Avago Technologies Ecbu IP (singapore) Pte. Ltd.

Wai-Keat Tai

Kok-Soon Yeo

John Julius De Leon Asuncion

Lian-Chun Xu

Chee-Keong Teo

A reference voltage circuit includes first circuitry that generates a thermal voltage that is approximately proportional to absolute temperature, a first voltage multiplier, second circuitry that generates an inverse thermal voltage that is approximately inversely proportional to absolute temperature, a second voltage multiplier and a summer. The first voltage multiplier multiplies the thermal voltage to obtain a first multiplied voltage. The multiplied voltage is not equal to the thermal voltage. The second voltage multiplier multiplies the inverse thermal voltage to obtain a second multiplied voltage. The summer sums the first multiplied voltage with the second multiplied voltage to obtain a reference voltage.

Bandgap reference voltage circuit

In one embodiment, a comparator is provided with a first differential input stage that receives an input voltage and a reference voltage and produces a first differential output, and a second differential input stage that has differential inputs and produces a second differential output. A comparator stage produces a comparator output in response to the first and second differential outputs. The comparator also has a hysteresis control circuit, the components of which include 1) a resistor and a hysteresis regulating voltage input, coupled between the differential inputs of the second differential input stage, 2) first and second current generators, and 3) at least one switch, under control of the comparator output, to alternately enable different combinations of the first and second current generators, thereby inducing a first or a second current through the resistor.

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Singapore, Singapore

Wai-Keat Tai