摘要:
A distortion compensator for reducing a level of a distortion component included in an output analog signal of an amplifier, includes: an A/D converter to convert the output analog signal of the amplifier into a digital output signal; a comparator to generate a distortion characteristic of the amplifier based on a digital input signal and the digital output signal; a rate controller to control a sampling rate of the A/D converter based on the digital input signal and the digital output signal; a predistorter to multiply the digital input signal and a compensation value for compensating the amplifier, the compensation value being calculated based on the digital input signal and the distortion characteristic of the amplifier; and a D/A converter to convert multiplication result of the predistorter into an analog input signal to input the analog input signal to the amplifier.
摘要:
A distortion compensator for reducing a level of a distortion component included in an output analog signal of an amplifier, includes: an A/D converter to convert the output analog signal of the amplifier into a digital output signal; a comparator to generate a distortion characteristic of the amplifier based on a digital input signal and the digital output signal; a rate controller to control a sampling rate of the A/D converter based on the digital input signal and the digital output signal; a predistorter to multiply the digital input signal and a compensation value for compensating the amplifier, the compensation value being calculated based on the digital input signal and the distortion characteristic of the amplifier; and a D/A converter to convert multiplication result of the predistorter into an analog input signal to input the analog input signal to the amplifier.
摘要:
According to an embodiment, a Doherty amplifier system has a first Doherty amplifier and a second Doherty amplifier. The first Doherty amplifier operates in a SISO communication mode and in a MIMO communication mode. The first Doherty amplifier comprises a first carrier amplifier and a first peak amplifier. The second Doherty amplifier operates in the MIMO communication mode but not operates in the SISO communication mode. The second Doherty amplifier comprises a second carrier amplifier and a second peak amplifier. A distance between the first carrier amplifier and the second carrier amplifier is less than any of a distance between any of the first carrier amplifier and the second peak amplifier and any of the first peak amplifier and the second peak amplifier. In the SISO communication mode, heat generated by the first Doherty amplifier is conducted to the second Doherty amplifier to warm up the second Doherty amplifier.
摘要:
According to an embodiment, a Doherty amplifier system has a first Doherty amplifier and a second Doherty amplifier. The first Doherty amplifier operates in a SISO communication mode and in a MIMO communication mode. The first Doherty amplifier comprises a first carrier amplifier and a first peak amplifier. The second Doherty amplifier operates in the MIMO communication mode but not operates in the SISO communication mode. The second Doherty amplifier comprises a second carrier amplifier and a second peak amplifier. A distance between the first carrier amplifier and the second carrier amplifier is less than any of a distance between any of the first carrier amplifier and the second peak amplifier and any of the first peak amplifier and the second peak amplifier. In the SISO communication mode, heat generated by the first Doherty amplifier is conducted to the second Doherty amplifier to warm up the second Doherty amplifier.
摘要:
A communicating apparatus includes: a local signal generator, an orthogonal modulator, an orthogonal demodulator, and two orthogonal error compensators. The local signal generator generates a first local signal and a second local signal. The orthogonal modulator modulates an input signal into a modulation signal by using the first local signal. The orthogonal demodulator demodulates the modulation signal into a demodulation signal by using the second local signal. Each of the two orthogonal error compensators corrects orthogonal modulation error generated in the orthogonal modulator and an orthogonal demodulation error generated in the orthogonal demodulator respectively. Set values to be set to the orthogonal error compensators are calculated based on (1) a phase difference between the first local signal and the second local signal, (2) the input signal and (3) the demodulation signal.
摘要:
This distortion compensator apparatus is a distortion compensator apparatus compensating nonlinearity of an amplifier and includes: a memory storing a compensation parameter used for correcting an input signal of the amplifier; a compensator correcting the input signal of the amplifier based on the compensation parameter; and an update controller updating the compensation parameter according to an operation state of the amplifier.
摘要:
A communicating apparatus includes: a local signal generator, an orthogonal modulator, an orthogonal demodulator, and two orthogonal error compensators. The local signal generator generates a first local signal and a second local signal. The orthogonal modulator modulates an input signal into a modulation signal by using the first local signal. The orthogonal demodulator demodulates the modulation signal into a demodulation signal by using the second local signal. Each of the two orthogonal error compensators corrects orthogonal modulation error generated in the orthogonal modulator and an orthogonal demodulation error generated in the orthogonal demodulator respectively. Set values to be set to the orthogonal error compensators are calculated based on (1) a phase difference between the first local signal and the second local signal, (2) the input signal and (3) the demodulation signal.
摘要:
This distortion compensator apparatus is a distortion compensator apparatus compensating nonlinearity of an amplifier and includes: a memory storing a compensation parameter used for correcting an input signal of the amplifier; a compensator correcting the input signal of the amplifier based on the compensation parameter; and an update controller updating the compensation parameter according to an operation state of the amplifier.
摘要:
A housings (20) has a lock arm (30) that engages a mating housing (10) when the housings (10, 20) are connected completely. A cover (40) is mounted slidably on the housing (20) and is pushed rearward as the housings (10, 20) are being connected. The cover (40) is biased forward by springs (45) that have front ends connected releasably to the cover (40). The springs (45) separate the housings (10, 20) if the connecting operation is stopped too soon. However the springs (45) are released from the cover (40) and expand to an unbiased state when the connection is complete.
摘要:
A connector has male and female housings (10, 20) that are fitted to each other. A pushable portion (58) is pushed by a pushing portion (14) of the male housing (10) so that a slider (51) resiliently compresses springs (50) to move the slider (51) back in the female housing (20) while accumulating biasing forces that urge the slider (51) forward. Guidable portions (61) of the slider (51) are engaged with guides (41) in a terminal accommodating portion (21), and the slider (51) is inclined about axes of supporting pins (60) at its rear. When the housings (10, 20) are connected properly and the slider (51) is inclined sufficiently, the pushable portion (58) disengages from the pushing portion (14), and the biasing forces of the springs (50) are released. As a result that the slider (51) is moved forward at an inclined posture.