ACTIVE BALUN CIRCUIT AND TRANSFORMER

摘要

An active balun circuit includes a CG transistor having a source terminal thereof connected to an input terminal and a gate terminal thereof grounded, a CS transistor having a gate terminal thereof connected to the input terminal and a source terminal thereof grounded, an asymmetrical transformer, a first output terminal, and a second output terminal. The asymmetrical transformer includes a primary coil and a secondary coil. The primary coil includes a first inductor connected to the CG transistor and a second inductor connected to the CS transistor. The secondary coil includes a third inductor associated with the first inductor and a fourth inductor associated with the second inductor. The first output terminal outputs a first signal generated at the third inductor, and the second output terminal outputs a second signal generated at the fourth inductor.

主权项

1. An active balun circuit comprising:
an input terminal to receive a single-ended signal; a first field effect transistor having a source terminal thereof connected to the input terminal and a gate terminal thereof grounded; a second field effect transistor having a gate terminal thereof connected to the input terminal and a source terminal thereof grounded; a transformer including a primary coil and a secondary coil, the primary coil including a first coil connected to a drain terminal of the first field effect transistor and a second coil connected to a drain terminal of the second field effect transistor, the secondary coil including a third coil associated with the first coil and a fourth coil associated with the second coil; a first output terminal connected to the third coil to output a signal generated at the third coil, as a first signal having a phase that is a same as a phase of the single-ended signal; and a second output terminal connected to the fourth coil to output a signal generated at the fourth coil, as a second signal having a phase that is deviated from the phase of the single-ended signal by 180 degrees.