Abstract: A TWA measuring apparatus includes: an electrocardiograph controlling section which is configured to produce an electrocardiogram from electrocardiographic signals of a subject; and a TWA measuring section which is configured to select at least two waveforms that contribute to a measurement of TWA, from the electrocardiogram, and which is configured to measure a presence of TWA by using the selected at least two waveforms.

Abstract: A TWA measuring apparatus includes: an electrocardiograph controlling section which is configured to produce an electrocardiogram from electrocardiographic signals of a subject; and a TWA measuring section which is configured to select at least two waveforms that contribute to a measurement of TWA, from the electrocardiogram, and which is configured to measure a presence of TWA by using the selected at least two waveforms.

Abstract: The object of the present invention is to provide a crystal oscillator with one IC capable of effectively responding to specifications or a frequency of an installed set, an output terminal of the oscillator 1 is connected to an input terminal of the inverter 2, an output terminal of which is connected to the first resistor 7 and one terminal of the second resistor 8, the other terminal of the first resistor 7 is connected to one terminal of the first capacitor 9 and an input terminal of the first transistor 3, the other terminal of the first capacitor 9 is connected to one terminal of the first switch 11, and the other terminal of the first switch 11 is grounded, the other terminal of the second resistor 8 is connected to one terminal of the second capacitor 10 and an input terminal of the second transistor 4, the other terminal of the second capacitor 10 is connected to one terminal of the second switch 12, and the other terminal of the second switch 12 is grounded, an output terminal of the first transisto

Abstract: The output part of a power circuit with a temperature characteristic 31 is connected to the power voltage of a CMOS inverter-type oscillator circuit 4 including a crystal vibrator. The power circuit with a temperature characteristic 31 includes an amplifier 2, a diode 20 and a resistor 11. The output end V2 of the amplifier 2 is connected to the anode of the diode 20. The cathode of the diode 20 is connected to the negative input end V3 of the amplifier 2 and one end of the resistor 11, and the other end of the resistor 11 is grounded. To the positive input end V1 of the amplifier 2 is connected a voltage source 1 with small VCC variations.

Abstract: A voltage-controlled crystal oscillator having a voltage-variable capacitive element and a crystal vibrator, includes a control voltage generating circuit, a first charging circuit which charges an output-side capacitive component, a low pass filter having a first resistor and a first fixed capacitor, a timer circuit which outputs a control signal, a first switching element which is turned on in response to the control signal from the timer circuit so as to make both ends of the first resistor open-circuited, a second charging circuit to which a signal synchronized with the control signal is input, and a second fixed capacitor to which an output terminal of the second charging circuit is connected, and which connects a connection point between the first resistor and the first fixed capacitor. The low pass filter is arranged between the voltage-variable capacitive element and a connection point of the control voltage generating circuit and the first charging circuit.

Abstract: The object of the present invention is to provide a crystal oscillator with one IC capable of effectively responding to specifications or a frequency of an installed set, an output terminal of the oscillator 1 is connected to an input terminal of the inverter 2, an output terminal of which is connected to the first resistor 7 and one terminal of the second resistor 8, the other terminal of the first resistor 7 is connected to one terminal of the first capacitor 9 and an input terminal of the first transistor 3, the other terminal of the first capacitor 9 is connected to one terminal of the first switch 11, and the other terminal of the first switch 11 is grounded, the other terminal of the second resistor 8 is connected to one terminal of the second capacitor 10 and an input terminal of the second transistor 4, the other terminal of the second capacitor 10 is connected to one terminal of the second switch 12, and the other terminal of the second switch 12 is grounded, an output terminal of the first transisto