| CPC G05F 3/22 (2013.01) [G05F 3/30 (2013.01)] | 14 Claims |
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1. A self-starting bandgap cell for generating a reference voltage, the self-starting bandgap cell comprises:
a negative threshold transistor configured to provide an operating current when coupled to a supply voltage, the reference voltage being generated when the operating current flows in the self-starting bandgap cell;
an amplifier comprising a first input terminal, a second input terminal and an output terminal, the output terminal being coupled to a gate of the negative threshold transistor, wherein the amplifier comprises a BJT input pair comprising:
a first input bipolar junction transistor; and
a second input bipolar junction transistor;
a resistor string comprising a plurality of resistive elements coupled in series with the negative threshold transistor, the resistor string being coupled to the first and second input terminals of the amplifier, wherein the plurality of resistive elements comprises a first resistor, a second resistor and a third resistor; and
a first circuit component coupled to the resistor string,
wherein:
the first input bipolar junction transistor is coupled to one of the first input terminal and the second input terminal and the second input bipolar junction transistor is coupled to the other of the first input terminal and the second input terminal;
the BJT input pair is configured to receive an amplifier bias current;
the first circuit component comprises a first terminal coupled to the third resistor and a second terminal coupled to the negative threshold transistor at an output node, the reference voltage being provided at the output node during operation;
a base of the first input bipolar junction transistor is coupled to the first input terminal; and
a base of the second input bipolar junction transistor is coupled to the second input terminal.
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