30 results about "Phase oscillator" patented technology

A transmitter includes a first amplifier to amplify an in-phase oscillator signal to produce an in-phase mixing signal and a second amplifier to amplify a quadrature-phase oscillator signal to produce a quadrature-phase mixing signal. A first mixer mixes the in-phase mixing signal with a first information signal to produce a first output signal. A second mixer mixes the quadrature-phase mixing signal with a second information signal to produce a second output signal. The first output signal and an inverted second output signal are summed to produce a transmitter output signal that includes an image signal caused by a phase imbalance between the in-phase and quadrature-phase mixing signals. An image monitor monitors the image signal and reduces or eliminates the phase imbalance by independently adjusting a phase of the in-phase mixing signal and / or a phase of the quadrature-phase mixing signal. Consequently, a power of the image signal is reduced or eliminated.

A quadrature phase oscillator in a Radio Frequency (RF) transceiver Integrated Circuit (IC) is provided. The quadrature phase oscillator includes a voltage controlled oscillator and a filter. The voltage controlled oscillator provides an oscillating frequency for modulation of a transmission / reception signal according to an applied voltage. The filter receives the oscillating frequency from the voltage controlled oscillator as an input, passes one of a negative frequency component of the input oscillating frequency and a positive frequency component of the input oscillating frequency, attenuates the other frequency component, generates an I (In phase) signal that is in phase with the input oscillating frequency and a Q (Quadrature phase) signal having a phase difference of 90 DEG with the input oscillating frequency for the passed frequency component, and outputs the I signal and the Q signal.

The invention relates to a multi-phase oscillator for generating multiple phase-shifted oscillator signals including: a ring oscillator having a number of concatenated oscillator delay cells which are interconnected to generate an oscillator signal, wherein phase-shifted oscillator signals are generated between the oscillator delay cells; a phase-blending unit configured to receive two phase-shifted oscillator signals and to generate a mid-phase oscillator signal whose phase shift is between the shifts of the two phase-shifted oscillator signals; and an interpolator delay line having a number of concatenated interpolator delay cells to generate further phase-shifted oscillator signals.

The invention discloses a difference frequency coupling damping control method for a transmission line, which mainly changes the original configuration of the traditional three-phase transmission linewith the same tension, the same sag, and the parallel running direction to a transmission line damping configuration with three-phase pay-off tension differences. The tension differences cause frequency differences of three-phase spring oscillators, and damping control on the whole system is realized through frequency difference match and coupling of inter-phase oscillators. In comparison with the original configuration, the sag change amplitude of the transmission line damping configuration is controlled in a moderate range, and safe operation of the line and the overall coordination and beauty of the line type are thus ensured. Through adjusting the pay-off tension of the three-phase transmission line, the large-span flexible structure vibration control problem is well solved.

The present invention provides a quick start-up circuit and a quick start-up method. The fast start-up circuit includes: a multi-phase oscillator, a control circuit, a phase selection circuit, a driving circuit and a crystal oscillator circuit; wherein, the multi-phase oscillator is used to generate a plurality of clocks with different phases; the control circuit is used to generate the initial injection signal and The cycle injection signal is used to control the opening and closing of the driving circuit; the phase selection circuit is connected to the multi-phase oscillator and the control circuit, and is used to select the appropriate phase clock from multiple clocks of different phases according to the cycle injection signal, and pass the driving circuit. Drive the crystal oscillator circuit with the selected clock. In this application, an appropriate phase can be selected for injection to achieve a stable injection effect and start-up speed, which greatly reduces the requirements for the injection clock accuracy; and the same circuit can be applied to crystal oscillators of different frequencies, which not only increases the reliability of the circuit , it also avoids the requirement for the oscillator start-up time and reduces the difficulty of circuit design.