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CXA3621GE Datasheet(PDF) 9 Page - Sony Corporation |
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CXA3621GE Datasheet(HTML) 9 Page - Sony Corporation |
9 / 14 page – 9 – CXA3621GE Fig. 2 • Fingerprint sensor operation (Fig. 2) Description of characters Cs: Capacitance formed between the finger and the metal electrode Cp: Parasitic capacitance formed between the metal electrode and the silicon substrate Cp': Capacitance for canceling Cp (Cp ≈ Cp') Ch ∗: Hold capacitance Cf ∗: Feedback capacitance for determining the gain S ∗: Switch V ∗: Node voltage VM = VDD, VOS = VDD 1 2 4 11 Sr S4 S3 SVss Cf1 Cf2 Cs1 SS Ssig VM VDD SVDD SVDD Sense amplifier block (192: Sensor cell) (1: Dummy block) Sensor block (192 × 128: Sensor cell) (128: Dummy block) Upper: Sensor cell Lower: Dummy block Output block (1) S5 Sc Cs Cp Cp' Vcel Sensor Array Dummy Block Vsl S_Amp P_Amp VM Cf2 SD Sdmy P_Amp VM Ch1 Cf3 S6 S7 O_Amp VOS Ch2 Voi Voo Buffer Aout Vsns Sr S4 S3 SVss Cf1 VM VDD S5 Sd1 Cp Cp' Vceld Vsld S_Amp Ch1 Vsnsd |
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