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Patent
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G05F 3/20 (2006.01) G05F 3/26 (2006.01) H03F 1/30 (2006.01) H03F 3/343 (2006.01) H03K 5/02 (2006.01) H03K 17/14 (2006.01)
Patent
CA 1182167
ABSTRACT OF THE DISCLOSURE A temperature-compensated reference voltage circuit includes a transistor having a positive temperature coefficient of current. A means for establishing a pre- determined current in the positive-temperature-coefficient of-current transistor is connected to that transistor. A predetermined resistance serially connects the positive- temperature-coefficient-of-current transistor with a transistor having negative temperature coefficient of base- to-emitter voltage. The temperature-compensated reference voltage is established between the transistors. The temperature-compensated reference voltage circuit is particularly useful in a supply voltage sense amplifier circuit for thermal printhead drive transistors or other load elements. The sense amplifier circuit includes means connected to receive the reference voltage of the reference voltage and a supply voltage. An output is adapted to be connected to a load for receiving the supply voltage. A means is connected to receive an input from the comparing means, and to said output, for enabling the output when the supply voltage is equal or greater than the reference voltage.
400915
Fairchild Camera And Instrument Corporation
Smart & Biggar
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