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Differential amplifiers and semiconductor circuit

A differential amplifier and semiconductor technology, applied in the direction of differential amplifiers, amplifiers, DC-coupled DC amplifiers, etc., can solve the problem that the differential amplifier cannot provide sufficient gain

Active Publication Date: 2007-05-09
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So under low current and / or low voltage operation, traditional differential amplifiers will not be able to provide enough gain to operate normally in high speed applications

Method used

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  • Differential amplifiers and semiconductor circuit
  • Differential amplifiers and semiconductor circuit
  • Differential amplifiers and semiconductor circuit

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Embodiment Construction

[0026] FIG. 1 is a schematic diagram of an embodiment of the differential amplifier of the present invention. As shown in the figure, the differential amplifier 100 includes a differential input stage (Differential Input Stage), four fixed current sources (Fixed Current Source) 101-104, resistive components (hereinafter referred to as resistors R1, R2a and R2b), and A current-folding element (Current-Folding Element). In the present invention, due to its structural relationship, the differential amplifier 100 is used to convert the difference between the input voltages Vi+ and Vi- into the voltage difference between the source voltages (nodes N2 and N4) of the transistors M1 and M2, so A current Ir1 is generated to flow to the resistor R1, so that the currents Im3 and Im4 respectively flowing through the transistors M3 and M4 are adjusted accordingly. Since the sources of the transistors M3-M6 are coupled to the positive supply voltage Vdd, the gates of the transistors M3 and...

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Abstract

Differential amplifiers comprise a differential input stage, first, second, third, and fourth fixed current sources, a first resistive element, and a current-folding element. Due to topology thereof, the differential amplifier converts the difference between the input voltages to the voltage difference between the source voltages of the transistors in the differential pair, and a current is induced through the first resistive element, thereby generating two currents. The current-folding element folds the two currents to generate output voltages.

Description

technical field [0001] The invention relates to a differential amplifier and a semiconductor circuit. Background technique [0002] Differential amplifiers are widely used in analog circuits and digital circuits, and are used between two signals to amplify the voltage difference between two input signals. Ideally, a difference amplifier would only amplify the voltage difference between the two input signals while filtering out common-mode input changes such as noise. Therefore, difference amplifiers are found in circuit applications where signals contain noise. For example, a digital signal transmitted in a long cable will carry various noise signals during the signal transmission process. The differential amplifier is used to filter out these noise signals, and at the same time amplify the digital signal to return to the original signal. [0003] Unfortunately, traditional difference amplifiers suffer from a number of disadvantages. For example, the linear operating reg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/32
CPCH03F2203/45028H03F3/45197H03F1/3211
Inventor 屈庆勋
Owner MEDIATEK INC