Proximity detection circuit and method of detecting...

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

Reexamination Certificate

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Details

C327S603000

Reexamination Certificate

active

07102366

ABSTRACT:
A proximity detection circuit. An oscillator circuit is adapted to provide charge to an antenna. An operational amplifier, operated as a unity gain follower, receives an antenna signal which is representative of an external capacitive load on the antenna. A detector circuit receives the antenna signal via the operational amplifier and outputs a detection signal in response to changes in the antenna signal. A comparator receives the detection signal and is adapted to generate an output signal in response thereto.

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