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A programmable gain amplifier and electronic device

A technology for programming gain and amplifiers, which is applied to components of amplifiers, amplifiers, improved amplifiers to improve efficiency, etc., can solve problems such as low efficiency, increased transistor area, and unsatisfactory effects, so as to improve the application range and increase the swing , The effect of improving the application range

Active Publication Date: 2022-06-28
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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  • A programmable gain amplifier and electronic device
  • A programmable gain amplifier and electronic device
  • A programmable gain amplifier and electronic device

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Embodiment 1

[0037] figure 2 A schematic circuit structure diagram of a programmable gain amplifier according to an embodiment of the present invention is shown; image 3 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; 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 will be 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 pair of For biasing modules 50 and 51 .

[0039]The input bra...

Embodiment 2

[0047] Yet another embodiment of the present invention provides an electronic device, including the above programmable gain amplifier and an electronic component connected to the programmable gain amplifier.

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

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

[0050] in, Figure 5 An example of a cell phone is shown. The exterior of the cellular 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 according to the embod...

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Abstract

The invention provides a programmable gain amplifier and an electronic device. The programmable gain amplifier includes: first and second input branches, the first and second input branches both include an input transistor and a load transistor connected in series, and the gate of the load transistor in the input branch is connected to the drain of the input transistor , and a programmable resistor is connected between the source of the input transistor of the first input branch and the source of the input transistor of the second input branch; the first and second output branches, the first and second output branches Each includes a load resistor connected in series and a mirror transistor for forming a current mirror with the load transistor; a level conversion module, and the level conversion module is arranged on the drain of the input transistor and the load transistor in the same input branch between the gates of the input transistor to boost the drain voltage of the input transistor. The programmable gain amplifier increases the swing of the input signal. The electronic device has similar advantages.

Description

technical field [0001] The present 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, and the gain can be adjusted by adjusting the proportional value of the resistor. The input voltage range of the programmable gain amplifier determines the range of analog signals that 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 how to stabilize the output common mode to improve the output performance is the important research of PGA. At present, the traditional PGA uses NMOS device input, cascode (cascode) current mirror as the first stage load, and uses programmable resistance to adjust the gain. This PGA input voltage swing is small, which limits the PG...

Claims

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Application Information

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Patent Type & Authority Patents(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