Patent ID: 9614498
Date: 2017-04-04
CPC Classifications: H03H

Claim:
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.