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Programmable gain amplifier and electronic device

A technology for programming gain and amplifiers, which is applied to components of amplifiers, amplifiers, and improved amplifiers to improve efficiency. It can solve the problems of increased transistor area, low efficiency, and unsatisfactory effects, so as to increase the swing amplitude and improve the application range. , Guarantee the effect of normal work

Active Publication Date: 2018-11-02
SEMICON MFG INT (SHANGHAI) CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

according to due to g m (transconductance) is usually only tens to hundreds of u (carrier mobility), and g m As L (gate length) continues to increase, it decreases, so the method of increasing Vgs by increasing L is inefficient, which will lead to a significant increase in transistor area, and the effect is not ideal

Method used

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  • Programmable gain amplifier and electronic device
  • Programmable gain amplifier and electronic device
  • Programmable gain amplifier and electronic device

Examples

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Embodiment 1

[0037] figure 2 shows a schematic circuit structure diagram of a programmable gain amplifier according to an embodiment of the present invention; image 3 shows a schematic partial circuit structure diagram of a level conversion module of a programmable gain amplifier according to an embodiment of the present invention; Figure 4 A schematic partial circuit structure diagram of a level conversion module of a programmable gain amplifier according to an embodiment of the present invention is shown. Combine below Figure 2 to Figure 4 The programmable gain amplifier according to the embodiment of the present invention is described in detail.

[0038] Please refer to figure 2 , the programmable gain amplifier 200 of this embodiment includes: a pair of input branches 10 and 11, a pair of output branches 20 and 21, a pair of level conversion modules 30 and 31, a pair of discharge modules 40 and 41, and a for bias modules 50 and 51.

[0039]The input branches 10 and 11 include...

Embodiment 2

[0047] Still another embodiment of the present invention provides an electronic device, including the above-mentioned programmable gain amplifier and electronic components connected with the programmable gain amplifier.

[0048] Wherein, the electronic component may be any electronic component such as a discrete device or an integrated circuit.

[0049] The electronic device of this embodiment can be any electronic product or equipment such as mobile phone, tablet computer, notebook computer, netbook, game console, TV set, VCD, DVD, navigator, camera, video recorder, voice recorder, MP3, MP4, PSP, etc. , can also be any intermediate product including the semiconductor device.

[0050] in, Figure 5 An example of a mobile phone is shown. The exterior of the mobile phone 500 is provided with a display portion 502 included in a casing 501, operation buttons 503, an external connection port 504, a speaker 505, a microphone 506, and the like.

[0051] The electronic device in th...

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Abstract

The invention provides a programmable gain amplifier and an electronic device. The programmable gain amplifier comprises a first input branch and a second input branch; the first and second input branches both include an input transistor and a load transistor connected in series; grid electrodes of the load transistors in the input branches are connected with drain electrodes of the input transistors, and a programmable resistor is bridged between a source electrode of the input transistor of the first input branch and a source electrode of the input transistor of the second input branch; a first output branch and a second output branch, wherein the first and second output branches both include load resistors connected in series and a mirror transistor for forming a current mirror with theload transistors; and a level conversion module arranged between the drain electrode of the input transistor and the grid electrode of the load transistor in the same input branch to boost a drain voltage of the input transistor. The programmable gain amplifier provided by the invention increases the amplitude of an input signal. The electronic device has similar advantages.

Description

technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a programmable gain amplifier and an electronic device. Background technique [0002] Programmable Gain Amplifier (PGA) is a common module in analog systems, which can adjust the gain by adjusting the proportional value of the resistor. The input voltage range of the programmable gain amplifier determines the range of the analog signal it can handle, and the change of the output common mode also affects the distortion characteristics of the PGA output signal. How to improve the input voltage range of the PGA and stabilize the output common mode to improve the performance of the output is important for the research of the PGA. At present, the traditional PGA uses NMOS device input, cascode (cascode) current mirror as the first-stage load, and uses programmable resistors to adjust the gain. This kind of PGA input voltage has a small swing, which limits th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/30H03F1/02
CPCH03F1/0211H03G3/30
Inventor 唐华荀本鹏刘飞朱晓明侯舒怡
Owner SEMICON MFG INT (SHANGHAI) CORP