Impedance transformer for amplifier and amplifier including the same
First Claim
Patent Images
1. An amplifier, comprising:
- an input terminal adapted to receive an input signal to be amplified;
an output terminal adapted to output an amplified output signal;
first, second, third, and fourth gain elements each having an input port and an output port;
an input power splitter coupled to the input terminal of the amplifier and adapted to split the input power and apply the split input signal to the input ports of the first through fourth gain elements;
an output resistor chain comprising three resistors extending between and connecting the output ports of the first through fourth gain elements; and
an output power combiner coupled to the output ports of the four gain elements and adapted to combine output signals from the four gain elements and provide the amplified output signal to the output terminal of the amplifier,wherein the output power combiner comprises,a first capacitor connected between a first combiner node and a fixed voltage,a second capacitor connected between a second combiner node and the fixed voltage,a first inductor connected between the output port of the first gain element and the first combiner node,a second inductor connected between the output port of the second gain element and the first combiner node,a third inductor connected between the output port of the third gain element and a second combiner node,a fourth inductor connected between the output port of the fourth gain element and the second combiner node, andan output stage coupling the first and second combiner nodes to the output port of the amplifier,wherein at least two of the first, second, third, and fourth inductors have substantially different inductance values from each other.
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Abstract
An amplifier has an input port, an output port, N gain elements in parallel, an input power splitter coupled between the input port of the amplifier and the input ports of the N gain elements, an output resistor chain extending between the output ports of the first through Nth gain elements, and an output power combiner coupled between the output ports of the N gain elements and the output port of the amplifier. The output power combiner presents a corresponding input impedance to each of the N gain elements. At least two of the input impedances presented by the output power combiner to the N gain elements are substantially different from each other.
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Citations
18 Claims
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1. An amplifier, comprising:
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an input terminal adapted to receive an input signal to be amplified; an output terminal adapted to output an amplified output signal; first, second, third, and fourth gain elements each having an input port and an output port; an input power splitter coupled to the input terminal of the amplifier and adapted to split the input power and apply the split input signal to the input ports of the first through fourth gain elements; an output resistor chain comprising three resistors extending between and connecting the output ports of the first through fourth gain elements; and an output power combiner coupled to the output ports of the four gain elements and adapted to combine output signals from the four gain elements and provide the amplified output signal to the output terminal of the amplifier, wherein the output power combiner comprises, a first capacitor connected between a first combiner node and a fixed voltage, a second capacitor connected between a second combiner node and the fixed voltage, a first inductor connected between the output port of the first gain element and the first combiner node, a second inductor connected between the output port of the second gain element and the first combiner node, a third inductor connected between the output port of the third gain element and a second combiner node, a fourth inductor connected between the output port of the fourth gain element and the second combiner node, and an output stage coupling the first and second combiner nodes to the output port of the amplifier, wherein at least two of the first, second, third, and fourth inductors have substantially different inductance values from each other. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An amplifier, comprising:
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an input terminal adapted to receive an input signal to be amplified; an output terminal adapted to output an amplified output signal; first, second, third, and fourth gain elements each having an input port and an output port; an input power splitter coupled to the input terminal of the amplifier and adapted to split the input power and apply the split input signal to the input ports of the four gain elements; an output resistor chain comprising three resistors extending between and connecting the output ports of the first through fourth gain elements; and an output power combiner coupled to the output ports of the four gain elements and adapted to combine output signals from the four gain elements and provide the amplified output signal to the output terminal of the amplifier, wherein the output power combiner comprises, a first capacitor connected between a first combiner node and a fixed voltage, a second capacitor connected between a second combiner node and the fixed voltage, a first inductor connected between the output port of the first gain element and the first combiner node, a second inductor connected between the output port of the second gain element and the first combiner node, a third inductor connected between the output port of the third gain element and a second combiner node, a fourth inductor connected between the output port of the fourth gain element and the second combiner node, a fifth inductor connected between the output port of the first gain element and the fixed voltage, a sixth inductor connected between the output port of the second gain element and the fixed voltage, a seventh inductor connected between the output port of the third gain element and the fixed voltage, an eighth inductor connected between the output port of the fourth gain element and the fixed voltage, and an output stage coupling the first and second combiner nodes to the output terminal of the amplifier, wherein the first, second, third, and fourth inductors have substantially the same inductance values as each other, and wherein at least two of the fifth, sixth, seventh, and eighth inductors have substantially different inductance values from each other. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An amplifier, comprising:
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an input terminal adapted to receive an input signal to be amplified; an output terminal adapted to output an amplified output signal; first through Nth gain elements each having an input port and an output port; an input power splitter coupled to the input terminal of the amplifier and adapted to split the input power and apply the split input signal to the input ports of the first through Nth gain elements; an output resistor chain comprising N−
1 resistors extending between and connecting the output ports of the first through Nth gain elements; andan output power combiner coupled to the output ports of the N gain elements and adapted to combine output signals from the N gain elements and provide the amplified output signal to the output terminal of the amplifier, wherein the output power combiner presents a corresponding input impedance to each of the N gain elements, and wherein at least two of the input impedances presented by the output power combiner to the N gain elements are substantially different from each other. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification