Abstract: An output switching circuit includes a switching circuit having a first transistor connected to a high-voltage power supply, a second transistor connected to a low-voltage power supply, and an output s terminal at a connection node between the first and second transistors; a comparison unit that compares an input signal with a feedback signal obtained by feedback of an output signal of the output terminal via a low-pass filter to generate a comparison signal; and a drive pulse generating unit that generates first drive pulses for driving the first transistor and second drive pulses for driving the second transistor in accordance with the comparison signal.

Abstract: An output switching circuit includes a switching circuit having a first transistor connected to a high-voltage power supply, a second transistor connected to a low-voltage power supply, and an output s terminal at a connection node between the first and second transistors; a comparison unit that compares an input signal with a feedback signal obtained by feedback of an output signal of the output terminal via a low-pass filter to generate a comparison signal; and a drive pulse generating unit that generates first drive pulses for driving the first transistor and second drive pulses for driving the second transistor in accordance with the comparison signal.

Abstract: An output switching circuit includes a switching circuit having a first transistor connected to a high-voltage power supply, a second transistor connected to a low-voltage power supply, and an output terminal at a connection node between the first and second transistors; a comparison unit that compares an input signal with a feedback signal obtained by feedback of an output signal of the output terminal via a low-pass filter to generate a comparison signal; and a drive pulse generating unit that generates first drive pulses for driving the first transistor and second drive pulses for driving the second transistor in accordance with the comparison signal.

Abstract: An output switching circuit includes a switching circuit having a first transistor connected to a high-voltage power supply, a second transistor connected to a low-voltage power supply, and an output terminal at a connection node between the first and second transistors; a comparison unit that compares an input signal with a feedback signal obtained by feedback of an output signal of the output terminal via a low-pass filter to generate a comparison signal; and a drive pulse generating unit that generates first drive pulses for driving the first transistor and second drive pulses for driving the second transistor in accordance with the comparison signal.

Abstract: A voltage controlled current source outputs oscillator drive current and oscillator equivalent current. A signal oscillator outputs first source oscillation signal and second source oscillation signal. A differential amplifier outputs first amplification oscillation signal and second amplification oscillation signal. First switch circuit and second switch circuit output first current oscillation signal and second current oscillation signal, respectively. A first current value converter-amplifier circuit converts a value of the first current oscillation signal whereas a second current value converter-amplifier circuit converts a value of the second current oscillation signal, so that the thus converted values become output current finally. An adder outputs to the differential amplifier a differential amplifier drive current in which equivalent current for use with conversion is added up with the oscillator equivalent current outputted from the voltage controlled current source.

Abstract: The distortion component of an oscillation signal is reduced. An oscillation signal generating circuit generates, as oscillation signals, first generation oscillation signal and second generation oscillation signal which are related to each other as a differential signal. A differential amplifier performs differential amplification on the first generation oscillation signal and the second generation oscillation signal, respectively, and outputs first amplification oscillation signal and second amplification oscillation signal. A converter circuit converts the first amplification oscillation signal and the second amplification oscillation signal into an output current oscillation signal of such a form that sink current and source current are alternately switched. In order to convert voltages of the first amplification oscillation signal and the second amplification oscillation signal into currents, a variable current source delivers a converting drive current to drive the converter circuit.

Abstract: A turn-round is provided in the middle of a plurality of differential amplifiers A1–A4. A first-stage differential amplifier A1 is provided in close proximity to a final-stage differential amplifier A4 so that distances between adjacent differential amplifiers are substantially equal to each other. With this, signal lines between the differential amplifiers are uniform in length and propagation delays are uniform. As a result, a high single-frequency oscillation signal is output.

Abstract: An amplifier for amplifying an input signal, having a plurality of amplifier stages each having a gain smaller than a target gain. The plurality of amplifier stages are connected in parallel and share the load of current amplification, and add output currents obtained from their respective amplifications to achieve the target gain as a whole.

Abstract: A voltage controlled current source outputs oscillator drive current and oscillator equivalent current. A signal oscillator outputs first source oscillation signal and second source oscillation signal. A differential amplifier outputs first amplification oscillation signal and second amplification oscillation signal. First switch circuit and second switch circuit output first current oscillation signal and second current oscillation signal, respectively. A first current value converter-amplifier circuit converts a value of the first current oscillation signal whereas a second current value converter-amplifier circuit converts a value of the second current oscillation signal, so that the thus converted values become output current finally. An adder outputs to the differential amplifier a differential amplifier drive current in which equivalent current for use with conversion is added up with the oscillator equivalent current outputted from the voltage controlled current source.

Abstract: A voltage controlled current source outputs oscillator drive current and oscillator equivalent current. A signal oscillator outputs first source oscillation signal and second source oscillation signal. An amplifier outputs first amplification oscillation signal and second amplification oscillation signal. First switch circuit and second switch circuit output first current oscillation signal and second current oscillation signal, respectively. A first current value converter-amplifier circuit converts a value of the first current oscillation signal whereas a second current value converter-amplifier circuit converts a value of the second current oscillation signal, so that the thus converted values become output current finally. An adder outputs to the amplifier an amplifier drive current in which equivalent current for use with conversion is added up with the oscillator equivalent current outputted from the voltage controlled current source.

Abstract: The distortion component of an oscillation signal is reduced. An oscillation signal generating circuit generates, as oscillation signals, first generation oscillation signal and second generation oscillation signal which are related to each other as a differential signal. A differential amplifier performs differential amplification on the first generation oscillation signal and the second generation oscillation signal, respectively, and outputs first amplification oscillation signal and second amplification oscillation signal. A converter circuit converts the first amplification oscillation signal and the second amplification oscillation signal into an output current oscillation signal of such a form that sink current and source current are alternately switched. In order to convert voltages of the first amplification oscillation signal and the second amplification oscillation signal into currents, a variable current source delivers a converting drive current to drive the converter circuit.

Abstract: An amplifier for amplifying an input signal, having a plurality of amplifier stages each having a gain smaller than a target gain. The plurality of amplifier stages are connected in parallel and share the load of current amplification, and add output currents obtained from their respective amplifications to achieve the target gain as a whole.

Abstract: A turn-round is provided in the middle of a plurality of differential amplifiers A1-A4. A first-stage differential amplifier A1 is provided in close proximity to a final-stage differential amplifier A4 so that distances between adjacent differential amplifiers are substantially equal to each other. With this, signal lines between the differential amplifiers are uniform in length and propagation delays are uniform. As a result, a high single-frequency oscillation signal is output.