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Inventor:
Nakanishi; Eiichi
Address:
Tokyo, JP
No. of patents:
9
Patents:












Patent Number Title Of Patent Date Issued
5832373 Output power control device November 3, 1998
An output power control device is provided with an isolator, to which a transmission signal, that has been power amplified by a power amplifier, is input. The transmission signal is input via a transmission line connected to an output side of the power amplifier. The isolator only pa
5818392 Antenna with fixed and movable elements October 6, 1998
In a mobile radio transceiver, an antenna has a fixed element and a movable element. When the movable element is in an extended state, the movable element functions. On the other hand, when the movable element is in a retracted state, the fixed element functions. An impedance matching
5722062 Linear receiver having dual automatic gain control loops February 24, 1998
A linear receiver is disclosed which includes a linear receiver having: a preamplifier for amplifying linearly a modulated carrier signal (RF signal) having a first frequency trapped by an antenna; a mixer for converting the RF signal into an intermediate frequency signal having a se
5701597 Portable electronic device and method for supplying current to different loads December 23, 1997
According to a first aspect, a portable electronic device has at least two load circuits which are independently powered by different batteries. According to a second aspect, the load circuits are powered by the same battery, but their power lines are branched from a node located close t
5247542 QPSK power amplifier distortion correction system September 21, 1993
A quadrature phase-shift keying modulator produces a QPSK signal which is amplified by a power amplifier. The amplitude gain of the power amplifier is controlled in response to an amplitude difference between the QPSK signal output by the modulator and the amplified QPSK signal output by
5182527 Power amplifying apparatus for wireless transmitter January 26, 1993
A power amplifying apparatus according to the present invention can provide a stable electric power output with wide range by controlling both of the output amplifier for amplifying the electric power and the pre-amplifier disposed at the front of the output amplifier. Furthermore, in or
5144258 Power amplifier system for radio transmitter and method for using the same September 1, 1992
A power amplifier system suitable for a mobile radio receiver/transmitter is described. A wave form signal to be transmitted is made smooth during its rise and fall times, thereby making it possible to prevent a transmission spectrum from expanding and interfering with the adjacent c
5138274 Linear amplifier circuit August 11, 1992
In a linear amplifier circuit, an amplifier amplifies an input signal to produce an output signal, an input signal envelope detector detects the envelope of the input signal, and an output signal envelope detector detects the envelope of the output signal. The difference between the
5126688 Power amplifying apparatus for wireless transmitter June 30, 1992
A power amplifying apparatus according to the present invention can provide a stable electric power output with wide range by controlling both of the output amplifier for amplifying the electric power and the pre-amplifier disposed at the front of the output amplifier. Furthermore, in or










 
 
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