A compact constant current generator that can operate with a positive supply voltage of 1.22 V (or lower) and minimize noise is provided. The constant current generator can include a bandgap reference circuit and a single gain stage. Notably, the bandgap reference circuit can advantageously generate differential node voltages. The gain stage can amplify those differential node voltages and generate a constant current having a temperature coefficient substantially equal to zero. Advantageously, this single gain stage can minimize the number of components, thereby resulting in a compact and efficient current generator.