Amplifying circuit with pull-up and pull-down circuit to increase turning rate

Abstract

The invention discloses an amplification circuit, comprising an amplifier, a pull-up amplifier and a pull-down amplifier. The amplifier produces a first pull-up control signal, a first pull-down control signal and an output signal. The phases of both the pull-up control signal and the pull-down control signal are reverse to the phase of the output signal; the pull-up circuit comprises a first control module (that exports a second pull-up control signal according to the first pull-up control signal) and a first adjusting module (that adjusts the output signal according to the second pull-up control signal). The pull-down control module comprises a second control module (that exports a second pull-down control signal according to the first pull-down control signal) and a second adjusting module (that adjusts the output signal according to the second pull-down signal).

Description

technical field [0001] The invention provides an amplifying circuit, especially an amplifying circuit with a pull-up circuit and a pull-down circuit to increase the slew rate. Background technique [0002] Features such as high resolution, light and thin size, long standby time and power saving are the future trends of TFT displays. Returning to the level of driver IC design means reducing chip area and reducing power consumption. Therefore, in the driver IC design architecture, an amplifier circuit that can drive high loads is required. When the amplifying circuit drives a high load, it will face problems such as static power consumption, too large chip area and too low slew rate. [0003] refer to figure 1 , figure 1 It is a schematic circuit diagram of a traditional amplifying circuit 100 that can increase the slew rate. Such as figure 1 As shown, the amplifying circuit 100 includes an operational amplifier 110 and a slew rate enhancing circuit 120 . Please note tha...

AI Technical Summary

Problems solved by technology

Obviously, the disadvantage of the conventional amplifying circuit 100 is: the condition for the slew rate enhancement circuit 120 to start and shut down is that the voltage difference between the input terminal and the output terminal needs to exceed a critical voltage V th , In this way, the operating voltage range of enhanced slew rate is reduced, coupled with the body effect of the source follower, the efficiency is even worse

[0005] In addition, various conventional techniques are available today to deal with the problems associated with increasing the slew rate, for example, according to US Patent No. 6,392,485, which discloses a static operation of a differential pair input stage controlled by a signal fed back from a loop current to solve the situation that the internal slew rate is too slow; in addition, according to US Pat. The problem that the slew rate is too small

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