Telecommunications – Transmitter – Modulation by absorption – shielding – or reflecting
Reexamination Certificate
2006-05-15
2009-06-23
Jackson, Blane J (Department: 2618)
Telecommunications
Transmitter
Modulation by absorption, shielding, or reflecting
C455S041200, C342S044000, C375S308000, C375S312000, C375S315000
Reexamination Certificate
active
07551903
ABSTRACT:
A modulator circuit comprises a negative impedance amplifier which is operable such that a signal applied to the amplifier is reflected and amplified. Switching means are provided for switching the impedance of the amplifier between two reflecting states such that the reflected and amplified signal is phase modulated. The impedances of the negative impedance amplifier are selected such that the phase of the reflected and amplified signal in the first reflecting state differs substantially from the phase of the reflected and amplified signal in a second reflecting state. For example, the phase switches by substantially 180 degrees. Preferably the impedances of the negative impedance amplifier in the two reflecting states are selected such that the reflection gain of the amplifier in the two reflecting states is substantially the same such that the reflected and amplified signal is a binary phase shift keyed.
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Farr Adrian N
Forster Ian J
Christensen O'Connor Johnson & Kindness PLLC
Jackson Blane J
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