A New Discrete Analog Circuit Solution for Capacitive Rotary Encoders
Küçük Resim Yok
Tarih
2022
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IEEE-Inst Electrical Electronics Engineers Inc
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In the time of global chip crisis, it is clear that alternative electronic solutions are necessary; particularly for capacitive rotary encoders, or similar capacitive sensors where demodulation techniques are extensively used. In this work, a discrete analog switch based circuit solution is proposed for the capacitive rotary encoders for the first time in the literature to the best of our knowledge. A 3-layer uniquely designed capacitive encoder prototype is used as a capacitive sensor. The analog switch with OPAMP based demodulation configuration designed for this work is both cheaper and it works at higher frequencies than the analog multiplier configuration. Also, unlike ASIC, it does not require high-tech for production. With the established test setup; noise, smallest perceptible capacitance, nonlinearity and temperature analyses of the circuit were made and competing resultswere achieved. The noise levels in terms of degree and voltage are measured as 0.0063 degrees and 36.62 mu V root Hz; respectively. Minimum measurable capacitance achieved with the discrete analog circuit is 2.54 aF root Hz. Nonlinearity was found to be 0.29% which is highly correlated with the mechanical misalignments of the capacitive encoder. Although this particular study is carried out on capacitive encoders, the proposed circuit solution can be used for similar types of sensors.
Açıklama
Anahtar Kelimeler
Capacitive Sensor, Discrete Analog Switch Demodulation, Amplitude Modulation
Kaynak
Ieee Sensors Journal
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
22
Sayı
15
