Binary high-power modulator
First Claim
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1. A circuit for signal modulation, the circuit comprising:
- a channel for carrying an analog RF signal;
a phase offset circuit configured to receive the analog RF signal on the channel, and configured to receive a phase code comprising a binary offset code for modifying the analog RF signal to produce a modified RF signal; and
a feedforward cancellation path coupled in parallel to the phase offset circuit for canceling a portion of the modified RF signal.
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Abstract
System and method for signal modulation. In one embodiment, a circuit includes a channel for carrying an analog RF signal, a phase offset circuit on the channel, and configured to receive a phase code for modifying the analog RF signal to produce a modified RF signal, and a feedforward cancellation path coupled in parallel to the phase offset circuit for canceling a portion of the modified analog signal.
23 Citations
19 Claims
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1. A circuit for signal modulation, the circuit comprising:
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a channel for carrying an analog RF signal; a phase offset circuit configured to receive the analog RF signal on the channel, and configured to receive a phase code comprising a binary offset code for modifying the analog RF signal to produce a modified RF signal; and a feedforward cancellation path coupled in parallel to the phase offset circuit for canceling a portion of the modified RF signal. - View Dependent Claims (2, 3, 4)
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5. An antenna system comprising:
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a first 180-degree hybrid on a transmit channel for receiving a first RF signal, and for receiving a phase code comprising a binary offset code for spreading the first RF signal from a reject band into a spread band to produce an encoded RF signal; an antenna for transmitting the encoded RF signal, and for receiving a second RF signal; and a second 180-degree hybrid on a receive channel for receiving the second RF signal, and for receiving the phase code for despreading the second RF signal from the spread band into the reject band to produce a decoded RF signal. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method of RF signal processing, the method comprising:
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receiving an RF signal at a phase offset circuit from an antenna; receiving a phase code comprising a binary offset code at the phase offset circuit; phase-shifting portions of the RF signal according to the phase code to generate a phase-shifted RF signal; and transmitting the phase-shifted RF signal, wherein the RF signal is encoded according to the phase code. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification