Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-09-23
1999-09-07
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327 87, 327540, 327541, G05F 110
Patent
active
059492740
ABSTRACT:
The present invention discloses an integrated constant bias voltage generator using only active devise to simulate a high impedance node, as seen from a capacitively coupled input signal. A reference current source an MOS device are coupled in series between Vcc and ground with the drain electrode of the MOS device being the constant bias voltage output. An input signal capacitively coupled to said drain electrode introduces an error current monitored by a current monitoring means. A feedback means responsive to the current monitoring means modulates the control input of the MOS device to select a IDS vs. VDS characteristic curve which will maintain the VDS voltage constant for any given IDS current, including the error current. The feedback means also compensates for voltage fluctuations in Vcc.
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patent: 5805010 (1998-09-01), Wu
Atmel Corporation
Callahan Timothy P.
Haro Rosalio
Kim Jung Ho
Schneck Thomas
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