Modulation compensated clamp circuit

Details Modulation compensated clamp circuit Modulation compensated clamp circuit

1997-10-06

1998-09-29

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361111, 361113, 361 91, H02H 900

Patent

active

058153551

ABSTRACT:
A radio frequency identification (RFID) tag includes a tank circuit for receiving a power signal transmitted on a radio frequency (RF) carrier by a remote interrogator unit. Information is conveyed from the tag to the interrogator by varying a resistive load placed across the tank circuit as a function of data read from memory. Corresponding variations in the reflected signals are then detected by the interrogator. An overvoltage circuit cooperates with a modulation circuit for providing transmission of data even during an overvoltage condition, thus avoiding masking of the signal under such conditions.

REFERENCES:
patent: 4333072 (1982-06-01), Beigel
patent: 5041826 (1991-08-01), Milheiser
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5479172 (1995-12-01), Smith et al.

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