Current subtraction circuit

Abstract

The invention discloses a current subtraction circuit, which comprises nine transistors, wherein a drain end of the transistor M1 is connected with an input current signal I1, and a drain end of the transistor M5 is connected with an input current signal I2; a source end of the transistor M1 and a gate end and a drain end of the transistor M3 are respectively connected with a gate end of the transistor M4; a source end of the transistor M2 is connected with a drain end of the transistor M4; a source end of the transistor M5 and a gate end and a drain end of the transistor M7 are respectively connected with a gate end of the transistor M8; a source end of the transistor M6 is connected with a drain end of the transistor M8; and a drain end of the transistor M2, a drain end of the transistorM6 and a gate end of the transistor M9 are respectively connected with a source end of the transistor M9. The current subtraction circuit has the advantages of being small in area, low in power consumption, low in cost, high in integration level and the like, the channel length modulation effect of the transistor under the micro-nano technology can be well restrained, and therefore the linearityand accuracy degree of the current subtraction circuit are improved.

Description

technical field [0001] The invention relates to a current subtraction circuit, which belongs to the field of integrated circuits. Background technique [0002] In circuit design, it is usually necessary to perform subtraction operation on two signals. In the existing technology, it is mainly realized through an operational amplifier. However, this method not only has a complex structure, but also has a large area and power consumption, which cannot meet the needs of miniaturization. [0003] In Chinese patent CN110275567, a current subtraction circuit is proposed, which can realize linear subtraction of current, and has the characteristics of low input impedance and high output impedance. However, an operational amplifier is used in this current subtraction circuit, which increases the circuit area and power consumption. [0004] In addition, due to the development of Moore's law, the size of devices is shrinking year by year, making the short-channel effect more and more...

AI Technical Summary

Problems solved by technology

However, this current subtraction circuit uses an operational amplifier, which increases the circuit area and power consumption.

[0004] In addition, due to the development of Moore's law, the device size is shrinking year by year, making the short channel effect more and more serious

Designing op amps that suppress short-channel effects is complex and increases cost

Therefore, the existing current subtraction circuit cannot meet the integration requirements of low power consumption, small area and low cost

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