Highly efficient constant transconductance power amplifier
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United States of America Patent
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Apr 27, 2004
Grant Date -
Nov 13, 2003
app pub date -
May 9, 2002
filing date -
May 9, 2002
priority date (Note) -
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Abstract
The present invention discloses a highly efficient constant transconductance power amplifier. an embodiment of the invention comprises a positive error amplifier, a negative error amplifier, four current sources, two differential current controllers, and a constant gm biasing circuit. The amplifiers are used with deliberate offset voltages in order to make two transconductance amplifiers which serve in the positive and negative cycle in order to turn on in the appropriate cycle properly. Positive current sources are current outputs while negative current sources sink the current. The current sources provide current to the current controllers. The differential current controllers control the amount of current from the current source flowing to the load. This is proportional to the differential input signal. The constant transconductance biasing circuit provides the transconductance amplifiers with stable biasing voltage. This eliminates any drift associated with process variation. The invention discloses a more efficient constant transconductance power amplifier which provides improved performance, low power consumption, lower operating voltage, increased dynamic range, and stable processing characteristics.
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