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Output circuit of calculation amplifier

A technology for output stage circuits and operational amplifiers, applied in differential amplifiers, DC coupled DC amplifiers, etc., can solve the problems of output stage output efficiency reduction, complex circuit structure, high input impedance, etc., to increase the maximum output current and improve span The effect of guiding and simplifying the circuit

Active Publication Date: 2009-09-16
RDA TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The class AB output stage requires a constant voltage source circuit. In order to avoid affecting the gain of the previous stage, its input impedance must be relatively high, which is more complicated to implement. After adding a constant voltage source circuit, the output efficiency of the entire output stage is also greatly reduced. , and the circuit structure is more complex

Method used

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Embodiment Construction

[0015] The output stage circuit of operational amplifier of the present invention can refer to image 3 As shown, it includes two triodes M1 and M2 whose drains are connected together, the drain of the triode M1 and the drain of M2 are used as output terminals, the source of the triode M2 ​​is connected to the power supply terminal, and the source of the triode M1 The pole is grounded, the gate of the triode M1 is used as an input terminal, the gate of the triode M2 ​​is connected to a resistor R1, and the end of the resistor R1 not connected to the triode M2 ​​is used as a voltage bias input terminal, the triode M1 A capacitor C1 is connected between the gate of M2 and the gate of M2.

[0016] The transistor M1 is an NMOS transistor, the transistor M2 is a PMOS transistor, the input terminal vin is connected to the gate of the transistor M1, the source of the transistor M1 is grounded to avss, and the drain of the transistor M1 is connected to the drain of the M2, which toget...

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Abstract

The invention discloses an output stage circuit of an operational amplifier, which comprises two triodes M1 and M2 whose drains are connected together, the drain of the triode M1 and the drain of M2 serve as output terminals, and the source of the triode M2 connected to the power supply terminal, the source of the triode M1 is grounded, the gate of the triode M1 is used as an input terminal, the gate of the triode M2 ​​is connected to a resistor R1, and one end of the resistor R1 not connected to the triode M2 ​​is used as A voltage bias input terminal, a capacitor C1 is connected between the gates of the triode M1 and M2. The present invention omits the part of the constant voltage source circuit by adding capacitance between the gates of the two triodes, greatly simplifies the circuit, increases the transconductance of the circuit, increases the maximum output current, and improves the performance of the output stage. output efficiency.

Description

technical field [0001] The invention relates to an analog circuit, in particular to an output stage circuit of an operational amplifier. Background technique [0002] The operational amplifier is a key component in the design of analog circuits, and it is widely used in the design of filters, digital-to-analog converters, and analog-to-digital converters. [0003] An operational amplifier consists of an internal gain stage and an output stage, where the output stage is primarily designed to drive a load. In order to obtain a larger output voltage swing with a small load resistance, the output stage is required to output a large current. And a large load capacitor also requires a large output current to provide the required charge and discharge current in order to meet the requirements of transient response. [0004] Nowadays, the methods of implementing the output stage of operational amplifiers are usually implemented, including Class A amplifiers and Class AB push-pull a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45
Inventor 魏述然周震
Owner RDA TECH
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