Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2005-07-26
2005-07-26
Nguyen, Patricia (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S20700P, C330S251000
Reexamination Certificate
active
06922101
ABSTRACT:
An amplifier comprises a transformer comprising a primary coil and a secondary coil having a center tap on the secondary coil connected to a reference point. A constant periodic signal generator is connected to the primary coil. A signal reception and amplification circuit comprises a first switch connected between a first end of the secondary coil and an output node; and a second switch connected between a second end of the secondary coil and the output node, such that a first voltage at the first switch is substantially inverse to a second voltage at the second switch; a phase shift modulator operative to convert the input signal to a phase shift modulated input signal connected to a control input of the first switch such that the first switch turns on and off in response to changes in the phase shift modulated input signal; an inverter control operatively connected to the control input of each switch, and operative to turn the second switch off when the first switch is turned on, and vice versa; and a filter connected to the output node.
REFERENCES:
patent: 4992751 (1991-02-01), Attwood et al.
patent: 5075634 (1991-12-01), French
patent: 6026126 (2000-02-01), Gaetano
patent: 6392476 (2002-05-01), Rodriguez
patent: 6496059 (2002-12-01), Nguyen
Law Offices of Albert Wai-Kit Chan LLC
Nguyen Patricia
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