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Power-saving enhanced slew rate system of operational amplifier output stage

A technology of operational amplifiers and output stages, applied in the direction of DC-coupled DC amplifiers, differential amplifiers, etc., can solve problems such as static current consumption, achieve the effects of reducing current consumption, increasing slew rate, and eliminating steady-state current

Active Publication Date: 2015-04-29
ORISE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in static state, transistors MP#2 and MN#2 still have static current consumption
Therefore, there is still room for improvement in techniques known to enhance slew

Method used

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  • Power-saving enhanced slew rate system of operational amplifier output stage
  • Power-saving enhanced slew rate system of operational amplifier output stage
  • Power-saving enhanced slew rate system of operational amplifier output stage

Examples

Experimental program
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Embodiment Construction

[0027] image 3 It is a circuit diagram of an enhanced slew rate system 300 of a power-saving operational amplifier output stage according to an embodiment of the present invention. The enhanced slew rate system 300 includes an operational amplifier 310, a first-stage amplifying circuit 320, a current supply / current The inhaled enabling circuit 330 and a second stage amplifying circuit 340 .

[0028] The operational amplifier 310 has a non-inverting input terminal (+), an inverting input terminal (-), a first output terminal (A) and a second output terminal (B), the non-inverting input terminal (+ ) receives an input signal (VIN), the inverting input terminal (-) is connected to a load output terminal (OUT) to receive a load output signal (VOUT), and the operational amplifier 310 connects the input signal (VIN) to the load The differential amplification of the output signal (VOUT) is used to generate a first control signal at the first output terminal and a second control sig...

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Abstract

The invention provides a power-saving enhanced slew rate system of an operational amplifier output stage. When an input signal is greater than a load output signal, an enabling circuit for current supply / current suction produces a current supply signal, so that a second-level amplification circuit supplies current to a load output end. When the input signal is smaller than the load output signal, the enabling circuit for current supply / current suction produces a current suction signal, so that the second-level amplification circuit sucks the current from the load output end. When the input signal is equal to the load output signal, the enabling circuit for current supply / current suction produces a closing signal, so that the enabling circuit for current supply / current suction and the second-level amplification circuit are closed.

Description

technical field [0001] The present invention relates to the technical field of operational amplifiers, in particular to an enhanced slew rate system for power-saving operational amplifier output stages. Background technique [0002] In order to achieve high slew rate (Slew Rate) requirements of known operational amplifiers, the improvement methods include increasing the current of the differential input pair (Differential Input Pair) or reducing the compensation capacitance (Compensation Capacitance), however, the former increases the quiescent current consumption (Steady Current Consumption), while the latter sacrifices the stability of the operational amplifier. figure 1 It is a circuit diagram of a known enhanced slew rate technology, which uses a push-pull (Push-pull) output stage output to enhance the slew rate, that is, an additional circuit is added to achieve this purpose. However figure 1 When the circuit is static, the transistors MP and MN will have static curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45
Inventor 陈冠翰黄健群郑彦诚
Owner ORISE TECH CO LTD