Device for controlling discharge of a charge capacitor in a transponder
First Claim
1. A transponder device, comprising:
- a charge capacitor operable to store voltage in response to an interrogation signal;
a transponder analog and digital circuit operable to transmit a data telegram in response to a discharge of said voltage stored in said charge capacitor; and
a discharge circuit operable to prevent said charge capacitor from discharging prior to said voltage reaching a threshold voltage level.
1 Assignment
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Accused Products
Abstract
A transponder device (10) includes a discharge circuit (18) to control the discharge of voltage from a charge capacitor (14). The discharge circuit (18) prevents transmission of a data telegram by the transponder device (10) until a voltage of the charge capacitor (14) reaches a threshold voltage level. The threshold voltage level is sufficient to ensure that a complete transmission of the data telegram is performed. Upon reaching the threshold voltage level, a transponder analog and digital circuit (19) initiates transmission of the data telegram. A control logic circuit (32) activates a counter (36) upon the start of the data telegram transmission. The counter (36) generates a control signal that is used to bypass the discharge circuit in order that the charge capacitor (14) can be connected directly to the transponder analog and digital circuit (19). In this manner, sufficient voltage is available at the beginning and end of the data telegram transmission in order to avoid deterioration of the data telegram transmission signal.
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Citations
17 Claims
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1. A transponder device, comprising:
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a charge capacitor operable to store voltage in response to an interrogation signal; a transponder analog and digital circuit operable to transmit a data telegram in response to a discharge of said voltage stored in said charge capacitor; and a discharge circuit operable to prevent said charge capacitor from discharging prior to said voltage reaching a threshold voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for controlling discharge of a charge capacitor in a transponder, comprising:
a discharge circuit operable to prevent the charge capacitor from discharging prior to a voltage of the charge capacitor reaching a threshold voltage level, said threshold voltage level being associated with an operating voltage level for the transponder. - View Dependent Claims (12, 13, 14, 15, 16, 17)
Specification