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Minh dang trong qua trinh thiet ke mot mach khuech dai tin hieu cho cam bien ap suat (pressure sensor) voi dau ra la tin hieu analog rat nho (thang đo mili-volt). Minh dang gap van de lon ve nhieu tin hieu (noise) khien ket qua do bi sai lech nhieu so voi thuc te. Minh da thu mot so cach nhu them tu loc (bypass capacitor) tai chan nguon va su dung op-amp co do suy giam tin hieu chung (CMRR) cao, nhung ket qua van chua duoc nhu mong doi. Minh co vai thac mac muon nho cac cao nhan tai day tu van: Trong viec thiet ke PCB, viec bo tri mat dat (ground plane) co anh huong nhu the nao den viec giam nhieu cho cac tin hieu nho nay? Minh nen chia tach ground analog va digital nhu the nao cho hieu qua nhat? Cac ban co thuong su dung bo loc thong thap (low-pass filter) chu dong hay bi dong truoc khi dua vao ADC? Tinh toan tan so cat (cutoff frequency) nhu the nao de vua loai bo duoc nhieu nhung van giu duoc toc do phan hoi cua cam bien? Neu minh dung them shielding (che chan) cho duong day tin hieu, lieu co cach nao de giam thieu dien dung ky sinh (parasitic capacitance) gay ra hay khong? Minh rat mong nhan duoc su gop y ve phuong phap debug hoac cac cau truc mach tham khao. Neu ai co kinh nghiem trong viec thiet ke cac mach Analog Front-End (AFE) nhay cam, mong duoc cac ban chia se them. Rat cam on moi nguoi da danh thoi gian doc bai va hy vong som nhan duoc phan hoi cua cac ban. Moi ban ghe tham trang web cua chung toi de cap nhat tinh hinh thoi tiet nhanh chong, chinh xac va bien moi ngay tro nen thuan loi hon, bat chap moi bien dong cua thoi tiet. Su chu dong cua ban chinh la chia khoa cho mot cuoc song tien nghi va an toan. https://thoitiethomnay.org/ |
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