Ultra wideband transmitter with gated push-pull RF amplifier
First Claim
1. A UWB transmitter that includes a gated push-pull amplifier to generate a UWB transmission having reduced spurious outputs, said transmitter comprising:
- a signal splitter that divides a low-level UWB input signal into first and second signals of substantially opposite phase relationship, respective first and second amplifier segments of said push-pull amplifier that amplify the first and second signals to produce amplified output signals having a substantially opposite phase relative to each other;
a switch responsive to a gate signal to activate the amplifiers prior to receiving the first and second signals; and
a combiner that combines the amplified output signals of substantially opposite phase relationship whereby to provide a UWB signal transmission having reduced in-phase spurious output signals associated with activating said amplifiers.
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Accused Products
Abstract
A method and an apparatus that reduce power consumption in an ultra wideband (UWB) transmitter that includes a push-pull RF amplifier and a switch that powers up or powers down the amplifier between UWB pulses. The gated push-pull amplifier amplifies the UWB pulses, including spurious signal energy appearing at the detector input, by splitting the signal with a 180-degree phase splitter, amplifying the split signals with substantially identical amplifiers, and combining the amplifier outputs with a 180-degree combiner. The 180-degree combiner essentially cancels common-mode spurious signals typically generated by the UWB amplifier during power-down and power-up.
51 Citations
17 Claims
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1. A UWB transmitter that includes a gated push-pull amplifier to generate a UWB transmission having reduced spurious outputs, said transmitter comprising:
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a signal splitter that divides a low-level UWB input signal into first and second signals of substantially opposite phase relationship, respective first and second amplifier segments of said push-pull amplifier that amplify the first and second signals to produce amplified output signals having a substantially opposite phase relative to each other;
a switch responsive to a gate signal to activate the amplifiers prior to receiving the first and second signals; and
a combiner that combines the amplified output signals of substantially opposite phase relationship whereby to provide a UWB signal transmission having reduced in-phase spurious output signals associated with activating said amplifiers. - View Dependent Claims (2, 3, 4, 5, 6)
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7. In a UWB system, a push-pull amplifier comprising:
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a signal splitter that receives signal energy at an input thereof and partitions the signal energy into first and second signals of substantially opposite phase relationship;
respective amplifier segments that amplify the first and second signals to produce first and second amplified signals;
a switch responsive to a gate signal to activate the amplifiers before the amplifier receives the first and second signals; and
a signal combiner that combines the first and second amplified signals whereby to provide a composite output signal having reduced spurious signal output. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An ultra wideband radio frequency transmitter comprising:
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an amplifier;
a UWB source that provides a short-pulse radio frequency signal in response to a trigger signal;
a timing circuit that controls activation of the amplifier during a UWB pulse generation interval to reduce inter-pulse power consumption outside of the interval;
a first transformer for delivering signal energy at said output along first and second paths to create signals substantially opposite in phase;
respective amplifiers disposed in said first and second paths; and
a second transformer that combines signals in the first and second path signals to provide a composite output signal, whereby to provide cancellation of spurious signal energy. - View Dependent Claims (14, 15)
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16. A method of reducing spurious signal outputs in a UWB system that generates a UWB pulse during a time interval defined by switching events, the method comprising:
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splitting UWB signal energy into signals of opposite phase, push-pull amplifying the signals during switching events thereby to produce amplified signals, and combining the amplified signals, whereby to reduce said spurious signal outputs.
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17. A method of reducing spurious signal outputs in a UWB system that detects a UWB pulse during a time interval defined by switching events, the method comprising:
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splitting signal energy into signals of opposite phase, push-pull amplifying the signals during switching events thereby to produce amplified signals, and combining the amplified signals, whereby to reduce said spurious energy.
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Specification