Self-biased cascode current mirror having high voltage swing and low power consumption
First Claim
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1. A self-biased cascode current mirror circuit, comprising:
- a resistive element having a first terminal for providing a bias voltage in response to receiving an input current, and a second terminal;
a first transistor having a first current electrode coupled to the second terminal of the resistive element, a control electrode coupled to the first terminal of the resistor for receiving the bias voltage, and a second current electrode;
a second transistor having a first current electrode coupled to the second current electrode of the first transistor, a control electrode coupled to the first current electrode of the first transistor, and a second current electrode coupled to a power supply voltage terminal;
a third transistor having a first current electrode for providing an output current, a control electrode for receiving the bias voltage, and a second current electrode; and
a fourth transistor having a first current electrode coupled to the second current electrode of the third transistor, a control electrode coupled to the first current electrode of the first transistor, and a second current electrode coupled to the power supply voltage terminal.
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Abstract
A self-biased cascode current mirror includes a current mirror (60), and a cascode bias generator (50). The cascode bias generator (50) includes a resistor (51) to provide a bias voltage for the current mirror (60). The current mirror (60) includes cascode transistor (64) and two mirror transistors (62, 63). The bias voltage is approximately equal to a minimum saturation voltage of the cascode transistor (64) plus a gate-source voltage of the transistor (63) of the current mirror (60). The self-biased cascode current mirror (60) has a high output impedance and high voltage swing while providing low power consumption and requiring a small layout area.
71 Citations
7 Claims
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1. A self-biased cascode current mirror circuit, comprising:
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a resistive element having a first terminal for providing a bias voltage in response to receiving an input current, and a second terminal; a first transistor having a first current electrode coupled to the second terminal of the resistive element, a control electrode coupled to the first terminal of the resistor for receiving the bias voltage, and a second current electrode; a second transistor having a first current electrode coupled to the second current electrode of the first transistor, a control electrode coupled to the first current electrode of the first transistor, and a second current electrode coupled to a power supply voltage terminal; a third transistor having a first current electrode for providing an output current, a control electrode for receiving the bias voltage, and a second current electrode; and a fourth transistor having a first current electrode coupled to the second current electrode of the third transistor, a control electrode coupled to the first current electrode of the first transistor, and a second current electrode coupled to the power supply voltage terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification