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Assignee: Niigata Seimitsu Co., Ltd.


Location: Jyoetsu-shi, JP
No. of patents: 7

NumberTitleIssue Date
7602248Power amplifier and its idling current setting circuit
An idling current setting circuit (3) includes: current setting transistors (Q3, Q4) connected to output transistors (Q1, Q2) in a driver (2) in current mirror form; a plurality of current setting resistors (R1 to R
10/13/2009
7579888Frequency synthesizer and charge pump circuit used therein
There are included a signal generating circuit (8) that generates, based on a comparison signal outputted from a phase comparator (3) and a clock signal outputted from a crystal oscillation circuit (1) and having a shorter pulse width than the c...
08/25/2009
7561863Automatic gain control device
A received signal level is detected in each of a wide band, middle band, and narrow band and each detected signal is converted to a digital signal. A DSP 18 determines the enabled/disabled state of an LNA 3 and an attenuator 4 as well as a gain ...
07/14/2009
7551906AM/FM radio receiver and local oscillator circuit used therein
A couple of frequency doubler circuits 21 and 22 which multiplys a frequency of a reference oscillation signal outputted from a reference oscillator 12 is provided, thereby a frequency of a reference oscillation signal, as the greatest common di...
06/23/2009
7496419Modulation output device
A modulation output device including; a DSP 12 for subjecting MP3 music data and the like read out from an MP3 player 50 to stereo modulation, when necessary; D/A converter 14 for converting the digital data outputted from the DSP 12 to a...
02/24/2009
7443240AM intermediate frequency variable gain amplifier circuit, variable gain amplifier circuit and its semiconductor integrated circuit
It is an object of the present invention to provide a variable gain amplifier circuit operable with a low power supply voltage and with less noise generated inside the circuit. In the variable gain amplifier circuit, a third MOS transistor is connected between the r...
10/28/2008
7432769Oscillator circuit
The oscillating unit 11 generates a signal having a frequency of n*f, i.e., n times a target frequency f. The control voltage generation circuit 21 compares the phase difference between a divided signal of a signal generated in the oscillating unit ...
10/07/2008
 
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