Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-05-31
1993-11-30
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
34082554, G08B 1314
Patent
active
052669262
ABSTRACT:
A field coil signal transmission and tag power consumption measurement circuit for use in an inductive tag reader system. The circuit is coupled to an oscillator which provides a drive signal to a differential driver. The driver transforms the clock signal into first and second complementary drive signals. The drive signals are coupled to a field coil through a plurality of capacitors for inductively producing an output power signal. The capacitors are differentially coupled to the coil, so that each input of the coil is coupled to one of the clock signals through a separate capacitor. A bridge rectifier is coupled to the field coil opposite the capacitors for producing an output comprising a direct current (DC) element and an alternating current (AC) element superimposed on the DC element. A resistance-capacitance (R-C) filter, coupled to the bridge rectifier, provides a filtered rectifier output signal. The output signal can be decoded downstream of the R-C filter using several different decoding schemes known in the art.
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Avid Marketing, Inc.
Ng Jin F.
Oda Christine K.
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