Input and output amplifier based on asymmetrical complementation

Abstract

The invention provides a constant trans-conductance full-swing input circuit based on asymmetrical complementation and an amplifier. The constant trans-conductance full-swing input circuit based on asymmetrical complementation comprises a first field effect transistor, a second field effect transistor, a first differential pair transistor, a second differential pair transistor, a first current mirror and a second current mirror; the source of the first field effect transistor is connected to one end of a Zener diode; the other end of the Zener diode is connected to the source of the second field effect transistor; the gate of the first differential pair transistor receives a difference input signal; the gate of the second differential pair transistor receives a difference output signal; the first current mirror is connected to the first differential pair transistor; and the second current mirror is connected to the second differential pair transistor, wherein the field effect transistors comprise a P type transistor and an N type transistor respectively. By means of the constant trans-conductance full-swing input circuit based on asymmetrical complementation disclosed by the invention, the circuit based on asymmetrical complementation is relatively simple; a better trans-conductance stability effect can be realized; the output-stage frequency compensation difficulty is reduced; the circuit can be applied in the amplifier having high bandwidth and high conversion rate; and furthermore, the method is simple.

Description

technical field [0001] The present invention relates to the technical field of differential amplifiers, more specifically, to an asymmetric complementary constant transconductance full-swing input circuit and an amplifier. Background technique [0002] In the modern deep submicron CMOS process, the power consumption and process requirements make the voltage of the single power supply smaller and smaller, but because the threshold voltage cannot be reduced in the same proportion, the operating range of the traditional single differential pair amplifier and the power supply voltage Getting smaller and smaller. For example, in the 0.6μm process, the single power supply voltage is 5V, the threshold voltage is about 0.7V, and the operating range is 86% of the supply voltage, while in the 0.18μm process, the supply voltage is 1.8V, and the threshold voltage is about 0.4 V, the operating range is 78% of the supply voltage. [0003] With the further development of the process, the...

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Problems solved by technology

[0003] With the further development of the process, the power supply voltage is getting smaller and smaller, the proportion of the working range will be smaller and smaller, and the reduction of the common mode range will reduce the ability of the single differential pair amplifier to process signals, NMOS differential pair and PMOS differential pair Parallel as a complementary input stage can achieve an operating voltage range from the highest voltage to the lowest voltage, but simple paralleling will cause a two-fold change in the transconductance of the input stage, which increases the difficulty of frequency compensation in the output stage

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