Low voltage bipolar drive circuits

Details Low voltage bipolar drive circuits Low voltage bipolar drive circuits

H - Electricity

03

F

H03F 1/30 (2006.01) H03K 17/14 (2006.01) H03K 17/60 (2006.01)

Patent

CA 2302887

A bipolar drive circuit comprises a differential or single-ended current mirror with signal inputs and outputs connected via resistors to a low voltage supply, e.g. 1.5 volts. A signal output voltage swing is determined and stabilized by a compensation circuit comprising a transistor having a base supplied with a reference voltage, a collector coupled via a resistor to the low voltage supply, and an emitter coupled via a resistor to ground, and a current mirror having an input coupled to the collector of the transistor and a current mirror output coupled to each signal input. A plurality of current mirror circuits can be connected in cascade, and the signal output voltage swing of each current mirror circuit can be similarly determined. The arrangement facilitates providing a drive circuit with high frequency, low supply voltage, and low power operation without transistor saturation.

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