摘要:
An FM detector is constructed of a phase shift network and an analog multiplier. The analog multiplier includes a differential amplifier circuit and a phase detector circuit. The differential amplifier circuit includes differential pair transistors which are driven by FM intermediate frequency signals. A base emitter junction of a diode-connected transistor is connected across a base and an emitter of one of the differential pair transistors. The base of the one transistor and a base of the diode-connected transistor are connected to an emitter of an emitter-follower transistor, and the FM intermediate frequency signal is applied to a base of the emitter-follower transistor. Noise which develops in the base of the differential pair transistor or the base of the diode-connected transistor is reduced by the low output impedance of the emitter-follower transistor, so that the signal-to-noise ratio of the FM detector is improved.
摘要:
A sample material to be dehydrated is enclosed in a container transmissive to microwave and air is past through the container under a microwave radiation to preferentially remove the water content of the sample. The dehydrated sample may be incinerated by switching the air supply to an oxygen supply under the microwave radiation.
摘要:
An external skeletal fixation device includes first and second pin clamp units fixedly holding rodlike members inserted, respectively, into a first part and a second part of a bone on the opposite sides, respectively, of a virtual hinge point corresponding to a center of rotational angulation, a center on opposite sides of a fracture site of the bone or a part of the osteotomy site for deformity correction are turned, or a center about which a joint turns. A connecting mechanism connecting the first and second pin clamp units has first and second arms pivotally connected to the first and second pin clamp units, respectively. The respective axes of rotary joints respectively connecting the first pin clamp unit and the first arm, the second pin clamp unit and the second arm, and the first arm and the second arms extend toward the virtual hinge point.
摘要:
The present invention provides an industrially useful chitosan-containing composition in the form of any of a transparent aqueous solution, gel or dry powder having a neutral to weakly alkaline pH when in the form of an aqueous solution that can be applied to pharmaceutical additives, foods, beverages and cosmetics. A production process of the chitosan-containing composition of the present invention has a step for preparing an acidic chitosan aqueous solution, a step for forming a solid by removing a water-soluble salt from a salt formed by mixing an acidic polymer component into the acidic chitosan aqueous solution, and a step for dissolving the solid in a weakly basic solution.
摘要:
The present invention provides a PEG-modified HAP having a high degree of safety and novel functions by modifying the surface of hydroxyapatite particles with a polyethylene glycol derivative, applications thereof, and a production process of the same. The PEG-modified HAP of the present invention is a substance in which hydroxyapatite having a particle diameter of 50 μm to 10 nm is bonded to a polyethylene glycol derivative having a carboxyl group as a terminal functional group through —O(CO) bonds, and the carbon content thereof is 10 to 0.1%. In addition, the present invention is a substance composed of this substance and a pharmaceutical active ingredient or pharmaceutical additive, in which the weight ratio of the pharmaceutical active ingredient is 1 to 30%, and the substance is obtained by treating hydroxyapatite having a particle diameter of 50 μm to 10 nm and an active ester of polyethylene glycol derivative having a carboxyl group as a terminal functional group in an anhydrous organic solvent.
摘要:
A transceiver suitable for larger scale of integration employs direct conversion reception for reducing the number of filters. Also, the number of VCOs is reduced by utilizing dividers to supply a receiver and a transmitter with locally oscillated signals at an RF band. Dividers each having a fixed division ratio are used for generating locally oscillated signals for the receiver, while a divider having a switchable division ratio are used for generating the locally oscillated signal for the transmitter. In addition, a variable gain amplifier for baseband signal is provided with a DC offset voltage detector and a DC offset canceling circuit for supporting high speed data communications to accomplish fast cancellation of a DC offset by eliminating intervention of a filter within a feedback loop for offset cancellation.
摘要:
The invention provides a signal processing semiconductor integrated circuit of the direct conversion system, which includes a dummy amplifier having the same circuit configuration as a low noise amplifier being the first stage amplifier, in which the DC offset calibrations on the subsequent stage amplifiers are carried out during shifting into the reception mode in a state that the low noise amplifier is deactivated and the dummy amplifier is activated. Thereby, the invention achieves to suppress generation of the DC offsets resulting from the leakage noises of the local oscillator during shifting into the reception mode, and to enhance the reception sensitivity.
摘要:
There are provided a transmitter and a wireless communication terminal apparatus using the same for solving a problem of undesired spurs due to harmonics of an output signal of a frequency synthesizer, and further solving a problem of the undesired spurs occurring when the harmonics of an output signal of a crystal oscillator are mixed into a VCO to facilitate to design a circuit or a mounting substrate. The transmitter has a relationship between an output frequency of a PLL frequency conversion circuit (5) and output frequencies of frequency synthesizers (1, 2) stored therein, and the output frequencies of the frequency synthesizers (1, 2) input into the PLL frequency conversion circuit (5) are controlled on the basis of the relationship so that the undesired spurs are suppressed. Thereby, even when the undesired spurs occur in the output of the transmitter due to a crosstalk between circuits or through a substrate, which can be easily suppressed, it is therefore possible to reduce time and cost for redesigning the circuit or the substrate.
摘要:
Disclosed is a direct conversion type transmitter or transceiver circuit suitable for a mobile communication device which corresponds to broad signal output level variable width to be required by W-CDMA, which does not necessitate any high-performance low noise VCO and RF filter, capable of reducing a number of components and the cost. In the input portion of an orthogonal modulator composed of a divider, mixers, and a common load, there are provided variable attenuators. If an input signal level of the orthogonal modulator within the transmitter circuit lowers, this variable attenuator circuit is operated so as to lower the bias of the orthogonal modulator to reduce the amount of occurrence of carrier leak, and to prevent the signal during low output level and carrier leak ratio from being deteriorated. The direct conversion transmitter circuit is capable of easily realizing output level variable width of 70 dB or higher and reducing a variable amount in the high frequency circuit in which it is difficult to secure the variable gain width.
摘要:
An eight-channel PCM recorder is utilized for recording two channels of delta-sigma modulated audio signals. Employed to this end is a PCM adapter comprising a bit stream divider for dividing the bit streams of the delta-sigma modulated signals into series of sixteen-bit segments, and a reformatter for rearranging the bit segments into eight signals having a format in agreement with the format of the PCM signals normally handled by the PCM recorder. The eight reformatted delta-sigma signals are introduced into the PCM recorder thereby to be recorded in place of the eight channels of PCM signals.