Power distribution circuit
A transformer ( 2 A) outputs differential signals of a positive phase signal (Vout 2 Ap) having phase θ1+90° and a negative phase signal (Vout 2 An) having phase θ1−90°. A transformer ( 2 B) outputs differential signals of a positive phase signal (Vout 2 Bp) having phase θ2+90° and a negative phase signal (Vout 2 Bn) having phase θ2−90°. An adding circuit ( 3 ) composes a pair of differential output signals, as signals corrected in phase error (θ1−θ2) generated in the transformers ( 2 A, 2 B), in a manner of summing up vectors of two pairs of the differential signals outputted from the transformers ( 2 A, 2 B) for the positive phase signal and the negative phase signal, respectively.
1. A power distribution circuit for receiving an input of a pair of differential input signals and outputting a pair of differential output signals, the differential output signals having a positive phase signal and a negative phase signal, the power distribution circuit comprising:
a first unbalance-to-balance transformer, configured to receive an input of the positive phase signal of the pair of differential input signals and to output differential signals;
a second unbalance-to-balance transformer, configured to receive an input of the negative phase signal of the pair of differential input signals and to output differential signals; and
an adding circuit, configured to add the positive phase signals to each other and add the negative phase signals to each other among two pairs of the differential signals outputted from the first and second unbalance-to-balance transformers to thereby output the pair of differential output signals,
wherein the first unbalance-to-balance transformer and the second unbalance-to-balance transformer are connected in parallel to each other.
2. The power distribution circuit according to claim 1 , further comprising:
a third unbalance-to-balance transformer, configured to convert an unbalanced input signal into a pair of differential signals and output the pair of differential signals as the pair of differential input signals;
a first amplifier, configured to amplify a positive phase signal of the pair of differential input signals outputted from the third unbalance-to-balance transformer; and
a second amplifier, configured to amplify a negative phase signal of the pair of differential input signals outputted from the third unbalance-to-balance transformer, wherein
the first unbalance-to-balance transformer receives an input of the positive phase signal amplified by the first amplifier, and
the second unbalance-to-balance transformer receives an input of the negative phase signal amplified by the second amplifier.
3. The power distribution circuit according to claim 1 , wherein
the first unbalance-to-balance transformer and the second unbalance-to-balance transformer are configured by using a fourth unbalance-to-balance transformer, configured to receive an input of the pair of differential input signals and output two pairs of differential output signals for the positive phase signal and the negative phase signal, respectively.
4. The power distribution circuit according to claim 1 , wherein
the first unbalance-to-balance transformer, the second unbalance-to-balance transformer and the adding circuit are configured by using a fifth unbalance-to-balance transformer, configured to combine the positive phase signal of the pair of differential input signals with the positive phase signal and the negative phase signal of the differential output signals, and combine the negative phase signal of the pair of differential input signals with the positive phase signal and the negative phase signal of the differential output signals to thereby output the pair of differential output signals.
5. The power distribution circuit according to claim 3 , wherein
the fourth unbalance-to-balance transformer is configured by using transmission lines, and two output transmission lines are combined with one input transmission line so that half of a length of the transmission line to a grounding point from each of input terminals of the pair of differential input signals equals to a length of the transmission line to a grounding point from each of output terminals of the two pairs of differential output signals.
6. The power distribution circuit according to claim 4 , wherein
the fifth unbalance-to-balance transformer is configured by using transmission lines, and one output transmission line is combined with two input transmission lines so that half of a length of the transmission line to a grounding point from each of input terminals of the pair of differential input signals equals to a length of the transmission line to a grounding point from each of output terminals of the pair of differential output signals.
7. The power distribution circuit according to claim 1 , wherein
a capacitor is disposed between a ground and an input terminal having no input of the first and second unbalance-to-balance transformers, and a constant voltage power supply is provided in parallel to the capacitor.
8. The power distribution circuit according to claim 2 , wherein
a capacitor is disposed between a ground and a midpoint between output terminals for the positive phase signal and the negative phase signal of the third unbalance-to-balance transformer, and a constant voltage power supply is provided in parallel to the capacitor.
9. The power distribution circuit according to claim 1 , wherein
the adding circuit is configured by using transmission lines, and input signals of same phase components of two positive phase signals and two negative phase signals are summed up in the transmission lines having a same length to thereby extract the pair of differential output signals from a midpoint of the transmission lines.
10. The power distribution circuit according to claim 1 , wherein
the adding circuit is configured by using transmission lines, and input signals of different phase components of two positive phase signals and two negative phase signals are summed up in the transmission lines having a same length to thereby extract the pair of differential output signals from the transmission lines.