1
Takashi Ueno, Tadashi Arai, Tetsuro Itakura: Variable gain amplifier. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt P C, February 10, 2004: US06690232 (138 worldwide citation)

A variable gain amplifier device comprises a variable gain amplifier circuit which amplifies a difference between an input signal and a feedback signal to output an output signal, a feedback circuit which supplies the feedback signal to the variable gain amplifier circuit, and a controller which con ...


2
Hiroshi Tsurumi, Hiroshi Yoshida, Tetsuro Itakura, Takafumi Yamaji, Akira Yasuda, Takashi Ueno, Hiroshi Tanimoto, Ryuichi Fujimoto, Hiroshi Horiguchi: Receiver having DC offset decreasing function and communication system using the same. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt P C, December 24, 2002: US06498929 (71 worldwide citation)

A receiver having a function of a direct current offset, and including a receiving section for receiving a radio frequency signal, an analog signal processing section for amplifying, band-converting and frequency-converting an analog signal inputted from the receiving section, and an AD converting s ...


3
Tetsuro Itakura: Differential input circuit and operational amplifier with wide common mode input voltage range. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt, January 18, 1994: US05280199 (65 worldwide citation)

A differential input circuit capable of realizing a wide common mode input range, without using a current summing circuit, in which the total output current is independent of the common mode input voltage level. The circuit includes: a first differential pair formed by two transistors connected to a ...


4
Takafumi Yamaji, Osamu Watanabe, Hiroshi Tanimoto, Tetsuro Itakura, Shoji Otaka, Ryuichi Fujimoto: Frequency converter and radio receiver using same. Kabushiki Kaisha Toshiba, Foley & Lardner, November 30, 1999: US05995819 (45 worldwide citation)

A frequency converter includes: a signal synthesizer element for inputting first and second input signals to synthesize these signals and for outputting a synthesized signal, from which noises even times as large as the frequency of the second input signal are removed; an amplitude limitation amplif ...


5
Takashi Taguchi, Takeshi Shima, Tetsuro Itakura: D/A conversion circuit and liquid crystal display device. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt P C, April 15, 2003: US06549196 (45 worldwide citation)

A D/A conversion circuit which can perform D/A conversion at high speed and with high precision is disclosed. The D/A conversion circuit comprises an analog reference power supply, an output buffer, a multiplexer, a pre-buffer, and a current changeover switch. The pre-buffer operates with a power su ...


6
Tetsuro Itakura: Sample-and-hold circuit and liquid crystal display apparatus. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt, October 12, 1993: US05252957 (32 worldwide citation)

A sample-and-hold circuit device includes a plurality of sampling field effect transistors for sampling an input signal in response to sampling pulses sequentially supplied from a sampling pulse transferring section, a plurality of charge-holding capacitors for respectively holding signal charges sa ...


7
Zdzislaw Czarnul, Hiroshi Tanimoto, Tetsuro Itakura: Balanced amplifier using single-ended output operational amplifiers. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt P C, November 23, 1999: US05990737 (31 worldwide citation)

A balanced amplifier includes first and second multi-input single-ended output differential amplifiers having matched characteristics and a feedback circuit. The feedback circuit connects differential input terminals and output terminals of the first and second multi-input single-ended output differ ...


8
Tetsuro Itakura, Takeshi Shima: Amplifier circuit and liquid-crystal display unit using the same. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt P C, November 12, 2002: US06480178 (31 worldwide citation)

An amplifier circuit comprising an input stage and an output stage which are cascade-connected between a signal input terminal to which an input signal is input and a signal output terminal to which a capacitive load is connected and which includes at least an input amplification stage and an output ...


9
Akira Yasuda, Tetsuro Itakura, Takafumi Yamaji: A/D converter apparatus with frequency conversion function and radio apparatus using the same. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt P C, November 24, 1998: US05841388 (28 worldwide citation)

An A/D converter apparatus comprising a negative feedback loop having a main signal line supplied with an input signal of a predetermined frequency and a feedback signal line passing through a feedback signal, a A/D converter connected to the main signal line for frequency-converting the input signa ...


10
Takafumi Yamaji, Tetsuro Itakura, Hiroshi Tsurumi: Variable-gain amplifier circuit, offset control method in variable-gain amplifier circuit, radio receiver with variable-gain amplifier circuit, and radio receiving method in radio receiver with variable-gain amplifier. Kabushiki Kaisha Toshiba, Foley & Lardner, February 2, 1999: US05867777 (26 worldwide citation)

A variable-gain amplifier circuit has an offset correcting function by which the fluctuation of offset due to the switching of a gain is decreased. In an offset detection mode, an input offset voltage of the variable-gain amplifier circuit is inputted to an offset retaining section, and in a signal ...