Low-power high-gain circulation type folding type cascade amplifier

A cascode, high-gain technology, applied in the electrical field, can solve problems such as doubling power consumption, not getting better use of transistors, and reducing the frequency response of amplifiers

Inactive Publication Date: 2015-10-14
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Multi-stage cascaded amplifier: due to the use of complex compensation methods, the frequency response of the amplifier is seriously reduced;
[0006] 2. Transconductance doubling technology: due to the introduction of a low-gain, high-bandwidth preventive stage, the power consumption is doubled;
exist figure 1 In the circuit shown, we noticed that the two transistors N1 and N2 conduct the most current, so they have the largest transconductance, but these two transistors are only used as current sinks
Previous work to improve the performance of folded op amps has used a variety of designs, but the two transistors N1 and N2 have never been better utilized

Method used

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  • Low-power high-gain circulation type folding type cascade amplifier
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  • Low-power high-gain circulation type folding type cascade amplifier

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Embodiment Construction

[0087] The amplifier of the present invention is designed on the basis of the traditional folded cascode amplifier and the idea of ​​circulating current and the technology of conductance offset. The designed amplifier not only has lower power consumption, but also has higher gain .

[0088] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0089] The low-power consumption and high-gain circular folded cascode amplifier of the present invention is composed of a main amplifier and a conductance canceling circuit.

[0090] 1. Main amplifier

[0091] refer to figure 2 , the main amplifier is mainly composed of nine PMOS transistors P1, P2, P3, P4, P5, P6, P7, P8, P9 and ten NMOS transistors N10, N11, N12, N13, N14, N15, N16, N17, N44, N45 composed of:

[0092] The source terminal of P1 is connected to the drain terminal of P5, and the drain terminal of P1 is connected to the drain terminal of ...

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PUM

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Abstract

The invention discloses a low-power high-gain circulation type folding type cascade amplifier. The cascade amplifier is characterized in that the amplifier is formed by a main amplifier and an electric conductance offsetting circuit. In the main amplifier, an N44 and an N45 are crossly coupled, so equivalent transconductance of the amplifier is increased while the total current is unaltered, thereby increasing the gain of the amplifier. The electric conductance offsetting circuit is formed by a first electric conductance offsetting circuit CIRCUIT_P and a second electric conductance offsetting circuit CIRCUIT_N. The electric conductance offsetting circuit CIRCUIT_P or CIRCUIT_N detects the node voltage of source ends of cascade pipes P8, P9 (N12, N13) and generates feedback voltage to control a negative conductance generating circuit so as to allow the generated negative conductance to be functions of a top PMOS: P6, P7 (bottom NMOS: N10, N11) electric conductance so as to follow and offset gds of the top PMOS or the bottom NMOS. If two sides of the PMOS and the NMOS completely offset the electric conductance of the top PMOS and the bottom NMOS, the output resistance and zero-frequency gain are infinite, so performance of the amplifier can be remarkably improved.

Description

technical field [0001] The invention relates to a cascode amplifier, in particular to a low power consumption and high gain loop-type folded cascode amplifier, belonging to the technical field of electricity. Background technique [0002] One of the main circuit structures of analog integrated circuits is the operational transconductance amplifier, which is the module that consumes the most power in many applications. Due to the low-voltage trend of CMOS technology, folded op amps have recently become more figure 1 ) has received more attention, although the power consumption of the folding op amp is higher. Moreover, the PMOS-driven folded op amp has become the best choice for op amp applications due to its lower flicker noise, higher secondary point, and lower input common-mode level. However, PMOS-driven folding op amps also increase input capacitance and power dissipation. [0003] In addition, with the continuous reduction of the CMOS process size, in the deep sub-mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/30
Inventor 谢梦琳朱樟明田征杨银堂刘敏杰
Owner XIDIAN UNIV
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