摘要:
An amplifier comprised of a field effect transistor whose gate electrode is adapted to receive an input signal. An impedance converter couples the input signal to the gate electrode of the field effect transistor, the impedance converter being formed of n impedance converting stages, each stage having a relatively low output impedance. A voltage limiting circuit is connected between the source of input signal and the gate electrode of the field effect transistor so as to limit the forward biasing of the field effect transistor. This voltage limiting circuit includes m voltage-limiting elements, wherein n and m are integers (1, 2, 3, . . . ) and n is equal to or greater than m. In a preferred embodiment, the amplifier is formed of two field effect transistors connected in push-pull relation, each field effect transistor being provided with an impedance converter and a voltage-limiting circuit as described above.
摘要:
An amplifier having ready application as an amplifier for pulse width modulated signals, is comprised of first and second field effect transistor devices which exhibit triode-type dynamic characteristics. These field effect transistor devices are connected in push-pull amplifying relation for receiving a signal to be amplified and for supplying an amplified signal to a load. A low-pass filter device connects the load to the push-pull field effect transistor devices. The output terminals of the field effect transistor devices are connected in series across a voltage supply which is used to supply the energizing voltages to the transistor devices.
摘要:
A transistor amplifier is comprised of a first differential amplifier for receiving an input signal and a second differential amplifier coupled to the output of the first differential amplifier. An output stage is coupled to the second differential amplifier and is comprised of a pair of complementary field effect transistors connected in push-pull configuration. Each of the field effect transistors has triode-type dynamic characteristics and is adapted to receive both a bias voltage and an amplified signal from the output of the second differential amplifier. Changes in the operating voltage supplied to the field effect transistors are injected into one of the differential amplifiers so as to effect a corresponding change in the bias voltage which is applied to the field effect transistors. This bias voltage change compensates for changes in the operating voltage so as to stabilize the field effect transistor drain currents at a constant value notwithstanding these operating voltage changes.
摘要:
A pulse width modulated signal amplifier includes a first input terminal supplied with a rectangular wave signal as a carrier, a second input terminal supplied with a modulating signal, such as an audio signal, an integrator supplied with both the rectangular wave signal and the modulating signal, a high gain amplifier receiving the output of the integrator, a low pass filter receiving the output of the high gain amplifier and producing a demodulated signal corresponding to the modulating signal and which is supplied to an output terminal, and a negative feedback circuit connected between the output of the high gain amplifier and the input of the integrator.
摘要:
Audio-centered information is stored on a unitary medium by using a Table-of-Contents (TOC) mechanism that specifies an actual configuration of various audio items on the medium. In particular, each one of a set of one or more Track Areas gets at least two mutually logically conforming Sub-TOCs assigned. This allows to retrieve any constituent Sub-TOC part from at least any correct copy of the Sub-TOCs. Furthermore, one or more Master-TOCs are provided for specifically pointing to each of the Sub-TOCs.
摘要:
In an optical recording and reproducing medium having a groove 2 formed along a recording track and which is recorded and/or reproduced with irradiation of light L having a predetermined wavelength λ, a track pitch p of the groove 2 is selected in a range of from 200 nm to 350 nm and a ratio wg′/p between a width wg of the groove 2 and the track pitch p is selected in a range of from 0.24 to 0.67.
摘要:
An optical recording/reproducing medium having grooves formed along recording tracks and used for recording/reproducing when irradiated with light L with a specified wavelength λ, wherein the track pitch p of a groove is at least 200 nm and up to 350 nm, and a ratio wg′/p between the width wg of a groove and a track pitch p is at least 0.24 and up to 0.67.
摘要:
Binary information previously recorded in an innermost rim side area is enabled to be stably reproduced. A record medium is formed by sequentially laminating a first information layer 2, an intermediate layer 3, a second information layer 4, and a cover layer 5 onto a substrate 1. First grooves are previously formed in the innermost rim area of the substrate 1. Second grooves are previously formed in an area where data is recorded. The first grooves are set to be shallower and narrower than the second grooves. Thus, such a situation that a BCA signal is modulated by diffraction due to the grooves can be reduced.
摘要:
In an optical device, a number of structures having higher portions or lower portions are arranged at a fine pitch equal to or shorter than a wavelength of visible light on a surface of a base. Each of the structures is arranged to form a plurality of arc track rows on the surface of the base, and to form a quasi-hexagonal lattice pattern, and the structure has an elliptical cone or truncated elliptical cone shape having a major axis in a circumferential direction of the arc tracks.
摘要:
A dial type switch mechanism is developed in which an installation space can be made as small as possible. In a dial type switch mechanism (10) furnished with a push type switch part provided in its center, and a dial switch part which operates a dial fitted around the push type switch part, there are provided: a substantially cylindrical dial knob (21), in the center of which a cavity is provided for the push type switch part to be installed; a ring-shaped joint ring (23), which is supported such that it can rotate freely relative to a front panel (6) and connects and rotates together with the dial knob (21); and a rotary bracket (24), which is joined to the joint ring (23), and in which a switch rotation shaft (24b) that operates the dial type switch part is connected together with a ring-shaped member (24a) via an arm (24c).