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Programmable gain amplifier

A programming gain and amplifier technology, applied in the direction of analog-to-digital converters, etc., can solve the problems of not being able to save the capacitor CF area, and cannot provide a variety of control mechanisms, so as to achieve the effect of saving the capacitor area and reducing the area

Inactive Publication Date: 2009-10-28
SUNPLUS TECH CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] However, in the aforementioned programmable gain amplifier 300, only the capacitor C F Used as a feedback capacitor
In other words, the programmable gain amplifier 300 can only achieve the purpose of gain control by adjusting the equivalent capacitance value of the sampling capacitor, which not only cannot provide a variety of control mechanisms, but also cannot save the capacitor C F the area of

Method used

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  • Programmable gain amplifier
  • Programmable gain amplifier

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Embodiment Construction

[0034] The programmable gain amplifier of the present invention will be described in detail below with reference to the drawings.

[0035] Figure 4A It is a schematic diagram of the first embodiment of the programmable gain amplifier 400 of the present invention. In this embodiment, the programmable gain amplifier 400 is a 4-bit programmable gain amplifier. The programmable gain amplifier 400 includes an operational amplifier 110, two groups (N+1 groups) of adjusting capacitor modules 402, 404, two groups (N+1 groups) of switch modules 406, 408, and a feedback switch S F , One (N) attenuation capacitor C SC , A feedback capacitor C F , And a control module 430. Where N is a positive integer greater than 0, and N is 1 in this embodiment.

[0036] Such as Figure 4A As shown, the first group of adjusting capacitor modules 402 includes capacitors C1 and C2 connected to the first end; the second group of adjusting capacitor modules 404 includes capacitors C3 and C4 connected to the ...

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Abstract

A programmable gain amplifier includes an operational amplifier, N attenuation capacitors, N+1 sets of adjustment capacitor modules, multiple switching switches, a switching control module, and a feedback switch, where N is an integer greater than 0. Each group of adjustment capacitor modules has at least one adjustment capacitor. Each switching switch is controlled by the switching control module, and its switch common end is respectively connected to the second end of the adjustment capacitor, so as to connect the connected adjustment capacitor to an input signal, a reference voltage, or the output end of the operational amplifier. The feedback switch is connected between the output end of the operational amplifier and the first input end, is turned on during a first phase period, and is turned off during other periods. The adjustment capacitor can be connected to the output terminal of the operational amplifier as a feedback capacitor through the control of the switching switch in a second phase, and the first phase and the second phase do not overlap.

Description

Technical field [0001] The present invention provides a gain amplifier, in particular a programmable gain amplifier with attenuation capacitors and a sampling capacitor that can be switched to a feedback capacitor. Background technique [0002] figure 1 It is a schematic diagram of an amplifier 100 in the form of a known switched capacitor. Such as figure 1 As shown, the amplifier 100 includes a sampling capacitor Cs and a feedback capacitor C F , Two switches S1, S2, and an operational amplifier 110. The operation of the amplifier 100 is as follows: in a first phase (sampling phase), the switch S1 is connected to the input signal Vin, and the switch S2 is turned on. Therefore, the sampling capacitor Cs charges and samples the input signal Vin during the first phase. In a second phase (amplification phase), the switch S1 will be connected to the ground potential, and the switch S1 will be opened to form an open circuit. At this time, the charge stored in the sampling capacitor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/18
Inventor 欧阳铭林盟智
Owner SUNPLUS TECH CO LTD
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