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Transconductance-enhanced recovery current folded MOS (metal oxide semiconductor) transistor cascade amplifier

A technology of transconductance enhancement and cascode, which is applied in power amplifiers and negative feedback circuit layouts, can solve problems such as high static power consumption, decreased phase margin, and difficulty in achieving bandwidth performance, and achieve improved phase margin, Effect of increasing power consumption and increasing small signal settling time

Active Publication Date: 2011-09-07
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 phase margin is lower than that of traditional folded cascode amplifiers
[0008] 3. In the case of strict power consumption requirements, it is difficult to achieve higher bandwidth performance

Method used

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  • Transconductance-enhanced recovery current folded MOS (metal oxide semiconductor) transistor cascade amplifier
  • Transconductance-enhanced recovery current folded MOS (metal oxide semiconductor) transistor cascade amplifier
  • Transconductance-enhanced recovery current folded MOS (metal oxide semiconductor) transistor cascade amplifier

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Embodiment Construction

[0020] The present invention proposes a transconductance-enhanced recycling current folded MOS transistor cascode amplifier, which is used in figure 2 Among them, the transconductance-enhanced recovery current folded MOS transistor cascode amplifier includes:

[0021] The input stage with enhanced transconductance is composed of four shunted PMOS transistors P1a, P2a, P1b, P2b and two pairs of PMOS transistors P8a, P9a, P8b, P9b, which have the negative resistance characteristics of enhanced transconductance; in order to multiply the input stage transistor Transconductance, wherein the size of the PMOS transistors P8a, P8b, P9a, and P9b is three times the size of the PMOS transistors P1a, P1b, P2a, and P2b, and the sizes of the PMOS transistors P8a, P8b, P9a, and P9b are the same. The sizes of P1a, P1b, P2a, and P2b are the same.

[0022] The intermediate stage for amplifying and recovering current includes the first current mirror composed of NMOS transistors N1, N5 and N7 ...

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Abstract

The invention discloses a transconductance-enhanced recovery current folded MOS (metal oxide semiconductor) transistor cascade amplifier, belonging to the design field of analogue integrated circuits. The amplifier comprises a transconductance-enhanced input stage, an intermediate stage for amplifying a recovery current and a rail-to-rail output stage, wherein the transconductance-enhanced input stage is formed by four shunted PMOS (P-channel metal oxide semiconductor) transistors and four (two pairs of) PMOS transistors constituting negative resistance enhanced transconductance, and used forconverting input voltage signals into four paths of currents and multiplying transconductance of input tubes; the intermediate stage for amplifying the recovery current mainly comprises two low-voltage current mirrors and is used for realizing the amplification of the recovery current; and the rail-to-rail output stage mainly comprises two PMOS transistors and two NMOS (N-channel metal oxide semiconductor) transistors and is used for realizing the rail-to-rail output of signals. The amplifier is capable of improving the bandwidth capability by over two times under the condition of not increasing power consumption, greatly increases low-frequency gains and large-signal slew rate, improves phase margin and enhances performances of a circuit.

Description

technical field [0001] The invention belongs to the field of analog integrated circuit design, in particular to a recuperation current folded MOS transistor cascode amplifier with enhanced transconductance. 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 electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/20H03F1/34
Inventor 方华军赵晓梁仁荣许军王敬
Owner TSINGHUA UNIV
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