A current sink circuit with controllable output voltage

Abstract

The invention provides a current sink circuit with a controllable output voltage. The circuit comprises a biasing module, a feedback module and a first N-channel MOS (Metal Oxide Silicon) transistor,wherein the biasing module comprises at least two first output terminals and at least one first input terminal; the feedback module comprises at least two second output terminals and second input terminals having the same number of the first output terminals; and a source electrode of the N-channel MOS transistor is grounded; the first output terminals of the biasing module are coupled with the second input terminals corresponding to the feedback module; the first input terminals of the biasing module are used as the input terminals of the novel current sink circuit; one of the second output terminals of the feedback module is interconnected with a drain electrode of the first N-channel MOS transistor and used as an output terminal of the novel current sink circuit; the other of the secondoutput terminals of the feedback module is interconnected with a gate electrode of the first N-channel MOS transistor to guarantee that the voltage at the input terminal of the novel current sink circuit is equal to the voltage at the output terminal.

Description

technical field [0001] The invention relates to the technical field of signal processing and transmission in microelectronics technology, in particular to a new type of current sink circuit with controllable output, which is flexible and widely used in various high-speed interfaces, especially in applications requiring this characteristic Applications. Background technique [0002] With the continuous development of integrated circuit technology and process level, the size of transistors and devices on the chip is getting smaller and smaller, the integration of the chip is getting higher and higher, and the speed of the high-speed interface is getting higher and higher. This greatly increases the difficulty of circuit design of integrated circuits. In particular, a large number of multiplexing of analog circuits increases the redundancy of the chip area, so it is required to adopt some simple structures to realize module multiplexing as much as possible to reduce the chip a...

AI Technical Summary

Problems solved by technology

If more current sinks are required for a large number of channels, the structure needs to be multiplexed as a whole, resulting in a larger circuit area

If a circuit with high-speed response is required, it often requires a large-bandwidth op amp, which causes a lot of power consumption to be wasted on the op amp, resulting in an increase in chip area and power consumption.

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