Various embodiments relate to a free running oscillator, that includes a switch capacitor based frequency-to-voltage converter (F2V), a comparator, and a voltage controlled oscillator (VCO), which may be collectively configured to reduce amplifier offset and flicker noise while increasing effective gain of the amplifier of the comparator. The F2V may produce a feedback voltage Vfb corresponding to frequencies of output of the VCO. The comparator may be configured to sample a reference voltage Vref using a sampling capacitor, compare Vref to Vfb, and generate an output based on any difference between Vref and Vfb, where the output may be integrated using an integrating capacitor of the comparator. The comparator may compensate for parasitic capacitance at the output of the amplifier by using an amplifier having two outputs, with the sampling capacitor and integrating capacitor being coupled to respectively different outputs of the amplifier.

A clock-gating synchronization circuit is provided. The clock-gating synchronization circuit includes a synchronization circuit and clock-gating circuit. The synchronization circuit is configured to perform a synchronization operation to convert a first control signal in a first clock domain into a second control signal in a second clock domain, transmit the second control signal to an electronic circuit, and determine whether the first control signal and the second control signal are the same to generate a first signal. The clock-gating circuit is configured to perform clock gating on the clock signal from a clock generator in the second clock domain according to the first signal to generate a gated clock signal, and transmit the gated clock signal to the electronic circuit and the synchronization circuit, wherein the synchronization operation performed by the synchronization circuit is controlled by the gated clock signal.

A clock-gating synchronization circuit is provided. The clock-gating synchronization circuit includes a synchronization circuit and clock-gating circuit. The synchronization circuit is configured to perform a synchronization operation to convert a first control signal in a first clock domain into a second control signal in a second clock domain, transmit the second control signal to an electronic circuit, and determine whether the first control signal and the second control signal are the same to generate a first signal. The clock-gating circuit is configured to perform clock gating on the clock signal from a clock generator in the second clock domain according to the first signal to generate a gated clock signal, and transmit the gated clock signal to the electronic circuit and the synchronization circuit, wherein the synchronization operation performed by the synchronization circuit is controlled by the gated clock signal.

A radar system includes: a plurality of first receiving devices for generating a plurality of first digital signals according to a plurality of first incoming signals, respectively; and a plurality of second receiving devices for generating a plurality of second digital signals according to a plurality of second incoming signals, respectively. A processing device is arranged to perform a first beamforming operation to generate a plurality of first beamforming signals according to the plurality of first digital signals and a first gain matrix, and to perform a second beamforming operation to generate a plurality of second beamforming signals according to the plurality of second digital signals and a second gain matrix; and to determine an altitude angle of a first object and a second object, and to determine a first azimuth angle of the first object and a second azimuth angle of the second object.

A radar system includes: a processing device arranged to generate a plurality of phase shifting digital signals; a plurality of transmitting devices for generating an RF beam according to the plurality of phase shifting digital signals during a first mode; a plurality of first receiving devices for generating a plurality of first digital signals according to a plurality of first incoming signals, respectively, during a second mode; and a plurality of second receiving devices for generating a plurality of second digital signals according to a plurality of second incoming signals, respectively, during the second mode. The processing device is further arranged to distinguish a first object and a second object when the RF beam hits the first object and the second object, and the first object and the second object have a same radial speed and are located at a same range.

A method for multiphase frequency to voltage conversion includes generating for each cycle of an oscillating input, one of a plurality of non-overlapping clocks. A respective voltage in proportion to an input frequency of the oscillating input, is generated in response to each of the non-overlapping clocks, with a respective one of a plurality of frequency to voltage converters. Each of the respective voltages is summated to generate a voltage sum proportional to the input frequency.

A semiconductor IC device comprises a timing circuit to transfer a timing signal, the timing circuit being configured to receive a first test signal and to effect a delay in the timing signal in response to the first test signal, the first test signal including a first timing event. The semiconductor IC device further comprises an interface circuit configured to transfer the data signal in response to the timing signal, the interface circuit being further configured to receive a second test signal and to effect a delay in the data signal in response to the second test signal, the second test signal including a second timing event that is related to the first timing event according to a test criterion.

A semiconductor IC device comprises a timing circuit to transfer a timing signal, the timing circuit being configured to receive a first test signal and to effect a delay in the timing signal in response to the first test signal, the first test signal including a first timing event. The semiconductor IC device further comprises an interface circuit configured to transfer the data signal in response to the timing signal, the interface circuit being further configured to receive a second test signal and to effect a delay in the data signal in response to the second test signal, the second test signal including a second timing event that is related to the first timing event according to a test criterion.

The invention relates to a resonator circuit, the resonator circuit comprising a transformer comprising a primary winding and a secondary winding, wherein the primary winding is inductively coupled with the secondary winding, a primary capacitor being connected to the primary winding, the primary capacitor and the primary winding forming a primary circuit, and a secondary capacitor being connected to the secondary winding, the secondary capacitor and the secondary winding forming a secondary circuit, wherein the resonator circuit has a common mode resonance frequency at an excitation of the primary circuit in a common mode, wherein the resonator circuit has a differential mode resonance frequency at an excitation of the primary circuit in a differential mode, and wherein the common mode resonance frequency is different from the differential mode resonance frequency.

The invention relates to a resonator circuit, the resonator circuit comprising a transformer comprising a primary winding and a secondary winding, wherein the primary winding is inductively coupled with the secondary winding, a primary capacitor being connected to the primary winding, the primary capacitor and the primary winding forming a primary circuit, and a secondary capacitor being connected to the secondary winding, the secondary capacitor and the secondary winding forming a secondary circuit, wherein the resonator circuit has a common mode resonance frequency at an excitation of the primary circuit in a common mode, wherein the resonator circuit has a differential mode resonance frequency at an excitation of the primary circuit in a differential mode, and wherein the common mode resonance frequency is different from the differential mode resonance frequency.