Abstract: A breathing meditation inducing device combined with headphones capable of measuring EEG, including a main body mounted on the user's face, and a control box electrically coupled to the main body and providing a driving signal to the main body is provided where the main body includes first and second opening and closing means for opening and closing the nostril of the user's nose, first and second driving means for driving the first and second opening and closing means, respectively, and mounting means for mounting the main body on the face In the headphone and breathing meditation inducing device capable of EEG measurement, characterized in that the control box is further provided with a memory card holder for inserting a memory card, the headphone installation part has an inner surface.

Abstract: Circuitry for controlling the oscillation frequency of an oscillator by using a digitally tunable on-chip capacitor bank. The capacitor bank includes a plurality of on-chip capacitors, each of which is independently selectable by a control signal for providing a selectable amount of capacitance to the oscillator to control the oscillator's oscillation frequency.

Abstract: A circuit for producing a reliable duty cycle for a low power oscillator. The circuit produces a square wave signal based on the differences between the oscillating output signal driven by a piezoelectric crystal and a phase shifted output signal. This circuit provides a quick start for a clock signal, generates a reliable fifty percent duty cycle and is better protected from common mode noise. This circuit can also be configured to be programmable to provide for an adjustable duty cycle.

Abstract: A clock oscillator circuit that includes an inverting amplifier and a resonator configured to generate an oscillating signal. The clock oscillator includes a bias circuit having a relatively constant current source configured to create a bias voltage to bias the amplifier in an operating state that can sustain the oscillating signal. The inverting amplifier and the bias circuit are configured to operate in a low power state.

Abstract: A circuit for producing a reliable duty cycle for a low power oscillator. The circuit produces a square wave signal based on the differences between the oscillating output signal driven by a piezoelectric crystal and a phase shifted output signal. This circuit provides a quick start for a clock signal, generates a reliable fifty percent duty cycle and is better protected from common mode noise. This circuit can also be configured to be programmable to provide for an adjustable duty cycle.

Abstract: Circuitry for controlling the oscillation frequency of an oscillator by using a digitally tunable on-chip capacitor bank. The capacitor bank includes a plurality of on-chip capacitors, each of which is independently selectable by a control signal for providing a selectable amount of capacitance to the oscillator to control the oscillator's oscillation frequency.

Abstract: Circuitry for controlling the oscillation frequency of an oscillator by using a digitally tunable on-chip capacitor bank. The capacitor bank includes a plurality of on-chip capacitors, each of which is independently selectable by a control signal for providing a selectable amount of capacitance to the oscillator to control the oscillator's oscillation frequency.

Abstract: An oscillator circuit including an integrated circuit amplifier, an integrated circuit active resistance circuit to set the gain of the amplifier, a crystal resonator to set the frequency of the signal generated by the oscillator circuit, and a pair of capacitors respectively situated at the inputs and outputs of the amplifier to assist in the starting of the oscillation signal. The active resistance circuit is responsive to an input signal in order to set the gain of the amplifier slightly above unity gain in order to meet the criterion for oscillation, but not too much above unity gain where the oscillator would unduly consume too much power. Thus, the oscillator has inherent low power characteristics. The active resistance circuit allows the amplifier gain to be set by software or other electronic means.

Abstract: A clock oscillator circuit that includes an inverting amplifier and a resonator configured to generate an oscillating signal. The clock oscillator includes a bias circuit having a relatively constant current source configured to create a bias voltage to bias the amplifier in an operating state that can sustain the oscillating signal. The inverting amplifier and the bias circuit are configured to operate in a low power state.

Abstract: Circuitry for controlling the oscillation frequency of an oscillator by using a digitally tunable on-chip capacitor bank. The capacitor bank includes a plurality of on-chip capacitors, each of which is independently selectable by a control signal for providing a selectable amount of capacitance to the oscillator to control the oscillator's oscillation frequency.

Abstract: An oscillator circuit including an integrated circuit amplifier, an integrated circuit active resistance circuit to set the gain of the amplifier, a crystal resonator to set the frequency of the signal generated by the oscillator circuit, and a pair of capacitors respectively situated at the inputs and outputs of the amplifier to assist in the starting of the oscillation signal. The active resistance circuit is responsive to an input signal in order to set the gain of the amplifier slightly above unity gain in order to meet the criterion for oscillation, but not too much above unity gain where the oscillator would unduly consume too much power. Thus, the oscillator has inherent low power characteristics. The active resistance circuit allows the amplifier gain to be set by software or other electronic means.