Apparatus and method for providing differential-to-single ended conversion and impedance transformation
First Claim
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1. A circuit for providing differential-to-single ended conversion and impedance transformation from first and second differential signals comprising:
- a first impedance connected between the first differential signal and an output node; and
a second impedance connected between the second differential signal and the output node, wherein the first and second impedances are comprised of reactive elements, and wherein the first impedance has an inductive reactance and the second impedance has a capacitive reactance.
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Abstract
A method and apparatus is provided for use in power amplifiers for reducing the peak voltage that transistors are subjected to. A power amplifier is provided with first and second switching devices and an inductor connected between the switching devices. The switching devices are driven such that the switching devices are turned on and off during the same time intervals.
105 Citations
26 Claims
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1. A circuit for providing differential-to-single ended conversion and impedance transformation from first and second differential signals comprising:
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a first impedance connected between the first differential signal and an output node; and
a second impedance connected between the second differential signal and the output node, wherein the first and second impedances are comprised of reactive elements, and wherein the first impedance has an inductive reactance and the second impedance has a capacitive reactance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit for providing differential-to-single ended conversion and impedance transformation from a plurality of differential input pairs, each differential input pair comprising first and second signals, the circuit comprising:
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a first impedance having an inductive reactance connected between the first signal of each differential signal pair and an output node; and
a second impedance having a capacitive reactance connected between the second signal of each differential signal pair and the output node; and
wherein the first and second impedances are comprised of reactive elements. - View Dependent Claims (11, 12)
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13. A method of converting differential signals to a single ended output comprising the steps of:
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shifting the current from a first differential signal voltage by −
90 degrees;
shifting the current from a second differential signal voltage by +90 degrees; and
summing the currents from the first and second differential signals in phase to provide the single ended output. - View Dependent Claims (14, 15, 16)
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17. A circuit for providing differential-to-single ended conversion and impedance transformation from first and second differential signals comprising:
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a first impedance coupled between the first differential signal and an output node;
a second impedance coupled between the second differential signal and the output node, wherein the first and second impedances are comprised of reactive elements, and wherein the first impedance has an inductive reactance and the second impedance has a capacitive reactance; and
a series connected capacitor and inductor coupled between the output node and a load to AC-couple the output node from one or more of the differential signals and to filter the signal passed to the load. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A differential-to-single ended conversion circuit comprising:
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a first input node connectable to a first differential signal;
a second input node connectable to a second differential signal;
an output node for providing a single ended output;
a first impedance connected to the first input node and to the output node;
a second impedance connected to the second input node and to the output node; and
wherein the first impedance has an inductive reactance and the second impedance has a capacitive reactance. - View Dependent Claims (26)
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Specification