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Rail-to-rail amplifier

A technology of amplifiers and bipolar transistors, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to reduce noise effects, etc., can solve the problem of reducing the output signal-to-noise ratio, reducing the power supply rejection ratio, and reducing the voltage margin, etc. problem, achieve the effect of reducing power consumption, improving power supply rejection ratio, and increasing the range

Inactive Publication Date: 2016-04-20
AAC ACOUSTIC TECH (SHENZHEN) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1) The MOS tube has a large flicker noise in the input stage. The flicker noise covers from DC to several megahertz. As an audio amplifier, flicker noise is the main noise, which will significantly reduce the output signal-to-noise ratio
[0005] 2) When the input signal value is close to VDD, the P-type input branch current decreases, and the voltage margin becomes smaller, which causes the power supply rejection ratio of the output terminal to decrease
[0007] A) The current gain of the bipolar transistor β=I C / I B , too low in CMOS process

Method used

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] see figure 1 , figure 1 Shown is a structural diagram of a fully differential input circuit of a rail-to-rail amplifier in an embodiment of the present invention.

[0032] In this embodiment, the rail-to-rail amplifier includes: an input signal path with an input voltage range biased toward VDD, including a bipolar transistor Q 7 and the bipolar transistor Q 8 ; Input signal path with input voltage range biased towards GND, including bipolar transistor Q 1 emitter and bipolar transistor Q 2 the emitter, by tracking the current source I 1 and I 2 provides current to the emitter followe...

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Abstract

The invention relates to a rail-to-rail amplifier. The rail-to-rail amplifier comprises an input signal path whose input voltage range is biased to VDD (Voltage Drain Drain), an input signal path whose input voltage range is biased to GND (Ground), a source coupling pair, namely a field effect transistor M1 and a field effect transistor M2, a source coupling pair, namely a field effect transistor M3 and a field effect transistor M4, an input end and an output end, wherein the input signal path whose input voltage range is biased to VDD comprises a bipolar transistor Q7 and a bipolar transistor Q8; the input signal path whose input voltage range is biased to GND comprises an emitter of a bipolar transistor Q1 and an emitter of a bipolar transistor Q2, and current is provided for the bipolar transistor Q1 and the bipolar transistor Q2 of an emitter follower through following current sources I1 and I2. According to the rail-to-rail amplifier in the invention, the power consumption of the amplifier is reduced, the power supply rejection ratio is improved, the noise is reduced and the input and output amplitude is increased.

Description

【Technical field】 [0001] The present invention relates to circuits, in particular to a rail-to-rail amplifier. 【Background technique】 [0002] In the field of microphone integrated circuits, the amplifier is used as an output driver amplifier, and the output driver amplifier needs to meet low power consumption, low noise (high signal-to-noise ratio), high power supply rejection ratio (especially for the noise at 217Hz at the VDD terminal), and high AOP (AcousticOverloadPoint) rail-to-rail input and output range. [0003] Traditional rail-to-rail amplifiers use a parallel P-type CMOS and N-type CMOS source-coupled pair as the input stage, which leads to the following problems: [0004] 1) The MOS tube has a large flicker noise in the input stage, and the flicker noise covers from DC to several megahertz. As an audio amplifier, flicker noise is the main noise, which will significantly reduce the output signal-to-noise ratio. [0005] 2) When the input signal value is close t...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F3/45
Inventor 韩冬蔡东记戴有祥
Owner AAC ACOUSTIC TECH (SHENZHEN) CO LTD