Patent ID: 6930517

Claim:
A method of forming a differential transistor comprising: forming an enhancement mode transistor of a first conductivity type having a source coupled to a source of a depletion mode transistor of a second conductivity type; forming a threshold voltage of the enhancement mode transistor so that an absolute value of the threshold voltage of the enhancement mode transistor is no greater than an absolute value of a threshold voltage of the depletion mode transistor; forming a second depletion mode transistor having a gate and a source coupled to receive a voltage from a voltage source and having a drain coupled to a gate of one of the enhancement mode transistor and the depletion mode transistor; forming a third depletion mode transistor having a drain coupled to a drain of the depletion mode transistor and having a gate and a source coupled to a gate of the other one of the enhancement mode transistor and the depletion mode transistor.