Abstract: A parallel phase shift circuit is configured to perform a phase shift process in parallel on an input signal pair including a first I signal orthogonal to a first Q signal, in accordance with a phase difference among a set of n multi-phase separation frequency signal pairs including a set of second I signals orthogonal to a set of second Q signals, to generate a set of n phase-shifted orthogonal signal pairs including a set of third I signals orthogonal to a set of third Q signals; and a phase discrete continuous measurement circuit configured to, based on the n phase-shifted orthogonal signal pairs from the parallel phase shift circuit, generate a set of discrete signals being n discrete values and generate a set of continuous tangent signals being a set of a desired number of signals interpolating the set of discrete signals.

Abstract: A parallel phase shift circuit is configured to perform a phase shift process in parallel on an input signal pair including a first I signal orthogonal to a first Q signal, in accordance with a phase difference among a set of n multi-phase separation frequency signal pairs including a set of second I signals orthogonal to a set of second Q signals, to generate a set of n phase-shifted orthogonal signal pairs including a set of third I signals orthogonal to a set of third Q signals; and a phase discrete continuous measurement circuit configured to, based on the n phase-shifted orthogonal signal pairs from the parallel phase shift circuit, generate a set of discrete signals being n discrete values and generate a set of continuous tangent signals being a set of a desired number of signals interpolating the set of discrete signals.

Abstract: The present invention comprises: a reference-signal generation circuit 5 that performs a reference-signal generation process on a first input signal and outputs a resulting first reference signal and a resulting second reference signal proportional to the first input signal; a coefficient-signal synthesis circuit 6 that performs a coefficient-signal synthesis process on the first reference signal and a second input signal containing at least a frequency component contained in the first input signal, and outputs a resulting coefficient signal; a transfer-signal production circuit 7 that performs a desired frequency-selection control process on the second reference signal and outputs a resulting transfer signal; and a transfer-signal synthesis circuit 9 that performs a transfer-signal synthesis process on the coefficient signal and the transfer signal and outputs a resulting signal to an output terminal.

Abstract: An immittance conversion circuit includes a first terminal and a second terminal, and includes: a conversion target circuit configured to amplify or attenuate a signal with desired frequency and gain characteristics, and output the resultant signal; a difference signal detection circuit configured to supply the input terminal of the conversion target circuit with a signal of a difference between signals generated at the first and second terminals; an immittance conversion drive circuit configured to perform differential output processing to generate a voltage of a difference between a correction voltage and the signal outputted from the conversion target circuit, and output feedback signals to an immittance conversion generation circuit; and the immittance conversion generation circuit having an immittance conversion generation action to generate, at each of the first and second terminals, a signal of currents or voltages of the corresponding inputted feedback signal and the signal inputted to the first or se

Abstract: An immittance conversion circuit includes a first terminal and a second terminal, and includes: a conversion target circuit configured to amplify or attenuate a signal with desired frequency and gain characteristics, and output the resultant signal; a difference signal detection circuit configured to supply the input terminal of the conversion target circuit with a signal of a difference between signals generated at the first and second terminals; an immittance conversion drive circuit configured to perform differential output processing to generate a voltage of a difference between a correction voltage and the signal outputted from the conversion target circuit, and output feedback signals to an immittance conversion generation circuit; and the immittance conversion generation circuit having an immittance conversion generation action to generate, at each of the first and second terminals, a signal of currents or voltages of the corresponding inputted feedback signal and the signal inputted to the first or se

Abstract: A complex resonant circuit includes: a first current path performing a first gain control to an AC power signal being supplied; at least one second current path performing a second gain control different from the first gain control to the AC power signal; at least two resonant circuits provided on the respective first and second current paths, having mutually different resonance or antiresonance points for the AC power signals passing through the respective first and second current paths and capturing the respective AC power signals; at least one compensation current path performing a compensation phase shift to the AC power signal; a compensation circuit, provided on the compensation current path, for removing an unnecessary component of the resonant circuit; and an analog operational circuit performing analog addition or subtraction on the AC power signal having passed through the first and second current paths, and the compensation current path.

Abstract: A complex resonance circuit includes a first current path performing a first phase shift and a first gain control to an AC power signal supplied, at least one second current path performing a second phase shift different in amount from the first phase shift and a second gain control different in amount from the first gain control to the AC power signal, at least two resonant circuits which are provided each on the respective first and second current paths, and have mutually different resonance points or antiresonance points for the AC power signals each passing through the respective first and second current paths and capture the respective AC power signals, and an analog operational circuit for allowing the AC power signals having passed through the first and second current paths to be subjected to addition or subtraction in an analog fashion for output.

Abstract: A composite resonance circuit is provided of which the resonance frequency is variable over a wide frequency range without changing the circuit constant of a non-resonant element having no resonance frequency. The composite resonance circuit comprises an input terminal; a resonance unit having first and second ports and quasi-resonating in response to AC signals respectively supplied to these ports; and phase shift circuits that perform different phase shifts on an AC signal supplied to the input terminal and supply first and second shifted signals subjected to the phase shift respectively to the first and second ports. The resonance unit is an impedance circuit that has at least four input terminals forming the first and second ports and that generates a quasi-resonant peak current under non-zero reactance in response to the first and second shifted signals coming in via the first and second ports.

