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US 7,126,434 B2Granted
Oscillator circuit for semiconductor device
AssigneeHynix Semiconductor Inc.
InventorSeok Joo Lee
Life of this patent
Estimating the term…
Abstract
An oscillator circuit for a semiconductor device is disclosed which can generate internal clocks having a stable period regardless of variations of a process of transistors and resistors, a power voltage and a temperature, by controlling an oscillator unit by separating a gate voltage and a reference voltage, and which can normally operate chip functions according to the stable internal clocks without suffering from large variations by external factors.
Claims11
An oscillator circuit for a semiconductor device, comprising:
- a reference voltage generating unit for generating a reference voltage according to an enable signal and a band-gap voltage, and varying a voltage level of the reference voltage to compensate for a variation of a period of an internal clock signal by external factors;
- a gate voltage generating unit driven according to the enable signal, for generating a gate voltage by voltage distributions of a power voltage, and varying a voltage level of the gate voltage to compensate for the variation of the period of the internal clock signal by external factors;
- and
- an oscillator unit for generating the internal clock signal having a predetermined period according to the enable signal, the reference voltage and the gate voltage.
1 more element
An oscillator circuit for a semiconductor device, comprising:
- a reference voltage generating unit for generating a reference voltage according to an enable signal and a band-gap voltage, and varying a voltage level of the reference voltage to compensate for a variation of a period of an internal clock signal by external factors;
- a gate voltage generating unit driven according to the enable signal, for generating a gate voltage by voltage distributions of a poxver voltage, and varying a voltage level of the gate voltage to compensate for the variation of the period of the internal clock signal by external factors;
- and
- an oscillator unit for generating the internal clock signal having a predetermined period according to the enable signal, the reference voltage and the gate voltage,
- wherein the reference voltage generating unit comprises:
- an input voltage decreasing unit for decreasing the power voltage to a predetermined level according to the enable signal and the band-gap voltage, and outputting the resulting voltage as a first voltage;
- an output control unit for distributing the first voltage, and generating a second voltage varied due to variations of a threshold voltage of the device and a temperature in order to compensate for the period of the internal clock signal by external factors;
- and
- an output unit for increasing a voltage level of the second voltage, and outputting the resulting voltage as the reference voltage.
6 more elements
Dependencies are inferred from the claim text.