30 results about "Phase oscillator" patented technology

A transmitter and a signal amplifier are provided. The signal amplifier includes a digital-to-analog converter converting an input digital signal into an analog signal, a local oscillator signal generator outputting in-phase and quadrature-phase oscillator signals, a first mixer mixing the analog signal with the in-phase local oscillator signal to output an in-phase high frequency signal, a second mixer mixing the analog signal with the quadrature-phase local oscillator signal to output a quadrature-phase high frequency signal, a main amplifier amplifying the in-phase high frequency signal output from the first mixer, and an auxiliary amplifier amplifying the quadrature-phase high frequency signal output from the second mixer.

The invention discloses an implementation method for the rapid great pitch angle change motion of a pectoral fin paddling type robotic fish, which includes the following steps: (Step 1) a rapid pitch kinematics model is created; (Step 2) a phase oscillator model with the characteristic of time and spatial asymmetry is created; (Step 3) a CPG (Central Pattern Generator) control network structure is created; (Step 4) a rapid pitch motion control system is created. The implementation method adopts multi-drive coordinated pectoral fin and tail motion, the robotic fish can generate pitch moment far greater than moment generated by the deflection of a swimming bladder or a single tail fin by means of the kinetic characteristic of spatial and time asymmetry, consequently, the implementation method can realize the rapid pitch (pitch angle change is greater than 60 degrees) motion of the pectoral fin paddling type robotic fish, and the obstacle-crossing and obstacle-avoiding ability of the robotic fish facing vertical wall type obstacles underwater is greatly enhanced.

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 multiphase voltage controlled oscillator (e.g., a quadrature VCO) 100, which includes multiple voltage controllable transconductance phase drivers 102, 104, 106 and 108. The output of each voltage controllable transconductance phase driver 102, 104, 106, 108 supplies one of 4 oscillator phases and receives 2 of the 4 phases as inputs. Each of the voltage controllable transconductance phase drivers 102, 104, 106 and 108 corresponds to a pair of controllable transconductance inverting amplifiers 132, 134, 136, 138. The controllable transconductance inverting amplifiers may be a simple inverter 150 that includes N-type FET (NFET) 152 and P-type FET (PFET) 154. Transconductance is controlled in the simple inverter by raising or lowering supply voltage (Vdd) levels. A more complex controllable transconductance inverting amplifier may be used, replacing PFET 154 with series connected PFETs 164, 166. The gate of one PFET 166 is controlled by a bias control voltage VCON. For additional sensitivity and control PFETs 164, 166 may each be replaced with parallel pairs of PFETs 174, 176 and 178, 180. In addition to a quadrature VCO, an N phase oscillator may be formed with each phase generated by a controllable transconductance functional block, appropriately selecting block inputs from output phases.

The present invention relates to a technology applied to mobile communication, and more particularly to a circuit of extracting a synchronizing signal from a received signal for retransmitting the received signal in synchronization with the synchronizing signal in a repeater of a TDD system, etc. The circuit generates the synchronizing signal in a phase locked to a phase of the received signal and outputs the synchronizing signal through a signal extractor. A synchronizing signal extraction circuit according to example embodiments of the present invention includes a band pass filter 10 for passing a signal having a desired frequency, a signal detector 20 for detecting a synchronizing signal from an output of the band pass filter 10, a digital filter 30 for filtering an output of the signal detector to remove a noise, a digitally-programmed phase-locked loop (DPPLL) 40 for restoring the synchronizing signal from an output of the digital filter to lock a phase of an output of an oscillator, the oscillator 50 for generating an electrical oscillation of clock or pulse type, and a signal extractor 60 for outputting the synchronizing signal using the output of the oscillator. The present invention has wide applicability since the synchronizing signal is extracted from a signal of TDD type, has a relatively simple configuration and high performance since the DPPLL is used, can be manufactured compactly at relatively low cost since the small number of components are included, and may reduce problems such as heat generation due to lowered power consumption according to reduction of the number of components.

The invention discloses a method for realizing an M/N duty cycle clock signal based on monomolecular and bimolecular chemical reaction networks. The method comprises the following processes: if N is an even number, cyclically executing step 1: recording the transfer number of state species of N continuous 1/2 duty cycle clock signals, and when the N continuous 1/2 duty cycle clock signals are shifted from the species E0 to E1 for the N-Mth time and the Nth time, shifting the state of the M/N duty cycle clock signals, wherein E0 and E1 are the clock state species of the 1/2 duty cycle clock signals; and if N is an odd number, cyclically executing step 2: recording the transfer number of the state species of 2N continuous 1/2 duty cycle clock signals, and when the 2N continuous 1/2 duty cycle clock signals are shifted from the species E0 to E1 for the N-Mth time, the Nth time, the 2N-Mth time and the 2Nth time, shifting the state of the M/N duty cycle clock signals. The method disclosed by the invention only adopts monomolecular and bimolecular chemical reactions, does not need the aid of an N-phase oscillator, and is easy to implement.

In a wearable motion assist device, a motion assist device for generating a motion pattern synchronized with a wearer while maintaining a certain phase difference between a motion of the wearer and a motion of the device, and a synchronization based control method for the device are provided. The motion assist device acquires a phase of torque generated by the wearer's motion, applies a value of the phase to a phase oscillator model as an input, performs arithmetic processing, and calculates target torque and a target angle of the device with the motion of the device synchronized with the wearer. It is possible to improve an assisting effect of the device by controlling the device based on the calculated values.

The invention provides a rapid oscillation starting circuit and a rapid oscillation starting method. The rapid oscillation starting circuit comprises a multi-phase oscillator, a control circuit, a phase selection circuit, a drive circuit and a crystal oscillation circuit, wherein the multi-phase oscillator is used for generating a plurality of clocks with different phases; the control circuit is used for generating an initial injection signal and a periodic injection signal and controlling the opening and closing of the driving circuit; and the phase selection circuit is connected with the multi-phase oscillator and the control circuit, and is used for selecting a clock with a proper phase from a plurality of clocks with different phases according to the periodic injection signal, and driving the crystal oscillation circuit with the selected clock through the driving circuit. According to the invention, an appropriate phase can be selected for injection, a stable injection effect and oscillation starting speed are achieved, and the requirement on the precision of an injection clock is greatly reduced; moreover, the same circuit can be suitable for crystal oscillators with differentfrequencies, so the reliability of the circuit is improved, the requirement on the starting time of the oscillator is avoided, and the circuit design difficulty is reduced.

The invention discloses a frequency doubler which is used for processing a normal phase oscillator signal and an opposite phase oscillator signal for generating a signal of higher frequency on an output end. The frequency doubler comprises a first transistor, a second transistor, a first inductor and a second inductor, wherein the first end of the first transistor and the first end of the second transistor are on the same potential; the normal phase oscillator signal and the opposite phase oscillator signal are respectively input into the frequency doubler by the control end of the first transistor and the control end of the second transistor; the first inductor and the second inductor respectively couple the second end of the first transistor and the second end of the second transistor to the output end of the frequency doubler; and the first inductor and the second inductor can be realized by respectively independent inductance components and also can be realized by a symmetrical inductor with mutual inductance effect.

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° with the input oscillating frequency for the passed frequency component, and outputs the I signal and the Q signal.