GPS receiver with reflection amplifiers
First Claim
1. A GPS receiver, comprising:
- an antenna configured to receive an input signal;
a first amplifier configured to amplify the input signal, wherein the amplifier includes a terminal that presents a negative resistance to the input signal and thereby reflectively amplifies the input signal;
a splitter configured to receive the amplified input signal and split the signal into a plurality of split signals;
second amplifiers configured to selectively amplify or attenuate the plurality of split signals, each second amplifier including a first terminal that presents a negative resistance to at least one of the plurality of split signals and a second terminal that receives a control signal that controls the reflective amplification or attenuation of the respective split signal; and
processing circuitry configured to demodulate the amplified or attenuated split signals and calculate positional data.
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Accused Products
Abstract
An AM receiver incorporates an antenna, a transistor, a current source, and a power supply. The antenna is connected to a gate electrode of the transistor and through a link to a signal earth. In operation, the antenna receives radiation and generates a corresponding input signal which propagates to the gate electrode. The transistor is operable to process the input signal in two steps, namely to reflectively amplify the input signal to generate a correspondingly reflectively amplified input signal at the gate electrode in a first step, and amplitude demodulate the amplified input signal in a second step. The transistor is operable in a non-linear region of its current/voltage characteristic whereas it simultaneously provides reflective amplification and signal demodulation, namely the two steps occur simultaneously. In contradistinction, conventional demodulators employing gain devices operating non-linearly to provide amplitude demodulation incorporate the devices configured to function as transmission amplifiers.
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Citations
24 Claims
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1. A GPS receiver, comprising:
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an antenna configured to receive an input signal; a first amplifier configured to amplify the input signal, wherein the amplifier includes a terminal that presents a negative resistance to the input signal and thereby reflectively amplifies the input signal; a splitter configured to receive the amplified input signal and split the signal into a plurality of split signals; second amplifiers configured to selectively amplify or attenuate the plurality of split signals, each second amplifier including a first terminal that presents a negative resistance to at least one of the plurality of split signals and a second terminal that receives a control signal that controls the reflective amplification or attenuation of the respective split signal; and processing circuitry configured to demodulate the amplified or attenuated split signals and calculate positional data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for processing a signal that is usable in determining a positional reference, comprising:
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receiving an input signal from a source of known position; splitting the input signal into a plurality of split signals; for each split signal, reflectively amplifying or attenuating the split signal with an amplifier that presents a negative resistance to the split signal, wherein the reflective amplification or attenuation of the split signal is controlled by a control signal, and demodulating the amplified or attenuated split signals; and processing the demodulated signals in a measurement unit to calculate positional data. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification