A Low Power Wideband Fully Differential Operational Amplifier

An operational amplifier, fully differential technology, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to expand bandwidth, etc., can solve problems such as unacceptable current consumption, and achieve the effect of low power consumption and large bandwidth

Active Publication Date: 2018-12-11
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Abstract
  • Description
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Problems solved by technology

This is obviously unacceptable in terms of current consumption for circuits that would use multiple op amps, filters and ADCs

Method used

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  • A Low Power Wideband Fully Differential Operational Amplifier
  • A Low Power Wideband Fully Differential Operational Amplifier

Examples

Experimental program
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Embodiment Construction

[0013] figure 1 and 2 The specific implementation of the diagram illustrating the circuit is as follows: the tail current source transistor M 1 and the input transistor M 2 m 3 composed of the input section, and the load transistor of the amplifier M 4 and M 5 . Resistance R 1 , R 2 and capacitance C 1 ,C 2 A common-mode feedback network is used to set the output common-mode voltage of the first-stage amplifier; the transistor M connected to the input and output of the op amp 7 and M 8 consists of a feed-forward path, and consists of a transistor M 9 , M 10 and M 11 , M 12 Composed of the second-stage amplifying circuit load, the resistor R 3 , R 4 and capacitance C 3 ,C 4 The composed common-mode feedback network is used to set the output common-mode voltage of the second-stage amplifier; the NMOS transistor M 13 and M 15 composed of a current mirror, and a diode-connected PMOS transistor M 14 composition. figure 1 and figure 2 The difference is made b...

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Abstract

The invention relates to a lower-power-consumption broadband fully differential operational amplifier, and belongs to the field of analogue integrated circuits. An operational amplifier circuit is of a feed-forward zero compensation circuit structure. On the basis of an amplifier of a two-stage structure, a feed-forward path from input to output is additionally introduced, and in this way, a left half-plane zero point is formed on the basis of two poles and performs compensation on the phase to achieve stable operational amplification. Because miller compensation is not adopted for the structure, compared with the miller compensation structure, the position of the main pole is higher, and the lower-power-consumption broadband fully differential operational amplifier is more suitable for lower-power-consumption high bandwidth circuit design. The lower-power-consumption broadband fully differential operational amplifier is simple in structure, needs lower power consumption under the condition of meeting the requirement of achieving broadband application, and can meet the requirements of a wireless broadband communication system well.

Description

technical field [0001] The invention relates to a wide-band fully differential operational amplifier with low power consumption, especially used in an intermediate frequency circuit of a wide-band wireless communication transceiver, and belongs to the field of analog integrated circuit design. Background technique [0002] Due to the rapid development of broadband wireless communication, the bandwidth frequency of intermediate frequency circuits such as filters and ADC circuits in transceivers is generally above 10MHz, and some high-speed wireless communication protocols even reach the order of 100MHz, which requires high requirements. It is required that the bandwidth of the operational amplifier used in these circuits should be relatively large. However, the traditional Miller compensation is used to move the output pole to the direction away from the origin, so that the pole between the two stages moves to the origin. If the 3dB bandwidth of the frequency-compensated two...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45H03F1/42
Inventor 郄利波李罗生
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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