Abstract:
A resonance inductor of a resonant circuit is formed of a chip inductor and an inductance fine adjustment pattern. A resonance capacitor is formed of a plurality of chip layered capacitors connected in parallel to each other via connection patterns formed on a substrate. The connection patterns are sequentially disconnected to adjust the capacitance of the resonance capacitor. Then, the inductance fine adjustment pattern is partially removed to adjust the inductance of the resonance inductor.
Abstract:
A low frequency sinusoidal oscillator, comprises a circuit which contains operational amplifiers, resistors and capacitors and has no inductor. The circuit, however, operates as an inductor. The circuit is arranged to resonate at a frequency which may be chosen by acting on only one component which preferably is a resistive component.
Abstract:
An arrangement for generating signals for selection, in particular for use in telephone subscribers sets. The device comprises a switchable RC- oscillator which is composed of an amplifier with negative feedback and a frequency-dependent voltage divider for positive feedback which comprises resistors, capacitors and switches. The frequency-dependent voltage divider has a configuration such that, if one switch is closed, the attenuation is smaller than the amplification of the amplifier and, if two switches are closed, the attenuation is larger than the amplification.
Abstract:
A quadrature oscillator is provided with a device which senses the output of the oscillator and compares it with a precision reference voltage to thereby obtain a signal which is used as the supply voltage provided to the integrating stages of the oscillator. By so controlling the supply voltage, the output of the oscillator is automatically amplitude stabilized and distortion is reduced.
Abstract:
공진회로(1)의 공진용 인덕터(L1)가 칩 인덕터(L1a')와 인덕턴스 미세조정용 패턴(LP)에 의해서 구성되며, 공진용 콘덴서(C2)가 각각 기판상에 형성된 접속용 패턴(CP1-CP5)을 거쳐서 서로 병렬 접속된 복수의 칩 적층 콘덴서(Ca'-Ce')에 의해 구성되며, 접속용 패턴(CP1-CP5)이 차례로 절단되어서 공진용 콘덴서(C2)의 캐패시턴스 값이 조정되며, 그후, 인덕턴스 미세조정용 패턴(LP)이 부분적으로 제거되어서 공진용 인덕터(L1)의 인덕턴스 값이 조정된다.