Abstract: The crystal oscillator for surface mounting includes: a container body having first and second recesses on both principal surfaces thereof; a crystal blank hermetically encapsulated within the first recess; and an IC chip in which an oscillation circuit using the crystal blank is integrated, the IC chip being accommodated within the second recess. The IC chip is provided with a plurality of IC terminals including a pair of crystal terminals used for electrical connection with the crystal blank. A plurality of mounting electrodes to which the IC terminals are connected through flip-chip bonding are formed on a bottom surface of the second recess in correspondence with the IC terminals. A pair of mounting electrodes corresponding to the pair of crystal terminals are electrically connected to the crystal blank and also formed as a pair of dual-purpose electrodes having greater areas than the other mounting electrodes.
Abstract: A Colpitts-type oscillator circuit suitable for use with electronic identification systems is disclosed. The oscillator circuit utilizes a pair of transistors coupled together with a feedback loop that includes a parallel LC circuit such that the output amplitude can be as high as a factor of 20 times the supply voltage or more while maintaining a high Q, low distortion output. The oscillator circuit is a modified Colpitts oscillator that includes a NPN transistor and a PNP transistor coupled together and a Colpitts type feedback loop containing a parallel LC circuit. The capacitance of the parallel LC circuit consists of at least two capacitors in series forming a capacitive divider which provides a low impedance feedback via the base of the NPN transistor into the emitter of the PNP transistor. The collector of the PNP transistor taps into the inductor of the parallel LC circuit such that the inductor is driven to resonance.
Abstract: A voltage-controlled variable oscillator, in particular for phase-lock loops, comprising a differential stage formed by a pair of transistors and collectors whereof define the output terminals between which an external resonating circuit is connected, a voltage generator which is connected between the two output terminals and is suitable for generating a voltage which is proportional to the terminal voltage which exists across the resonating circuit, and a pair of capacitors connected between a respective output terminal and the voltage source.
Abstract: A high frequency generator for sinusoidal output power includes an LC-parallel resonance circuit as an output circuit. A plurality of HF-modules of small output are coupled to the output circuit. Each HF-module consists of a controlled switch S1.1, S1.2, which is wired with a .lambda./4-line LL1, LL2. The coupling-in of the sinusoidal high frequency power occurring at the outputs of the .lambda./4-lines LL1, LL2 onto the output circuit occurs through coupling condensers CK1, CK2 and primary coils L1, L2. The voltage supply U.sub.B is provided by a timed circuit network portion 1, to which the line voltage 2 and a desired value 3 for the modulation of the HF-output power are fed. The operating voltage UB is fed to each HF-module through its own switch S2.1, S2.2, a filter condenser CL1, C12 and a .lambda./4-line LL7, LL8. Short-circuiting switches SK1, SK2 in parallel with each control switch S1.1, S1.2 see to it, in case of a switch malfunction, that the output circuit is only minimally detuned.
Abstract: A voltage controlled oscillator is provided with an LC parallel resonance circuit connected to the collector of one of a differential pair of transistors, and an amplifier and a capacitor which are connected between the collector of the one transistor and the base of the other transistor. The bases of the differential pair of transistors are equally biased. The emitters of the transistors are connected to a variable current source. The variable current source produces a current proportional to the square of control voltage. The frequency of the VCO can be changed by the control voltage with good linearity over a wide dynamic range. The variable current source causes the VCO characteristic to be linear. The value of the capacitor can be small, making the oscillator circuit well suited for integrated circuit fabrication.
Abstract: The generator produces a pulse train with a given pulse duty factor and a relatively small pulse width, and comprises an oscillator including a resonance circuit having multiple frequencies and tuned to the fundamental frequency corresponding to the pulse repetition rate and to at least the first and second harmonics of the fundamental frequency. On the output side, there is generated a sawtooth wave with a steep leading edge having an inflexion point. Differentiation members couple the resonance circuit to a load so that, as a result of matched differentiation of the steep leading edge of each sawtooth of the wave, a pulse, having a pulse width corresponding approximately to the pulse time of the leading edge, acts on the load.
Abstract: An oscillator utilizing a pair of transistors interconnected with a resonance circuit in the collector circuits thereof such that by regulation of the current flow to the connected emitters, the frequency of oscillation is regulated.
Abstract: In an induction energy transfer device comprising a static power conversion circuit for producing an alternating magnetic field of ultrasonic frequency of the type wherein the static power conversion circuit includes a parallel resonant circuit which comprises a coil which also couples power across an air gap, an improvement in efficiency and power transfer is obtained by including at least two such parallel resonant circuits in the power conversion circuit, one of which resonant circuits is tuned to the third harmonic of said fundamental frequency.
Abstract: A low distortion sinusoidal oscillator made up of a two transistor negative resistance element combined with an LC tank for generating bias and erase signals for battery powered magnetic media recording apparatus.
March 17, 1975
Date of Patent:
February 1, 1977
International Business Machines Corporation
Alan Frank Higginbotham, Kenneth Layton Jeffries
Abstract: A high power R.F. induction heating generator for inductively heating a load including a plurality of transistors of the same type series connected in a self-exciting class "C" oscillator configuration, a tank circuit having a tank coil electrically coupled to the output of the transistors, the tank coil having an impedance which matches the output impedance of the transistors and being adapted to be inductively coupled to the load for providing an oscillating R.F.