A multi-channel current multiplexing chopper amplifier and chip
A chopper amplifier and current multiplexing technology, applied in amplifiers, DC-coupled DC amplifiers, differential amplifiers, etc., can solve problems such as occupied area and power consumption, increased system complexity, and increased number of current recombination branches
Active Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
Although this orthogonal current multiplexing structure can effectively reduce the overall power consumption of the system without affecting its noise performance, it requires an additional current recombination circuit, which increases the complexity of the system and takes up additional area and power consumption; As the number of stacked layers increases, the number of current recombination branches increases exponentially
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[0044]The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0045] refer to figure 1 , a multi-channel current multiplexed chopper amplifier comprising multiple amplifier units such as figure 1 As shown, a first amplifier unit CH1, a second amplifier unit CH2, a third amplifier unit CH3 and a fourth amplifier unit CH4 are included.
[0046] refer to figure 2 , the amplifier unit includes:
[0047] The differential input terminal is used to connect the differential voltage signal to the chopper amplifier; taking the first amplifier unit CH1 as an example, the differential voltage signal input from the differential input terminal is V i1- , V i1+ ; The output signal is V out1- , V out1+ .
[0048] The first chopping switch X1 is used for modulating the differential voltage signal input from the differential input end to a chopping frequency.
[0049] Input Stage Amplifier Circuit g m1 , used to a...
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The invention discloses a multi-channel current multiplexing chopper amplifier, which includes a plurality of amplifier units; the amplifier unit includes sequentially connected differential input terminals, a first chopping switch, an input-stage amplifying circuit, a second chopping switch and An output stage amplifying circuit, and a feedback loop for feeding back a signal of the output stage amplifying circuit to the input stage amplifying circuit, the feedback loop includes a feedback chopping switch and a feedback capacitor; at the first chopping switch and the input stage amplifying circuit An input capacitor is provided between them; an isolation capacitor is provided between the input stage amplifying circuit and the second chopper switch, and a bias resistor is provided at the input end of the output stage amplifying circuit; the input stages of the adjacent two amplifier units The amplifying circuits are stacked and connected, and all amplifier units share one current source. The input stage amplifying circuit of the present invention shares one current source, which simplifies the complexity of the circuit and reduces the area and power consumption of the integrated circuit. The invention can be widely used in the field of integrated circuits.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to a multi-channel current multiplexing chopper amplifier and a chip. Background technique [0002] The acquisition of low-frequency weak signals, especially the acquisition of biomedical signals, usually has specific requirements for the front-end amplifier circuit. In the low frequency band, the flicker noise is more significant, so it is usually necessary to chop the signal to be amplified to filter out the low frequency noise. In addition, for the implantable multi-channel biomedical signal acquisition system, the front-end amplifier circuit is also required to have the characteristics of low power consumption and small area. [0003] In the prior art, the orthogonal current multiplexing technology is a way to realize multi-channel weak signal acquisition with low power consumption. In this technology, the differential pair of the input stage amplifier circuit adopts a binar...
Claims
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IPC IPC(8): H03F1/34H03F3/45
CPCH03F1/342H03F3/45376
Inventor 吴朝晖郑骏翔李斌
Owner SOUTH CHINA UNIV OF TECH