Bias circuit having a start-up circuit
AssigneeSamsung Electronics Co., Ltd.
InventorsJae-jun Moon, Jeong-won Lee, Jung-eun Lee
Life of this patent
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Abstract
Disclosed is a bias circuit having a start-up circuit. The bias circuit having a start-up circuit has a bias circuit part using a current mirror circuit, and for generating a constant bias voltage to an output node from an application of a power source voltage, and a start-up circuit part having a capacitor connected between the output node and a common node of in common connecting gates of MOS transistors constructing the current mirror circuit. Accordingly, the bias circuit prevents noise delivered from a power source voltage and power consumption due to static currents, and eliminates the oscillation possibility with stability improved in a high frequency range.
Claims3
A bias circuit having a start-up circuit, comprising:
- a bias circuit part using a current mirror circuit, and for generating a constant bias voltage to an output node from a power source voltage as applied, and
- a start-up circuit part having a capacitor connected between the output node and a common node of in common connecting gates of MOS transistors constructing the current mirror circuit.
A bias circuit having a start-up circuit, comprising:
- a bias circuit part using a cascode current mirror circuit of a double-stage current mirror circuit, and for generating a constant bias voltage to an output node from an applied power source voltage;
- and
- a start-up circuit part for actuating the bias circuit part upon an initial application of the power source voltage, the start-up circuit part including:
- a first capacitor connected between a first common node connecting in common gates of first MOS transistors constructing a first single-stage current mirror circuit of the cascode current mirror circuit and a second common node connecting in common gates of second MOS transistors constructing a second single-stage current mirror circuit;
- and
- a second capacitor connected between the second common node and the output node.
Dependencies are inferred from the claim text.