11results about "Angle demodulation" patented technology

In some examples, a method (300) includes receiving, at a first device, a radar signal transmitted by a second device at a transmit frequency offset from a local oscillator (LO) frequency offset of the first device by a target offset and reflected from a target (304). The method also includes determining an intermediate frequency (IF) of the radar signal based on the transmit frequency and the LO frequency (306). The method also includes determining a fraction per million (ppm) offset between the first device and the second device based on the intermediate frequency and the target offset.

The application discloses a signal demodulation circuit and a digital isolation circuit, wherein the signal demodulation circuit is arranged at a receiving end of the digital isolation circuit and comprises a common-gate amplification module, a demodulation module and a common-gate amplification module; the common-gate amplification module is used for receiving full-differential signals output by an isolation module in the digital isolation circuit and amplifying the full-differential signals; the demodulation module is connected with the common-gate amplification module and is used for demodulating the amplified full-differential signals and outputting the demodulated full-differential signals; and the common-gate amplification module comprises a first active load, a second active load, a first NMOS tube, a second NMOS tube, a first coupling capacitor, a second coupling capacitor, a first sampling resistor and a second sampling resistor. The circuit has high anti-interference capability.

An exemplary setup includes: a rectifier circuit arrangement comprising: a first resistor with one terminal; a second resistor with one terminal; a first transistor with a first terminal, a second terminal, and a control terminal; and a second transistor with a first terminal, a second terminal, and a control terminal;a reference circuit arrangement comprising a first input, a second input, a third input, a fourth input and an output, wherein the first input of the reference circuit arrangement is coupled to the control terminal of the first transistor, wherein the second input of the reference circuit arrangement is coupled to the terminal of the second resistor and the first terminal of the second transistor, wherein the third input of the reference circuit arrangement is coupled to the control terminal of the second transistor, and wherein the fourth input of the reference circuit arrangement is coupled to the terminal of the first resistor and the first terminal of the first transistor.

System for processing signals from a gyroscope (102), comprising: at least one drive channel (104) designed to receive an output from a drive axis (110) of the gyroscope (102), wherein the at least one drive channel (104) includes the following: a drive channel analog-to-digital converter (ADC) (112) which receives a drive signal from the drive channel (104) and outputs a digitized drive signal; a drive channel phase-correct demodulator (114) that receives the digitized drive signal and generates a phase-correct demodulated drive signal; at least one drive channel filter (118) that receives the phase-correct demodulated drive signal and outputs a filtered phase-correct demodulated drive signal; and a phase-locked loop (PLL); a detection channel (106) designed to receive an output from a detection axis (108) of the gyroscope (102), wherein the detection channel (106) includes the following: a capture channel ADW (124) that receives an analog rate signal from the capture channel (106) and outputs a digitized rate signal; and a digital signal processor (125) which includes the following: a detection channel phase-correct demodulator (126) that receives the digitized rate signal and generates a phase-correct demodulated rate signal; a capture channel quadrature-phase demodulator (128) that receives the digitized rate signal and generates a quadrature-phase demodulated rate signal; a first acquisition channel filter (130) that receives the phase-correct demodulated rate signal and outputs a filtered phase-correct demodulated rate signal; and a second acquisition channel filter (132) that receives the quadrature-phase demodulated rate signal and outputs a filtered quadrature-phase demodulated rate signal; and a digital subtraction circuit (134) that subtracts the filtered phase-correct demodulated drive signal from the filtered phase-correct demodulated rate signal to generate a sensing axis output signal.

The utility model provides a signal modulation and demodulation system of a digital isolator. The digital isolator and a pulse signal output end and a signal input end of a modulation module are respectively connected with a primary modulation node through a first switch; the first-stage modulation node is connected with the input end of the second-stage modulation node through the phase inverter; the RF signal output end is also connected with the input end of the secondary modulation node; the first switch is controlled by a level signal input by the signal input end to be switched on or switched off so as to control whether the pulse signal and the level signal can reach a primary modulation node for primary modulation or not, and a primary modulation signal is obtained; the secondary modulation node is controlled by the signal flowing out of the primary modulation node to be switched on or switched off so as to control whether the RF signal output by the RF signal output end and the signal flowing out of the primary modulation node can be subjected to secondary modulation or not, and a composite modulation signal is obtained. According to the utility model, two-stage precise modulation control is realized through the arrangement of the two-stage switch, so that the signal modulation precision of the digital isolator is remarkably improved.

Proposed are an LSK demodulator that can implement accurate recovery of a received signal, noise removal, clock synchronization by operating two signal processing means, each of which includes an integrator and a comparator, with a phase difference and a wireless power transmission / sensor information processing device including the LSK demodulator. The LSK demodulator includes an integrating receiver, a quadrature phase clock generator, a finite state machine, a phase interpolator, a duty cycle corrector, and a control circuit.

In some examples, a method (300) includes receiving, at a first device, a radar signal transmitted by a second device at a transmission frequency offset from a local oscillator (LO) frequency of the first device by a target offset and reflected off a target (304). The method also includes determining an intermediate frequency (IF) of the radar signal based on the transmission frequency and the LO frequency (306). The method also includes determining a parts per million (ppm) offset between the first device and the second device based on the intermediate frequency and the target offset

The utility model provides a signal modulation and demodulation system of a digital isolator. The digital isolator and a pulse signal output end and a signal input end of a modulation module are respectively connected with a primary modulation node through a first switch; the primary modulation node is connected with the secondary modulation node through the second switch; the RF signal output end is connected with the transmitting unit through the secondary modulation node; the first switch is controlled by a level signal input by the signal input end to be switched on or switched off so as to control whether the pulse signal and the level signal can reach a primary modulation node for primary modulation or not, and a primary modulation signal is obtained; the second switch is controlled by the signal of the primary modulation node to be switched on or switched off so as to control whether the RF signal and the primary modulation signal can reach the secondary modulation node for secondary modulation or not, and a composite modulation signal is obtained. According to the utility model, two-stage precise modulation control is realized through the arrangement of the two-stage switch, so that the signal modulation precision of the digital isolator is remarkably improved.

In some examples, a system includes a first oscillator to generate a first oscillator signal; and a receiver circuit to receive a first signal having a first frequency; generate an intermediate frequency signal based on the first signal and a second oscillator signal generated by a second oscillator; determine a frequency of the intermediate signal; and determine a variance between the first oscillator and the second oscillator based on a comparison of the frequency of the intermediate signal to an offset. The system may be DAR system having first and second radar sensors respectively associated with the first and second oscillators.