SINGLE-PHASE DIFFERENTIAL CONVERSION CIRCUIT
A single-phase differential conversion circuit of the present invention is provided with a differential amplifier including a positive-phase circuit for processing a positive-phase signal and a negative-phase circuit for processing a negative-phase signal; and a transmission line connected to an output terminal of the positive-phase circuit, wherein the transmission line rotates a phase of the positive-phase signal and reduces an intensity of the positive-phase signal. The other differential amplifier may be connected to a subsequent stage of the differential amplifier.
1 .- 9 . (canceled)
10 . A single-phase differential conversion circuit, comprising:
a pair of input terminals and a pair of output terminals and configured to output a positive-phase signal and a negative-phase signal corresponding to an input signal input into one of the pair of input terminals;
a first differential amplifier including a positive-phase circuit configured to processing a positive-phase signal and a negative-phase circuit configured to process a negative-phase signal; and
a first transmission line having a first end connected to an output terminal of the positive-phase circuit of the first differential amplifier,
wherein the first transmission line is configured to rotate a phase of the positive-phase signal and reduce an intensity of the positive-phase signal.
11 . The single-phase differential conversion circuit according to claim 10 , further comprising:
a second differential amplifier including a positive-phase circuit configured to process a positive-phase signal and a negative-phase circuit configured to process a negative-phase signal, the second differential amplifier arranged in a subsequent stage of the first differential amplifier,
wherein an input terminal of the positive-phase circuit of the second differential amplifier is connected to a second end of the first transmission line, and
wherein an input terminal of the negative-phase circuit of the second differential amplifier is connected to an output terminal of the negative-phase circuit of the first differential amplifier.
12 . The single-phase differential conversion circuit according to claim 11 further comprising a second transmission line connected to an output terminal of one of the positive-phase circuit and the negative-phase circuit of the second differential amplifier.
13 . The single-phase differential conversion circuit according to claim 11 , wherein each of the first differential amplifier and the second differential amplifier is a distribution amplifier.
14 . The single-phase differential conversion circuit according to claim 11 , wherein the first differential amplifier includes a tail current source.
15 . The single-phase differential conversion circuit according to claim 10 , further comprising:
a second differential amplifier including a positive-phase circuit configured to process a positive-phase signal and a negative-phase circuit configured to process a negative-phase signal, the second differential amplifier arranged in a preceding stage of the first differential amplifier, and
a second transmission line having a first end connected to an output terminal of the negative-phase circuit of the second differential amplifier,
wherein an output terminal of the positive-phase circuit of the second differential amplifier is connected to an input terminal of the positive-phase circuit of the first differential amplifier, and
wherein a second end of the second transmission line is connected to an input terminal of the negative-phase circuit of the first differential amplifier.
16 . The single-phase differential conversion circuit according to claim 15 , wherein each of the first differential amplifier and the second differential amplifier is a distribution amplifier.
17 . The single-phase differential conversion circuit according to claim 15 , wherein the first differential amplifier includes a tail current source.
18 . The single-phase differential conversion circuit according to claim 10 , wherein the first differential amplifier is a distribution amplifier.
19 . The single-phase differential conversion circuit according to claim 10 , wherein the first differential amplifier includes a tail current source.
20 . The single-phase differential conversion circuit according claim 10 , wherein
an input terminal of the positive-phase circuit and an input terminal of the negative-phase circuit of the first differential amplifier are connected to the respective one of the pair of input terminals, and
a second end of the first transmission line and an output terminal of the negative-phase circuit of the first differential amplifier are connected to the respective one of the pair of output terminals.
21 . A single-phase differential conversion circuit, comprising:
a differential amplifier including a positive-phase circuit configured to process a positive-phase signal and a negative-phase circuit configured to process a negative-phase signal; and
a compensation circuit,
wherein the compensation circuit includes, at an output terminal of the positive-phase circuit, a resistor, an inductor, and a capacitor,
wherein the resistor is connected in series with the inductor, and
wherein the capacitor is connected in parallel with the resistor and the inductor.
22 . The single-phase differential conversion circuit according to claim 21 , wherein the compensation circuit further includes a transmission line connected in series with the resistor and the inductor.
23 . The single-phase differential conversion circuit according to claim 22 , further comprising:
a detection circuit connected to a terminal on a side of the positive-phase circuit and a terminal on a side of the negative-phase circuit; and
a control circuit connected to an output of the detection circuit,
wherein the resistor is a variable resistor,
wherein the capacitor has a variable capacitance,
wherein the detection circuit is configured to detect an intensity difference and a phase difference between the positive-phase signal and the negative-phase signal, and
wherein the control circuit is configured to control resistance of the resistor such that the intensity difference is reduced, and control capacitance of the capacitor such that the phase difference is equal to or less than a predetermined value.
24 . The single-phase differential conversion circuit according to claim 21 , wherein the differential amplifier is a distribution amplifier.
25 . The single-phase differential conversion circuit according to claim 21 , wherein the differential amplifier includes a tail current source.
26 . The single-phase differential conversion circuit according to claim 21 , further comprising:
a detection circuit connected to a terminal on a side of the positive-phase circuit and a terminal on a side of the negative-phase circuit; and
a control circuit connected to an output of the detection circuit,
wherein the resistor is a variable resistor,
wherein the capacitor has a variable capacitance,
wherein the detection circuit is configured to detect an intensity difference and a phase difference between the positive-phase signal and the negative-phase signal, and, and
wherein the control circuit is configured to control resistance of the resistor such that the intensity difference is reduced, and control capacitance of the capacitor such that the phase difference is equal to or less than a predetermined value.