Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1996-04-15
1997-08-26
Krishnan, Aditya
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
G05F 308
Patent
active
056614284
ABSTRACT:
A frequency adjustable, zero temperature coefficient referencing ring oscillator circuit includes a plurality of inverter stages each having a switching circuit that produces the oscillating output signal for the ring oscillator circuit and a control circuit that controls the switching circuit to establish the frequency of the output signal, the control circuit including field-effect transistors which are operated as output resistance controllable devices and which have their operating points, and thus their output resistances, established by a reference voltage that is produced by a precision reference voltage generating circuit so that the operating frequency of the ring oscillator circuit can be set by adjusting the value of the reference signals produced by the precision reference signal generating circuit and is maintained at the setpoint value because the precision reference voltage generating circuit operates independently of variations in temperature and/or the power supply voltage. The ring oscillator circuit is fabricated as an integrated circuit device and the operating frequency of the integrated circuit ring oscillator circuit can be adjusted after fabrication and passivation of the integrated circuit device.
REFERENCES:
patent: 5126590 (1992-06-01), Chern
patent: 5182529 (1993-01-01), Chern
Hoi-Jung Yoo, et al., "A Precision CMOS Voltage Reference with Enhanced Stability for the Application to Advanced VLSI's", 1993 IEEE International Symposium on Circuits and Systems, vol. 2 of 4, 1318-1321, (May 3-6, 1993) .
Li Wen
Ma Manny K. F.
Krishnan Aditya
Micro)n Technology, Inc.
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