Electronic phase shifter
First Claim
1. A phase shifter for an input signal, comprising:
- a first resonator tuned to a frequency less than that of said input signal;
a second resonator tuned to a frequency higher than that of said input signal;
a weighting circuit for, responsive to a control signal, applying a magnitude adjusted form of said input signal to each of said first resonator and said second resonator;
a summing circuit for summing an output of said first resonator and an output of said second resonator to obtain a phase shifted output signal.
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Accused Products
Abstract
An electronic phase shifter splits an input signal into two signals whose amplitudes are set by a weighting circuit controlled by a phase shift control signal. Each of the two outputs of the weighting circuit is loaded with an RLC resonator, one tuned to a frequency lower than that of the input signal and one tuned to a frequency higher than that of the input signal. The loaded outputs are recombined in a vector summing network to synthesize the required phase shifted output signal. This technique permits implementation on a monolithic integrated circuit (MIC) with high gain at high frequencies (e.g. 10 GHz). It also allows a large dynamic range of operation and a large (i.e., greater than 90 degrees) controllable phase shift. This is accomplished without the use of variable reactance elements or any other components external to the MIC.
31 Citations
12 Claims
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1. A phase shifter for an input signal, comprising:
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a first resonator tuned to a frequency less than that of said input signal; a second resonator tuned to a frequency higher than that of said input signal; a weighting circuit for, responsive to a control signal, applying a magnitude adjusted form of said input signal to each of said first resonator and said second resonator; a summing circuit for summing an output of said first resonator and an output of said second resonator to obtain a phase shifted output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A phase shifter for an input signal, comprising:
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a first resonator tuned to a frequency less than that of said input signal; a second resonator tuned to a frequency higher than that of said input signal; a weighting circuit for, responsive to a control signal, weighting said input signal with a first weighting and applying said input signal weighted by said first weighting to a first output loaded with said first resonator and weighting said input signal with a second weighting and applying said input signal weighted by said second weighting to a second output loaded by said second resonator; a summing circuit for summing said first output and said second output to obtain a phase shifted output signal.
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12. A phase shifter for a high frequency input signal, comprising:
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a steering amplifier circuit for inputting with said high frequency input signal and with a phase shifting control signal; a first resonating circuit for resonating at a frequency less than that of said high frequency signal, said first resonating circuit loading a first output of said steering amplifier; a second resonating circuit for resonating at a frequency greater than that of said high frequency signal, said second resonating circuit loading a second output of said steering amplifier; a combining circuit coupled to said first steering amplifier output and said second steering amplifier output.
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Specification