Suggested Uses
This mirror circuit is for applications such as high accuracy A/D and D/A converters, reference cells, and high current comparators.
Advantages
Current mirror circuits, common to analog and mixed-signal circuits offer wide bandwidth and have been developed in bipolar, MOS and BiCMOS technologies. Improvements in their designs have been numerous, each enhancement aimed at specific problems and its application. Generally, in CMOS technology, the dependency of the output current on the voltage strongly affects both current mirror configurations. Also the up mirror depends upon the P transistors and the down mirror depends upon the N transistors, each with different characteristics which give rise to matching problems of the two mirrors. In this invention, the performances of the two current mirror topologies are matched. Thus, compared to other topologies, the circuit topology of this invention offers several notable advantages which include ease of design, close to ideal up and down mirroring, insensitivity to power supply variations of the up and down mirrored currents and good operational insensitivity to process parameter variations, thereby requiring no trimming or self-calibration.
Innovation Details
Detailed Description
This invention relates to current mirror circuits useful especially in analog and mixed-signal integrated circuits and particularly to a current mirror circuit that provides very high precision and a wide range of current divisions, for applications such as high accuracy A/D and D/A converters, reference cells, and high current comparators.
Current mirror circuits, common to analog and mixed-signal circuits offer wide bandwidth and have been developed in bipolar, MOS and BiCMOS technologies. Improvements in their designs have been numerous, each enhancement aimed at specific problems and its application. Generally, in CMOS technology, the dependency of the output current on the voltage strongly affects both current mirror configurations. Also the up mirror depends upon the P transistors and the down mirror depends upon the N transistors, each with different characteristics which give rise to matching problems of the two mirrors. In this invention, the performances of the two current mirror topologies are matched. Thus, compared to other topologies, the circuit topology of this invention offers several notable advantages which include ease of design, close to ideal up and down mirroring, insensitivity to power supply variations of the up and down mirrored currents and good operational insensitivity to process parameter variations, thereby requiring no trimming or self-calibration.
Current mirror circuits, common to analog and mixed-signal circuits offer wide bandwidth and have been developed in bipolar, MOS and BiCMOS technologies. Improvements in their designs have been numerous, each enhancement aimed at specific problems and its application. Generally, in CMOS technology, the dependency of the output current on the voltage strongly affects both current mirror configurations. Also the up mirror depends upon the P transistors and the down mirror depends upon the N transistors, each with different characteristics which give rise to matching problems of the two mirrors. In this invention, the performances of the two current mirror topologies are matched. Thus, compared to other topologies, the circuit topology of this invention offers several notable advantages which include ease of design, close to ideal up and down mirroring, insensitivity to power supply variations of the up and down mirrored currents and good operational insensitivity to process parameter variations, thereby requiring no trimming or self-calibration.
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