Rail-to-rail operational amplifier

A technology of operational amplifiers and operational amplifiers, applied in the direction of differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as input failure and inability to apply design, and achieve the effects of reducing power consumption, meeting design requirements, and meeting low-voltage and low-power consumption

Active Publication Date: 2012-07-11
CSMC TECH FAB2 CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

However, this structural circuit still cannot be applied to the design under the condition of 1.8V power supply voltage
like figure 2 As shown, when the power supply voltage is reduced from 3.3V to 1.8V or even lower, the maximum ICMR of the PMOS input stage will be lower than the minimum ICMR of the NMOS input stage, and the problem of input failure will occur near VDD / 2, although the PMOS input stage Reducing the threshold voltage to Vth0 also cannot solve this problem

Method used

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  • Rail-to-rail operational amplifier

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Embodiment Construction

[0021] A rail-to-rail operational amplifier is an operational amplifier that can operate properly over a common-mode voltage range (often referred to as the rail-to-rail voltage range). Since the power supply voltage decreases rapidly with the reduction of the process feature size, the input / output range of the traditional operational amplifier is also reduced, so the signal-to-noise ratio of the signal is correspondingly reduced; in order to obtain a sufficient signal-to-noise ratio, Op amps are required to be able to handle a rail-to-rail input / output voltage range. Usually, traditional rail-to-rail operational amplifiers are basically multi-stage operational amplifiers composed of operational amplifier input stages and CASCODE output stages. The op amp input stage and CASCODE output stage can handle the rail-to-rail voltage range, and the CASCODE output stage has strong load driving capability and efficiency, so this rail-to-rail operational amplifier can be used as an outp...

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Abstract

The invention discloses a rail-to-rail operational amplifier which comprises an operational amplification input stage, a buck stage and an output stage, wherein the operational amplification input stage comprises a PMOS (P-channel Metal Oxide Semiconductor) input stage and an NMOS (N-channel metal oxide semiconductor) input stage; and the operational amplification input stage also comprises a mirror image input stage, wherein the mirror image input stage, the PMOS input stage and the NMOS input stage are input in parallel. On the premise that the circuit complexity is not obviously increased, the rail-to-rail operational amplifier can be applied to the 1.8V even lower power voltage conditions, the power consumption of the circuit is greatly lowered, and the design requirement of low voltage and low energy consumption can be satisfied.

Description

【Technical field】 [0001] The present invention relates to an integrated circuit design, and more particularly to a monolithic operational amplifier, for rail-to-rail input capability. 【Background technique】 [0002] The industry trend in electronic systems with operational amplifiers is moving towards lower operating voltages from battery sources. In this way, when the amplifier is applied, in addition to the requirements of traditional op amps such as high input impedance, low input bias voltage, low noise, wide bandwidth, high speed and sufficient output drive capability, it also requires a low-voltage single power supply. Although various types of input stages are powered from a single supply voltage source, the low voltage at which the amplifier operates varies depending on the type of input stage and the manufacturing process of the integrated circuit. [0003] A rail-to-rail operational amplifier is an operational amplifier that can operate properly over a common-mode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
Inventor 程亮
Owner CSMC TECH FAB2 CO LTD
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