Ring Oscillator
First Claim
1. A ring oscillator comprising:
- a current control unit, including a basic current source having a series circuit formed of a first P channel transistor, the drain and the gate of which are connected, and a first N channel transistor, the drain of which is connected to the drain of the first P channel transistor and which, to supply a sub-threshold current, is operated in a weak inversion state, and a current mirror circuit having a series circuit formed of a second P channel transistor, the gate of which is connected to the drain of the first P channel transistor, a second N channel transistor, the drain and the gate of which are connected to the drain of the second P channel transistor; and
a ring oscillation unit, including a current starved inverter, having a current control P channel transistor, the source of which is connected to the power source and the gate of which is connected to the drain of the first P channel transistor of the basic current source, a signal transmission P channel transistor, the source of which is connected to the drain of the current control P channel transistor, a signal transmission N channel transistor, the drain of which is connected to the drain of the signal transmission P channel transistor, and a current control N channel transistor, the drain of which is connected to the source of the signal transmission N channel transistor, the gate of which is connected to the drain of the second N channel transistor of the current mirror circuit, and the source of which is grounded, wherein a connection point of the gate of the signal transmission P channel transistor and the gate of the signal transmission N channel transistor serves as a signal input terminal, and a connection point of the drain of the signal transmission P channel transistor and the drain of the signal transmission N channel transistor serves as an output terminal for outputting an inverted signal; and
an in-phase signal transmitter for receiving an input signal from the output terminal of the current starved inverter, and for outputting, to the input terminal of the current starved inverter and to an external device, a signal having the same phase as the input signal.
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Accused Products
Abstract
A ring oscillator according to the present invention comprises:
a ring oscillation unit, including
a current starved inverter CSI having a current control P channel transistor P2, a signal transmission P channel transistor P3, a signal transmission N channel transistor N3 and a current control N channel transistor N2, and
an in-phase signal transmitter receiving a signal from the current starved inverter, and outputting an in-phase signal to the current starved inverter; and
a current control unit, including
a basic current source having P channel transistor P10 and an N channel transistor N10 which is operated in a weak inversion state and flows a subthreshold current, and
a current mirror circuit having a P channel transistor P12 current-mirror connected to the P channel transistors P10 and P2, and an N channel transistor N12 current-mirror connected to the N channel transistor N2.
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Citations
20 Claims
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1. A ring oscillator comprising:
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a current control unit, including a basic current source having a series circuit formed of a first P channel transistor, the drain and the gate of which are connected, and a first N channel transistor, the drain of which is connected to the drain of the first P channel transistor and which, to supply a sub-threshold current, is operated in a weak inversion state, and a current mirror circuit having a series circuit formed of a second P channel transistor, the gate of which is connected to the drain of the first P channel transistor, a second N channel transistor, the drain and the gate of which are connected to the drain of the second P channel transistor; and
a ring oscillation unit, including a current starved inverter, having a current control P channel transistor, the source of which is connected to the power source and the gate of which is connected to the drain of the first P channel transistor of the basic current source, a signal transmission P channel transistor, the source of which is connected to the drain of the current control P channel transistor, a signal transmission N channel transistor, the drain of which is connected to the drain of the signal transmission P channel transistor, and a current control N channel transistor, the drain of which is connected to the source of the signal transmission N channel transistor, the gate of which is connected to the drain of the second N channel transistor of the current mirror circuit, and the source of which is grounded, wherein a connection point of the gate of the signal transmission P channel transistor and the gate of the signal transmission N channel transistor serves as a signal input terminal, and a connection point of the drain of the signal transmission P channel transistor and the drain of the signal transmission N channel transistor serves as an output terminal for outputting an inverted signal; and
an in-phase signal transmitter for receiving an input signal from the output terminal of the current starved inverter, and for outputting, to the input terminal of the current starved inverter and to an external device, a signal having the same phase as the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 17, 18, 19, 20)
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13. A ring oscillator comprising:
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a current control unit, including a basic current source having a series circuit formed of a first P channel transistor, the drain and the gate of which are connected, and a first N channel transistor, the drain of which is connected to the drain of the first P channel transistor and which, to supply a sub-threshold current, is operated in a weak inversion state, a current mirror circuit having a series circuit formed of a second P channel transistor, the gate of which is connected to the drain of the first P channel transistor, a second N channel transistor, the drain and the gate of which are connected to the drain of the second P channel transistor; and
a ring oscillation unit, including a current starved inverter, having a current control P channel transistor, the source of which is connected to the power source and the gate of which is connected to the drain of the first P channel transistor of the basic current source, a signal transmission P channel transistor, the source of which is connected to the drain of the current control P channel transistor, a signal transmission N channel transistor, the drain of which is connected to the drain of the signal transmission P channel transistor, and a current control N channel transistor, the drain of which is connected to the source of the signal transmission N channel transistor, the gate of which is connected to the drain of the second N channel transistor of the current mirror circuit, and the source of which is grounded, a Schmit trigger circuit, for outputting an in-phase signal of an input signal, a circuit threshold value of which represents a hysteresis characteristic relative to the change of the input signal, and the output terminal of which is connected to the input terminal of the current starved inverter, a resistance setting circuit, located between the output terminal of the current starved inverter and the input terminal of the Schmit trigger circuit, and formed of a parallel connection of multiple series circuits, each having a resistor and a switching element, and a capacitance setting circuit, located between the input terminal of the Schmit trigger circuit and the ground terminal, and formed of a parallel connection of multiple series circuits, each having a capacitor and a switching element. - View Dependent Claims (14, 15, 16)
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Specification