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Mitsutoshi Sugawara Phones & Addresses

  • San Jose, CA
  • Santa Clara, CA
  • 10308 Brittany Ct, Cupertino, CA 95014
  • 19608 Pruneridge Ave, Cupertino, CA 95014
  • Los Angeles, CA

Publications

Us Patents

Regulated Low-Voltage Generation Circuit

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US Patent:
6384586, May 7, 2002
Filed:
Dec 8, 2000
Appl. No.:
09/733650
Inventors:
Mitsutoshi Sugawara - Cupertino CA
Assignee:
NEC Electronics, Inc. - Santa Clara CA
International Classification:
G05F 316
US Classification:
323313, 326316
Abstract:
A voltage reference generating circuit for providing voltage references substantially less than the typical 1300 mV, with a controllable thermal coefficient. By forcing equal-valued currents through two semiconductor junctions having disparate junction areas, a voltage differential is developed, as is a current proportional to the voltage differential. The voltage differential, and a current proportional to the voltage differential, have positive thermal coefficients. A third semiconductor junction is biased from a third current source and bridged by a resistor pair so as to synthesize a Thevenin-equivalent voltage equivalent series resistance. The equivalent voltage has a negative thermal coefficient. By forcing a current that is equal to the proportional current through the equivalent resistance, a reference voltage, equal to the sum of the Thevenin-equivalent voltage plus the voltage drop across the Thevenin-equivalent resistance, is created.

Active Hybrid Transformer Circuit Having A Replica Driver

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US Patent:
7190194, Mar 13, 2007
Filed:
Feb 13, 2004
Appl. No.:
10/777676
Inventors:
Takeshi Nagahori - Kawasaki,
Mitsutoshi Sugawara - Santa Clara CA,
Assignee:
NEC Electronics Corporation - Kanagawa
NEC Electronics America, Inc. - Santa Clara CA
International Classification:
H03K 3/00
US Classification:
327110
Abstract:
In an active hybrid transformer circuit connected to both transmit and receive sides, a current driver is connected to a transmission path circuit through a common connection point of a load resistor and a replica resistor while a replica driver is connected to the replica resistor of which another connection point is directly connected to the receive side. The replica driver may be formed by a DAC of a current output type. A current ratio of the replica driver and the current driver is selected at a predetermined value so as to prevent a transmit signal from leaking into the receive side.
Mitsutoshi Sugawara from San Jose, CA, age ~72 Get Report