Symmetrically-folded MOS (metal oxide semiconductor) transistor cascade amplifier with broadband and low-power consumption

Abstract

The invention discloses a symmetrically-folded MOS (metal oxide semiconductor) transistor cascade amplifier with broadband and low-power consumption, belonging to the design field of analogue integrated circuits. The amplifier comprises a shunt input stage, a recovery-current amplifying intermediate stage and a rail-to-rail output stage, wherein the shunt input stage is formed by four PMOS (P-channel metal oxide semiconductor) transistors; the recovery-current amplifying intermediate stage is used for converting input voltage signals into four paths of small signal currents and formed by two low-voltage current mirrors as well as is used for amplifying recovery currents; and the rail-to-rail output stage is formed by four PMOS transistors and two NMOS (N-channel metal oxide semiconductor)transistors and used for realizing rail-to-rail output of signals. The amplifier is capable of improving the bandwidth capability by over two times under the condition of not adding power consumption, has the advantages of higher common-mode rejection ratio, symmetrical positive-negative conversion rate, higher low-frequency gain and the like, and can improve performances of a circuit.

Description

technical field [0001] The invention belongs to the field of analog integrated circuit design, in particular to a broadband low power consumption symmetrical folded MOS transistor cascode amplifier. Background technique [0002] Since the 20th century, with the development of submicron and ultra-deep submicron technology and the increasing maturity of system chip technology, portable electronic products powered by batteries have achieved rapid development and rapid popularization. Since the development of battery technology is far behind the development of electronic systems, products ranging from heart pacemakers to hearing aids, mobile phones and various products have imposed strict restrictions on the supply voltage of electronic products. On the other hand, as the size of the device continues to shrink, the breakdown voltage of the process is also reduced, which also imposes strict restrictions on the power supply voltage. The performance requirements of electronic devi...

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Problems solved by technology

[0006] 1. Compared with other types of amplifiers, its static power consumption is high

[0007] 2. The current sources MN6 and MN8 are only used as current sources and are not used to transmit small signal currents, which is a kind of "waste".

[0008] 3. In the case of strict power consumption requirements, it is difficult to achieve high bandwidth performance

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