Delay line
A delay line and delay circuit technology, applied in the field of delay lines, can solve the problems of increasing the productivity of the feedforward circuit of the distortion compensation amplifier, and achieve the effects of reducing absolute delay time deviation, simple structure, and widening passband
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example 1
[0067] An inventive example of the delay line 10A according to the first embodiment (delay line 100A according to the first inventive example) will be described below with reference to FIGS. 4-7.
[0068] In the delay line 100A according to the first inventive example, the second delay circuit 14 includes a hybrid coupler 26 , a first reactance unit 28A, and a second reactance unit 28B similar in characteristics to those described in FIG. 2 . The first reactance unit 28A includes a series connection circuit composed of a first capacitive element 32a and a first resonator 34a. The second reactance unit 28B includes a series connection circuit composed of a second capacitive element 32b and a second resonator 34b.
[0069] The first delay circuit 12 includes a bandpass filter 44 including a plurality of λ / 4 resonators (first to fourth resonators 42a) arranged between the first input terminal 16 and the output terminal 18. to 42d). In the bandpass filter 44, the first input ter...
example 2
[0080] An inventive example of the delay line 10B according to the second embodiment (delay line 100B according to the second inventive example) will be described below with reference to FIGS. 10-13.
[0081] The delay line 100B according to the second inventive example has basically the same structure as the delay line 100A according to the first inventive example. However, as shown in FIG. 10 , the first reactance unit 28A and the second reactance unit 28B of the second delay circuit 14 have the following differences:
[0082]The first reactance unit 28A includes a series connection circuit composed of a first capacitor 50a, a first varactor diode 52a, and a first resonator 34a. The second reactance unit 28B includes a series connection circuit composed of a second capacitor 50b, a second varactor diode 52b, and a second resonator 34b.
[0083] In the first reactance unit 28A, one end of the first capacitor 50a is connected to the first output terminal 22a, and the other en...
example 3
[0093] Another inventive example of the delay line 10B according to the second embodiment (delay line 100C according to the third inventive example) will be described below with reference to FIGS. 14-17.
[0094] The delay line 100C according to the third inventive example has basically the same structure as the delay line 100B according to the second inventive example. However, as shown in FIG. 14, the first delay circuit 12 has the following differences:
[0095] In the first delay circuit 12, the first input terminal 16 and the first resonator 42a adjacent to the first input terminal 16 are connected to each other through the capacitor C11, and the first resonator 42a and the first resonator 42a adjacent to the first input terminal 42a are connected to each other through the capacitor C11. The two resonators 42b are connected to each other through a capacitor C12. The second resonator 42b and the third resonator 42c adjacent to the second resonator 42b are connected to eac...
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