal and provides the selected signal as a pumping period signal.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is an internal voltage generating circuit that pumps charge to generate an internal driving voltage. The internal voltage generating circuit includes: a first oscillation signal generating unit that provides a first oscillation signal in response to a detected internal voltage and a predetermined test mode signal; a second oscillation signal generating unit that divides an external clock to provide a second oscillation signal having a variable oscillation period; and a switching unit that selects the first oscillation signal or the second oscillation signal in response to the predetermined test mode signal and provides the selected signal as a pumping period signal.
-
Citations
25 Claims
-
1. An internal voltage generating circuit for pumping charge to generate an internal driving voltage, comprising:
-
a first oscillation signal generating unit that provides a first oscillation signal in response to a detected internal voltage and a predetermined test mode signal, the first oscillation signal having a first period; a second oscillation signal generating unit that divides an external clock to provide a second oscillation signal having a variable oscillation period, the second oscillation signal having a second period that is different from the first period; and a switching unit that selects an output from the first oscillation signal or the second oscillation signal in response to the predetermined test mode signal and provides the selected signal as a pumping period signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. An internal voltage generating circuit comprising:
-
a voltage detector that detects the level of an internal voltage fed back and provides an oscillation control signal; a pumping signal generating block that provides a pumping period signal having a first period that is a fixed period and that is oscillated by a ring oscillator in response to the oscillation control signal, and provides as the pumping period signal a clock signal having a second period that is a variable period and that is generated by dividing an external clock in a test mode; and a charge pump that pumps charge in response to the pumping period signal to output the internal voltage, wherein the first period of the pumping period signal having the fixed period and the second period of the pumping period signal having the variable period are generated to be different periods, and wherein the pumping period signal generating unit comprises a switching unit that selects an output from a first oscillation signal or a second oscillation signal in response to the predetermined test mode signal, and provides the selected signal as the pumping period signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
Specification