Cascode amplifier biasing method, cascode amplifier biasing device and cascode amplifier biasing circuit

A cascode, amplifying circuit technology, applied in the parts, amplifiers, differential amplifiers and other directions of the amplifying device, can solve the problem of unable to stabilize the gain of the cascode amplifier, and achieve the effect of stabilizing the gain
CN114094947APending Publication Date: 2022-02-25ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
Publication Date
2022-02-25

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Abstract

The invention discloses a cascode amplifier biasing method, a cascode amplifier biasing device and a cascode amplifier biasing circuit. The biasing method comprises the following steps: a first lowest saturation drain-source voltage corresponding to a drain-source voltage of an input tube in a cascode amplifier and a second lowest saturation drain-source voltage corresponding to a drain-source voltage of a cascode tube are acquired; according to the first lowest saturation drain-source voltage and the second lowest saturation drain-source voltage, the gate bias voltage of the cascode tube is set, so that the drain-source voltage of the input tube is larger than or equal to the first lowest saturation drain-source voltage, and the drain-source voltage of the cascode tube is larger than or equal to the second lowest saturation drain-source voltage. According to the value of the first lowest saturation drain-source voltage and the value of the second lowest saturation drain-source voltage, the gate bias voltage of the cascode tube is set, so that the drain-source voltage of the input tube is larger than or equal to the first lowest saturation drain-source voltage, and the drain-source voltage of the cascode tube is larger than or equal to the second lowest saturation drain-source voltage. Therefore, the cascode amplifier can obtain stable gain.
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Description

Technical field

[0001] The present invention relates to the field of electronic circuit technology, and more particularly to a conventional centrifugal biasing method, apparatus, and a bias circuit. Background technique

[0002] In order to increase the low frequency gain of the operational amplifier on the basis of the new low frequency pole, a congenital split amplifier is usually employed as a first magnitude, the second level amplifier uses a common source amplifier or push-pull structure that is biased in the current source. The first level of the commonly supplied amplifier is used to provide a large gain, but only small current drive capability; the second level is usually used as a driving level, and its gain is small, but the driving ability is large. The common gate amplifier is composed of input tubes, a common gate tube, and a common gateway, input tube and common gate tube, called a common source, and the second magnitude consists of a gain tube and a load tube. The ...

Claims

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