Vectorial signal combiner for generating an amplitude modulated carrier by adding two phase modulated constant envelope carriers
First Claim
1. A combiner for combining first and second signals having the same frequency but a time varying relative phase shift, to generate a signal proportional to the sum or difference of said first and second signals, said combiner comprising:
- first and second inputs for receiving said first and second signals, respectively;
means for receiving a phase shift signal indicative of the value of said variable relative phase shift;
combining means, connected to said first and second inputs, for generating a signal related to the vectorial sum or difference of said first and second signals;
first and second reactive circuit elements, responsive to said phase shift signal, the reactance of each of said circuit elements being a function of said relative phase shift, said first reactive circuit element being connected to said first input and said second reactive circuit element being connected to said second input, wherein, for each value of said relative phase shift, the impedances of said first and second reactive circuit elements cause the current entering each of said first and second inputs to be in phase with the potential on each of said first and second inputs, respectively.
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Accused Products
Abstract
A circuit for combining first and second signals having the same frequency. The signals have a relative phase shift, 2a(t). The circuit generates a signal that is proportional to the sum or difference of signals. The circuit appears to be a resistive load; however, the circuit can be constructed from purely reactive circuit elements, and hence, does not dissipate energy. In one embodiment, the circuit is constructed from a transformer and two LC circuits in which the capacitance is varied in response to a(t). The circuit may be used to construct a high efficiency RF amplification stage.
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Citations
6 Claims
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1. A combiner for combining first and second signals having the same frequency but a time varying relative phase shift, to generate a signal proportional to the sum or difference of said first and second signals, said combiner comprising:
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first and second inputs for receiving said first and second signals, respectively; means for receiving a phase shift signal indicative of the value of said variable relative phase shift; combining means, connected to said first and second inputs, for generating a signal related to the vectorial sum or difference of said first and second signals; first and second reactive circuit elements, responsive to said phase shift signal, the reactance of each of said circuit elements being a function of said relative phase shift, said first reactive circuit element being connected to said first input and said second reactive circuit element being connected to said second input, wherein, for each value of said relative phase shift, the impedances of said first and second reactive circuit elements cause the current entering each of said first and second inputs to be in phase with the potential on each of said first and second inputs, respectively. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification