Very high frequency passive transponder, in UHF frequency band, with active voltage multiplier or booster at the entry of its logic circuit
First Claim
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1. Passive transponder arranged for receiving a very high frequency electromagnetic signal in the UHF range, the passive transponder including:
- (A) an antenna; and
(B) an integrated circuit connected to said antenna, said integrated circuit includingi. analogue means for rectifying alternating input voltage of said received electromagnetic signal and for multiplying or boosting said alternating input voltage, wherein said rectifying and multiplying means powers a logic circuit of said integrated circuit, wherein said alternating input voltage rectifying and multiplying means includesa. a passive rectifier supplying a rectified voltage; and
b. an active voltage multiplier or booster arranged downstream of the passive rectifier, said voltage multiplier or booster including at least one capacitor switched to a lower frequency than said frequency of said received signal.
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Abstract
The passive transponder comprises an antenna (2) connected to an integrated circuit (6) the analogue part of which includes a passive voltage rectifier (8) supplying a rectified voltage (VDC1) and an active multiplier or booster (16) for said rectified voltage which is formed by a capacitor (C2) switched to a relatively low frequency, for example 1 MHz, by means of switches formed by transistors (18 to 21) controlled using an oscillator (24).
19 Citations
5 Claims
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1. Passive transponder arranged for receiving a very high frequency electromagnetic signal in the UHF range, the passive transponder including:
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(A) an antenna; and (B) an integrated circuit connected to said antenna, said integrated circuit including i. analogue means for rectifying alternating input voltage of said received electromagnetic signal and for multiplying or boosting said alternating input voltage, wherein said rectifying and multiplying means powers a logic circuit of said integrated circuit, wherein said alternating input voltage rectifying and multiplying means includes a. a passive rectifier supplying a rectified voltage; and b. an active voltage multiplier or booster arranged downstream of the passive rectifier, said voltage multiplier or booster including at least one capacitor switched to a lower frequency than said frequency of said received signal. - View Dependent Claims (2, 3, 4, 5)
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Specification