Differential amplifier circuit
A differential amplifying circuit and circuit technology, applied in the directions of differential amplifiers, amplifiers, components of amplifying devices, etc., can solve the problems of large area of differential amplifier circuits, and achieve the effect of reducing area and power consumption
Inactive Publication Date: 2017-09-26
FUJITSU LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
In the differential amplifier circuit, since a common mode feedback circuit for performing feedback control on the common mode voltage of the differential signal is provided, the area occupied by the differential amplifier circuit may become large
Method used
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Embodiment Construction
[0015] Figure 1A with Figure 1B An example of a differential amplifier circuit is shown. The differential amplifier circuit 100 is a fully differential operational amplifier circuit, and includes an input stage 101 and output stages 102 and 103 . Differential signals whose phases are opposite to each other are input to the first differential input node IP and the second differential input node IM. The differential amplification circuit 100 amplifies differential signals input to the first differential input node IP and the second differential input node IM, and outputs the amplified differential signals from the first differential output node OP and the second differential output node OM. The first differential output node OP and the second differential output node OM output differential signals whose phases are opposite to each other. Hereinafter, field effect transistors may be referred to as transistors.
[0016] The first transistor 111 of the input stage 101 may be a...
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A differential amplifier circuit, comprising: a first input node; a second input node; a first output node; a second output node; a first transistor having a gate coupled to the first input node and coupled to the first source of the node; a second transistor having a gate coupled to the second input node; a third transistor having a drain coupled to the drain of the first transistor; a fourth transistor having a drain coupled to The gate of the gate of the third transistor; the first resistor; the second resistor; the fifth transistor, which has a gate coupled to the drain of the first transistor; the sixth transistor, which has a gate coupled to the second a gate of the drain of the transistor; a seventh transistor having a source coupled to the first node; an eighth transistor having a gate coupled to the gate of the seventh transistor; a third resistor; Four resistors.
Description
technical field [0001] Embodiments discussed herein relate to differential amplifier circuits. Background technique [0002] The broadband amplifier includes a differential pair of first and second MOS transistors that performs voltage-current conversion on a differential input signal input to its gate to output a differential output signal. [0003] In the broadband amplifier, the current source including the third MOS transistor and the fourth MOS transistor has a polarity opposite to that of the first MOS transistor and the second MOS transistor, and the gates of the third MOS transistor and the fourth MOS transistor and the drain are respectively coupled through a resistor circuit, thereby serving as a load current source for the differential pair of the first MOS transistor and the second MOS transistor. The first bias circuit sets biases to the inputs of the first MOS transistor and the second MOS transistor. Each of the first capacitive element and the second capaci...
Claims
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IPC IPC(8): H03F3/45H03F1/30
CPCH03F1/0272H03F3/45085H03F3/45197H03F3/45659H03F2203/45418H03F2203/45434H03F2203/45512H03F2203/45526H03F2203/45528H03F2203/45631H03F2203/45694H03F2203/45702H03F2203/45481H03F2200/144H03F2203/45118H03F1/0211H03F3/45179H03F3/45748
Inventor 大石和明
Owner FUJITSU LTD