Abstract: It is an object to provide a complex negative feedback frequency selection output circuit that can produce an output signal of a high resonance sharpness Q factor and an oscillation circuit using the same. The complex negative feedback frequency selection output circuit according to the present invention, frequency-selectively relays only the residual components of one of a signal in phase with (or a signal opposite in phase to) a feedback processed signal obtained by negative feeding back a feedback signal to an input frequency signal, with a rejected frequency band being left out, while relaying at least a real number component of the other, and comprises a feedback path which relays a difference signal between (or a sum signal of) the selectively relayed output and the relayed output of the real number component, as the feedback signal. The gain of a loop including this feedback path is variable and can be set manually or automatically.

Abstract: A serial resonance circuit is prepared. The serial resonance circuit is configured of a pair of resonance circuit is configured of a pair of resonance elements serially connected to each other at a midpoint therebetween and exhibiting resonance frequencies equal to each other. To both ends of the serial resonance circuit, phase shift circuits that shift phases so that the phases are reverse to each other are connected. A resonance output obtained from the serial resonance circuit when AC power is supplied between the midpoint and an input side of the phase shift circuit is obtained as an external output.

Abstract: A composite resonance circuit is provided of which the resonance frequency range can be set with greater degrees of freedom with the peak frequency of the resonance characteristic curve of a resonance unit having good linearity and the resonance sharpness Q-factor being kept within a desired range. In the composite resonance circuit according to the present invention, first and second relay circuits are respectively connected between the resonance unit and first and second phase shift circuits that shift an input frequency signal by different phases. Hence, the resonance frequency range can be set by setting the gains and impedances of the first and second relay circuits according to its use, without changing resonance elements or the like of the resonance unit.

Abstract: A composite resonance circuit is provided of which the resonance frequency is variable over a wide frequency range without changing the circuit constant of a non-resonant element having no resonance frequency. The composite resonance circuit comprises an input terminal; a resonance unit having first and second ports and quasi-resonating in response to AC signals respectively supplied to these ports; and phase shift circuits that perform different phase shifts on an AC signal supplied to the input terminal and supply first and second shifted signals subjected to the phase shift respectively to the first and second ports. The resonance unit is an impedance circuit that has at least four input terminals forming the first and second ports and that generates a quasi-resonant peak current under non-zero reactance in response to the first and second shifted signals coming in via the first and second ports.

Abstract: A piezoelectric vibration device includes a single piezoelectric substrate, at least three electrode pairs formed on the single piezoelectric substrate, and two external connection terminal pairs, wherein the three electrode pairs are connected to the two external connection terminal pairs so that two different vibration modes individually appear at the two external connection terminal pairs.

Abstract: There is provided a resonance circuit using piezoelectric vibrator such as a quartz resonator, a coil, a capacitor, or an element equivalent to them in combination. When two resonance circuits having different resonance frequencies are combined, it is possible to configure an oscillation circuit and a filter capable of freely adjusting the frequency characteristic by utilizing the phenomenon that by changing the excitation current or voltage of the respective resonance circuits independently from each other, antiresonance frequency of the entire composite resonance circuit can be changed.

Abstract: [Problem] To obtain a variable frequency source that produces high purity signals. [Constitution] A serial resonance circuit is prepared. The serial resonance circuit is configured of a pair of resonance elements serially connected to each other at a midpoint therebetween and exhibiting resonance frequencies equal to each other. To both ends of the serial resonance circuit, phase shift circuits that shift phases so that the phases are reverse to each other are connected. A resonance output obtained from the serial resonance circuit when AC power is supplied between the midpoint and an input side of the phase shift circuit is obtained as an external output.

Abstract: There is provided a resonance circuit using piezoelectric vibrator such as a quartz resonator, a coil, a capacitor, or an element equivalent to them in combination. When two resonance circuits having different resonance frequencies are combined, it is possible to configure an oscillation circuit and a filter capable of freely adjusting the frequency characteristic by utilizing the phenomenon that by changing the excitation current or voltage of the respective resonance circuits independently from each other, antiresonance frequency of the entire composite resonance circuit can be changed.

Abstract: A unit for suppressing harmonic vibration of a lower order which does not have desired frequency in an overtone resonator consisting main electrodes and sub electrodes. Harmonic vibration of a lower order suppressing piezoelectric vibrator comprises main electrodes arranged on a piezoelectric substrate and sub electrodes arranged in the vicinity of the main electrodes with gaps provided therebetween. If the electric equivalent circuit of the resonator is expressed by a coupling circuit which connects in series a circuit, which connects in parallel a series resonance circuit by the sub electrodes and coupling capacity indicating that the main electrodes are coupled with the sub electrodes, to a series resonance circuit by the main electrodes, then their loop frequencies substantially coincide with each other.

Abstract: A gas pressure sensor comprises a contour piezoelectric vibrator and the pressure of gas is detected by measuring an equivalent series resistance of the vibrator which is surrounded by the gas whose pressure is to be detected.