Patent ID: 6765438
Filing Date: 2004-07-20
Classification: H03F

Abstract:
A transconductance power amplifier for amplifying a signal to a capacitive load, comprising:only two N-channel MOSFET transistors, including; a first N-channel enhancement MOSFET transistor operatively arranged to source current to said capacitive load, wherein said first N-channel MOSFET transistor has a threshold gate to source voltage; a second N-channel enhancement MOSFET transistor operatively arranged to sink current to said capacitive load, said amplifier further comprising; an operational amplifier arranged to transmit and amplify an input signal to both of said first and second MOSFET transistors; and, means for biasing said first N-channel enhancement MOSFET transistor such that its gate to source voltage is always at or above its threshold when the load draws near zero current so that very little additional gate charge is required to turn it on more fully.