Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
2009-09-08
2011-12-27
Chang, Joseph (Department: 2817)
Oscillators
Solid state active element oscillator
Transistors
C331S143000
Reexamination Certificate
active
08085102
ABSTRACT:
The low-power relaxation oscillator comprises a first module (21) having a ramp generator formed by a reference current source (31) and a storage capacitor (32) defining a ramp voltage (Vramp1), and a voltage comparator (m1,m2) for comparing the ramp voltage with a reference voltage, a second module (22, 41, 42,Vramp2, m3,m4) similar to the first module and an asynchronous flip-flop (23) receiving the output signal of the comparator of the first module at a first input (s) and the output signal of the comparator of the second module at a second input (r). For each module a generator of said reference voltage is configured by adding a reference resistance (33, 43) between the reference current source and the storage capacitor. Thus, the generation of the reference voltage and the ramp voltage is conducted on the very same current branch. This enables the electrical power consumption of the oscillator to be reduced.
REFERENCES:
patent: 5070311 (1991-12-01), Nicolai
patent: 5565819 (1996-10-01), Cooper
patent: 5638031 (1997-06-01), Danstrom
patent: 6157270 (2000-12-01), Tso
patent: 6720836 (2004-04-01), Lin
patent: 7030707 (2006-04-01), Lee et al.
patent: 7034627 (2006-04-01), Kudari
patent: 2005/0077971 (2005-04-01), Bashar
patent: 2007/0279137 (2007-12-01), Molina
patent: 0 407 269 (1991-01-01), None
European Search Report issued in corresponding application No. EP 08 16 3797, completed Jan. 9, 2009.
Chang Joseph
EM Microelectronic-Marin S.A.
Griffin & Szipl, P.C.
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