| 摘要 |
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 ( 210 and 212 ) 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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