Current source device, oscillator device and pulse generator

Details Current source device, oscillator device and pulse generator Current source device, oscillator device and pulse generator

2008-07-18

2011-10-18

Kinkead, Arnold (Department: 2817)

Oscillators

Ring oscillators

C331S185000, C327S108000, C327S109000, C327S315000, C327S538000, C327S539000, C327S543000

Reexamination Certificate

active

08040195

ABSTRACT:
A current source device that cuts off an output current when stopped and obtains a desired output current upon start-up includes a first circuit having a first FET and resistors in series, a second circuit having second and third FETs in series with a point between the second and third FETs and a gate of the third FET connected, a drive circuit supplying a common drive voltage to gates of the first and second FETs, and first and second current source circuits responsive to first and second drive voltages that are gate voltages of the second and third FETs. The first and second current source circuits respectively include first and second current source FETs having the first and second drive voltages as gate voltages, and a start-up circuit changing the first and second drive voltages forcedly when the first and second current source FETs are made conductive.

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patent: 2007/0057717 (2007-03-01), Choi
patent: 2005078510 (2005-03-01), None

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