摘要:
A semiconductor integrated circuit includes a mixer circuit unit having a first single gate mixer configured to receive a first input signal having a first frequency and a second input signal having a second frequency as inputs, a second single gate mixer configured to receive the first input signal and a third input signal of a phase inverted from a phase of the second input signal as inputs, a third single gate mixer configured to receive a fourth input signal of a phase inverted from the phase of the first input signal and the second input signal as inputs, and a fourth single gate mixer configured to receive the third and the fourth input signals as inputs; and a 1/2-frequency divider unit configured to receive output signals from the first to the fourth single gate mixers as inputs and output a desired signal.
摘要:
A DC-DC converter has a switching element, a lowpass filter, an oscillator, an AD converter, an error signal generator, a counter, a comparator, a selector configured to select one of the plurality of clock signals in accordance with a value of a lower side bit of the error signal in sync with a timing when the comparator detects coincidence, and a switching controller configured to control ON/OFF of the switching element in accordance with the clock signal selected by the selector. The selector selects one among the plurality of clock signals and a new clock signal generated by combining two or more clock signals comprising neighboring phases among the plurality of clock signals.
摘要:
According to one embodiment, a semiconductor integrated circuit includes a phase shifter, a plurality of phase matching detecting circuits, a output module. The phase shifter is configured to delay an input oscillation signal to generate a plurality of delay signals having phases different from each other. The plurality of phase matching detecting circuits is configured to store a second program for downloading a first program from an outside to the first area. The output module is configured to generate an output oscillation signal based on at least one of the delay signals having the phase difference determined to be within the predetermined range.
摘要:
According to one embodiment, a semiconductor integrated device includes a digitally controlled oscillator, a counter, a time to digital converter, an adder, and a control signal generator. The time to digital converter includes a frequency-divider, a plurality of impedance elements, and a phase difference detector. The frequency-divider is configured to frequency-divide the oscillation signal to generate a plurality of frequency-divided signals. The plurality of impedance elements is configured to voltage-divide the frequency-divided signals to generate a plurality of delay signals of the oscillation signal. The phase difference detector is configured to output the third digital signal corresponding to the phase difference between the reference signal and the oscillation signal by comparing the reference signal with each of the delay signals.
摘要:
A frequency converting circuit that outputs an output signal obtained by mixing a first input signal and a second input signal, has: a first input terminal to which the first input signal is input; a second input terminal to which the second input signal is input; an output terminal from which the output signal is output; a frequency converting element that has a first input part connected to the first input terminal and an output part connected to the output terminal, restricts the signal input to the first input part according to a signal input to a second input part and outputs the restricted signal to the output part; and a pulse controlling circuit that receives the second input signal via the second input terminal and outputs a pulse signal obtained by restricting the pulses of the second input signal to the second input part of the frequency converting element.
摘要:
A semiconductor integrated circuit device includes: an amplifier circuit which respectively has one or more input terminals and one or more output terminals; a replica circuit which has the same DC characteristics as those of the amplifier circuit; a reference voltage generation circuit which is connected to a bias terminal of the replica circuit, and which generates a predetermined reference voltage at the bias terminal; and a feedback circuit which takes a difference between the reference voltage generated at the bias terminal of the replica circuit and the voltage generated at a bias terminal of the amplifier circuit, and which performs feedback control by providing negative feedback of the difference to the bias terminal of the amplifier circuit so that the voltage generated at the bias terminal of the amplifier circuit is made equal to the reference voltage generated at the bias terminal of the replica circuit.
摘要:
According to one embodiment, a semiconductor integrated device includes a digitally controlled oscillator, a counter, a time to digital converter, an adder, and a control signal generator. The time to digital converter includes a frequency-divider, a plurality of impedance elements, and a phase difference detector. The frequency-divider is configured to frequency-divide the oscillation signal to generate a plurality of frequency-divided signals. The plurality of impedance elements is configured to voltage-divide the frequency-divided signals to generate a plurality of delay signals of the oscillation signal. The phase difference detector is configured to output the third digital signal corresponding to the phase difference between the reference signal and the oscillation signal by comparing the reference signal with each of the delay signals.
摘要:
A semiconductor integrated circuit includes a mixer circuit unit having a first single gate mixer configured to receive a first input signal having a first frequency and a second input signal having a second frequency as inputs, a second single gate mixer configured to receive the first input signal and a third input signal of a phase inverted from a phase of the second input signal as inputs, a third single gate mixer configured to receive a fourth input signal of a phase inverted from the phase of the first input signal and the second input signal as inputs, and a fourth single gate mixer configured to receive the third and the fourth input signals as inputs; and a ½-frequency divider unit configured to receive output signals from the first to the fourth single gate mixers as inputs and output a desired signal.
摘要:
A wireless communication apparatus includes a local oscillator that generates a plurality of LO (Local Oschillation) signals corresponding to frequencies of a plurality of input RF (Radio Frequency) signals, an accumulator that accumulates the plurality of LO signals generated by the local oscillator to generate an accumulated signal, a mixer that mixes the plurality of RF signals and the accumulated signal generated by the accumulator and to generate a plurality of base band signals, and a first signal processing unit that executes a signal process with respect to the plurality of base band signals generated by the mixer.
摘要:
A wireless communication apparatus includes a local oscillator that generates a plurality of LO (Local Oschillation) signals corresponding to frequencies of a plurality of input RF (Radio Frequency) signals, an accumulator that accumulates the plurality of LO signals generated by the local oscillator to generate an accumulated signal, a mixer that mixes the plurality of RF signals and the accumulated signal generated by the accumulator and to generate a plurality of base band signals, and a first signal processing unit that executes a signal process with respect to the plurality of base band signals generated by the mixer.