Doherty amplifier
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United States of America Patent
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Sep 21, 2010
Issued Date -
N/A
app pub date -
Apr 11, 2007
filing date -
Apr 14, 2006
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Abstract
An integrated Doherty amplifier structure comprises an input bond pad (IBP), and an output bond pad (OBP). A first transistor (T1) forms the peak amplifier stage of the Doherty amplifier and has a control input (G1) to receive a first input signal (IS1) being an input signal of the Doherty amplifier, and has an output (D1) to supply an amplified first input signal (OS1) at an output of the Doherty amplifier A second transistor (T2) forms a main amplifier stage of the Doherty amplifier and has a control input (G2) to receive a second input signal (IS2) and has an output (D2) to supply an amplified second input signal (0S2). The first input signal (IS1) and the second input signal (IS2) have a 90.degree. phase offset. A first bond wire (BW1) forms a first inductance (L1), and extends in a first direction, and is arranged between the input bond pad (IBP) and the control input (G1) of the first transistor (T1). A second bond wire (B W2) forms a second inductance (L2), and extends in the first direction, and is arranged between the output bond pad (OBP) and the output (D1) of the first transistor (T1). A third bond wire (B W3) forms a third inductance (L3) and extends in a second direction substantially perpendicular to the first direction, and is arranged between the output (D1) of the first transistor (T1) and the output (D2) of the second transistor (T2).
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