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AB type super-source follower circuit and differential AB type super-source follower circuit

A source-following, circuit technology, applied in the direction of logic circuit connection/interface layout, logic circuit coupling/interface using field effect transistors, etc., can solve problems such as circuit failure, low output impedance, etc., to ensure stability and overcome signal frequency. The effect of limiting and guaranteeing the output amplitude range

Pending Publication Date: 2020-07-10
深圳能芯半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although this class AB super source tracking circuit can achieve low output impedance, output and absorb large current, but due to the use of capacitor C1 for AC coupling, when the frequency of the input signal is very low or DC, the circuit cannot work

Method used

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  • AB type super-source follower circuit and differential AB type super-source follower circuit
  • AB type super-source follower circuit and differential AB type super-source follower circuit
  • AB type super-source follower circuit and differential AB type super-source follower circuit

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specific Embodiment 1

[0032] A kind of AB class super source follower circuit of the present invention, as figure 2 As shown, it includes an input circuit, an output circuit, a folding circuit, and a bias circuit. The input end of the input circuit is used to transmit the input signal to the follower circuit. The first end of the input circuit is connected to the first end of the output circuit and acts as a class AB The output terminal of the super-source follower circuit transmits the output signal; the second terminal of the input circuit is connected to the first terminal of the folding circuit, the second terminal of the output circuit is connected to the second terminal of the folding circuit and the first terminal of the bias circuit, and the output The third terminal of the circuit is connected to the third terminal of the folding circuit and the second terminal of the bias circuit, the bias circuit is used to set the bias voltage of the output circuit, and the folding circuit is used to co...

specific Embodiment 2

[0034] A class AB super source follower circuit of the present application, such as image 3 As shown, the input circuit includes a first current source I1 and a first transistor M1, the gate of the first transistor M1 is used as the input terminal of the follower circuit to transmit the input signal Vin, and its source is used as the second terminal of the input circuit, connected to The output terminal of the first current source I1 and the output terminal Vout of the output circuit, the drain of which serves as the third terminal of the input circuit, is connected to the connection point of the fourth transistor M4 and the fifth transistor M5 in series of the folding circuit. The first current source I1 is connected to the positive terminal of the power supply to provide a bias current for the first transistor M1.

[0035] Wherein, the first transistor M1 is a P-type MOS transistor.

[0036] The folding circuit includes a bias circuit and a folding sub-circuit. The bias circ...

specific Embodiment 3

[0061] A kind of differential AB super source follower circuit of the present invention, as Figure 4 As shown, it includes the first input circuit, the second input circuit, the first output circuit, the first output circuit, the first folding circuit, the second folding circuit, and the bias circuit, including the first input circuit and the second input circuit to form a differential The input circuit, whose input terminals are respectively used as the positive and negative input terminals of the input signal; the first output circuit and the first output circuit form a differential output circuit, and whose output terminals are respectively used as the positive and negative output terminals of the output signal; the first folding circuit, the second The folding circuit forms a differential folding circuit, and its control terminals are respectively connected to the first input circuit and the second terminal of the second input circuit; the second terminal and the third ter...

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Abstract

The invention discloses an AB type super-source follower circuit and a differential AB type super-source follower circuit. The AB type super-source follower circuit comprises an input circuit, an output circuit, a folding circuit and a bias circuit, two ends of the input circuit are respectively connected with a first end of the folding circuit and a first end of the output circuit; the other endof the folding circuit and one end of the bias circuit are connected with the other end of the output circuit at the same time, the input end of the input circuit is the input end of the AB type super-source follower circuit, and the first end of the output circuit is the output end of the AB type super-source follower circuit; the bias circuit is used for providing bias setting for the output circuit, and the folding circuit is used for expanding the swing amplitude of the control end of the output circuit. A differential AB type super-source follower circuit is formed based on the AB type super-source follower circuit. The bias circuit sets bias voltage for the output circuit, so that the completeness of output signals of a follower is ensured, and full-band following is realized; the folding circuit and the bias circuit are combined, negative feedback of the follower circuit is achieved, and output is stabilized.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a class AB super source follower circuit and a differential class AB super source follower circuit. Background technique [0002] In the field of semiconductor design technology, the follower circuit is a very commonly used circuit. Generally, the source follower circuit is used. The source follower circuit has high input impedance and low output impedance, and is usually used as a buffer stage for input signals. The basic source The pole follower circuit includes a MOS tube and a current source circuit, but its output impedance is still a bit high, which cannot meet the requirements. In order to reduce the output impedance, output and absorb large current, and increase the power, the basic source follower circuit is improved to form Class AB super source tracking circuit, such as figure 1 As shown, the mirror current source circuit and capacitive coupling circuit are sup...

Claims

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Application Information

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IPC IPC(8): H03K19/0185
CPCH03K19/0185
Inventor 闸钢黄勍隆冯显声
Owner 深圳能芯半导体有限公司