LC Oscillator Magnetic Sensitive Biosensor Based on Switched Capacitor In Situ Self-Calibration Technology
A technology of switched capacitors and oscillators, applied in the field of biosensors, can solve the problems of increasing the cost and complexity of sensor chips, limiting mass production applications, etc., achieving layout and wiring and timing control optimization, and improving design reliability and robustness , The effect of improving the detection sensitivity
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[0017] In order to make the object, technical solution and features of the present invention clearer, specific implementation methods will be described in detail below in conjunction with the accompanying drawings.
[0018] The present invention proposes an LC oscillator magnetosensitive biosensor based on the in-situ self-calibration technology of on-chip switched capacitors. The on-chip LC oscillator is used as a detection module, and the change of the output frequency is detected by the change of the inductance caused by the magnetic particles. The sensor composed as figure 1 As shown, including: n LC oscillator sensing units on CMOS chip, n switched capacitors for in-situ self-calibration of LC oscillator, power management module (LDO), buffer, encoder / decoder, frequency mixer device, low-pass filter, and off-chip frequency counter; wherein, n switched capacitors and n LC oscillator sensing units form a sensor microarray (n is 20 in this embodiment), and each LC oscillator...
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