Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Reexamination Certificate
2007-02-06
2007-02-06
Chang, Joseph (Department: 2817)
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
C331S066000, C327S083000
Reexamination Certificate
active
10845661
ABSTRACT:
An oscillator circuit (100) can provide a dual slop temperature response. For a lower temperature range, a capacitor (106) can be charged and/or discharged according to a first current source (302) that provides an essentially constant current source. For a higher temperature range, the capacitor (106) can be charged and/or discharged according to a second current source (304) that can be enabled and/or provide current according to a voltage proportional to absolute temperature. A slightly positive temperature coefficient of a first current source (302) can be offset by a threshold detect circuit (210and212) within a second comparator circuit (204) that utilizes the threshold voltage (Vt) of a transistor (212) as a low limit for a capacitor voltage.
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Chang Joseph
Cypress Semiconductor Corporation
Sako Bradley T.
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