SYSTEMS FOR ANALOG PHASE SHIFTING
First Claim
Patent Images
1. A system for phase shifting comprising:
- a first switch that couples a first switch input to a common rail only when the first switch is closed;
a first sub-circuit, comprising a first capacitor and a first inductor;
wherein the first inductor couples a signal input of the system to the first switch;
wherein the first capacitor couples the first switch input and the first inductor to the common rail;
wherein the first sub-circuit includes only a single inductor and a single capacitor;
a second switch that couples a second switch input to the common rail only when the second switch is closed;
a second sub-circuit, comprising a second capacitor and a second inductor;
wherein the second capacitor couples the signal input of the system to the second switch;
wherein the second inductor couples the second switch input and the second capacitor to the common rail;
wherein the second sub-circuit includes only a single inductor and a single capacitor; and
a third switch that couples a signal output of the system to the first sub-circuit when in a first switch state and couples the output of the system to the second sub-circuit when in a second switch state;
wherein the system phase shifts the signal output relative to the signal input.
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Abstract
A system for phase shifting that produces an output signal by modifying a phase of an input signal, including a primary phase shifting stage that modifies the input signal phase in increments set by a first tuning resolution; a secondary phase shifting stage that modifies the input signal phase in increments set by a second tuning resolution; and, a tuning circuit that controls the primary phase shifting stage and the secondary phase shifting stage according to control input.
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Citations
19 Claims
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1. A system for phase shifting comprising:
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a first switch that couples a first switch input to a common rail only when the first switch is closed; a first sub-circuit, comprising a first capacitor and a first inductor;
wherein the first inductor couples a signal input of the system to the first switch;
wherein the first capacitor couples the first switch input and the first inductor to the common rail;
wherein the first sub-circuit includes only a single inductor and a single capacitor;a second switch that couples a second switch input to the common rail only when the second switch is closed; a second sub-circuit, comprising a second capacitor and a second inductor;
wherein the second capacitor couples the signal input of the system to the second switch;
wherein the second inductor couples the second switch input and the second capacitor to the common rail;
wherein the second sub-circuit includes only a single inductor and a single capacitor; anda third switch that couples a signal output of the system to the first sub-circuit when in a first switch state and couples the output of the system to the second sub-circuit when in a second switch state; wherein the system phase shifts the signal output relative to the signal input. - View Dependent Claims (2, 3, 4)
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5. A system for phase shifting that produces an output signal by modifying a phase of an input signal, the system comprising:
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a primary phase shifting stage that modifies the input signal phase in increments set by a first tuning resolution; a secondary phase shifting stage that modifies the input signal phase in increments set by a second tuning resolution; and a tuning circuit that controls the primary phase shifting stage and the secondary phase shifting stage according to control input; wherein the second tuning resolution is higher than the first tuning resolution. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for self-interference cancellation comprising:
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a transmit coupler, communicatively coupled to an RF transmit signal of a wireless communication system, that samples the RF transmit signal to create a sampled RF transmit signal having a first RF carrier frequency; a frequency downconverter that converts the sampled RF transmit signal to an IF transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the first RF carrier frequency; an IF self-interference canceller that transforms the IF transmit signal to an IF self-interference cancellation signal; a frequency upconverter, comprising a first mixer, a first local oscillator, and a first phase shifter, that converts the IF self-interference cancellation signal to a phase-shifted IF-sourced RF self-interference cancellation signal by phase shifting a signal of the first local oscillator and mixing the phase shifted local oscillator signal with the IF self-interference cancellation signal; an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal; and a receive coupler, communicatively coupled to an RF receive signal of the wireless communication system, that combines the RF self-interference cancellation signal and the phase-shifted IF-sourced RF self-interference cancellation signal with the RF receive signal. - View Dependent Claims (16, 17, 18, 19)
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Specification