A Compact Measurement Technique for Detector Capacitance of Charge Amplifiers

Song, Yong Won; Kinnison, Whitney; Rozsa, Jace; Austin, Daniel E.; Hawkins, Aaron R.; Chiang, Shiuh–hua Wood

doi:10.1109/iscas45731.2020.9181160

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…In contrast, the output voltage of the charge amplifier is proportional to the amount of input charge, and the SNR is high. This is also a challenge for this design [12].…”

Section: Simulation Results Of the Voltage Amplifier For Ecg Equipmen...mentioning

confidence: 99%

A Double- electrodes Amplifier use for Portable ECG Equipment

Zhu¹

2023

HSET

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Wearable electrocardiogram (ECG) sensors is a simple test that can be used to check people’s heart's rhythm and electrical activity. With individuals’ increasing attention to their own health, developing a timely and portable bio-sensing recorder has become an urgent task. This paper presents the working principle of a common ECG signal recorder. A double-electrode voltage amplifier that can be used for portable ECG sensors has been set out to design. The amplifier is mainly composed of a differential amplifier circuit, which can lower power supply and power consumption. CoolSpice environment was utilized to simulate the circuit and analyze the result. The simulation presented that the common-mode gain is under 30dB up to 5KHz and the differential-mode gain is larger than 40 dB up to 5KHz. And the total current consumption has been under 20uA. The result demonstrated that the amplifier can perform well. The noise from human body has been eliminated by the amplifier. The amplifier has the ability to extract and amplify clean ECG signals and its structure has the characteristics of low cost and portability. It may be used in portable wearable ECG sensor technology.

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“…In contrast, the output voltage of the charge amplifier is proportional to the amount of input charge, and the SNR is high. This is also a challenge for this design [12].…”

Section: Simulation Results Of the Voltage Amplifier For Ecg Equipmen...mentioning

confidence: 99%

A Double- electrodes Amplifier use for Portable ECG Equipment

Zhu¹

2023

HSET

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“…To demonstrate 450 the effectiveness of the proposed amplifier to tolerate parasitic 451 input capacitance, we measure the amplifier closed-loop gain 452 for different input capacitances. Similar to [10], the input 453 capacitance is set by an explicit discrete capacitor of a known 454 value verified by a high-precision parameter analyzer. Fig.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…But the electrode geometry is highly application-specific [8] and the total input capacitance of the charge amplifier is a function of both the electrode geometry and electrode connections. Therefore, the amplifier must have a high open-loop gain to maintain a consistent closed-loop gain for precise charge measurement [10]. While CMOS circuits are attractive for their low cost and amenability for large-scale integration, their low-intrinsic gain is problematic in charge amplifier applications where a high open-loop gain (>100 dB) is desired.…”

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confidence: 99%

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The Digital-Assisted Charge Amplifier: A Digital-Based Approach to Charge Amplification

Song

Smith

Karlinsey

et al. 2022

IEEE Trans. Circuits Syst. I

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A charge amplifier incorporates digital circuits as 1 an alternative to the classic analog amplifier to achieve a high 2 open-loop gain to maintain a consistent closed-loop gain over 3 input capacitance variations. The digital-assisted charge amplifier 4 employs a comparator, digital control logic, differential charge 5 pump, current sources, common-mode feedback, and clock gen-6 erator. A detailed analysis studies the amplifier stability and 7 trade-off between ripple voltage and settling speed. A novel two-8 step reset scheme and tri-state charge pump minimize the output 9 offset due to ripple residues. Fabricated in a 180-nm CMOS 10 process, the digital-assisted amplifier achieves an open-loop gain 11 of 101 dB, closed-loop gain of 15.0 µV/e-, input-referred noise of 12 221 erms, and output swing of 3 V while consuming 2.19 mW. 13 The amplifier also demonstrates the ability to amplify a dynamic 14 input current using a custom opto-electronic test setup. The 15 amplifier maintains a consistent closed-loop gain across parasitic 16

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