Patent ID: 6922101

Claim:
An amplifier apparatus for amplifying an input signal, the apparatus comprising: 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 operatively connected to the primary coil; a signal reception and amplification circuit comprising: a first switch connected at a hot terminal thereof to a first end of the secondary coil and at a switched terminal thereof to an output node; a second switch connected at a hot terminal thereof to a second end of the secondary coil and at a switched terminal thereof to the output node, such that a first voltage at the hot terminal of the first switch is substantially inverse to a second voltage at the hot terminal of the second switch, with respect to the reference point; a phase shift modulator operative to convert the input signal to a phase shift modulated input signal with respect to the constant periodic signal, and wherein the phase shift modulated input signal is 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 operative to turn the second switch on when the first switch is turned off; and a filter connected to the reference point and operatively connected at an input end thereof to the output node, and at an output end thereof to an amplified signal output.