KR950022305A - Method and Circuit for Improving Horn Modulation Distortion in Digital Cellular Systems - Google Patents

Abstract

A method for improving horn modulation distortion of a digital cell system, wherein the first and second signals are in phase with the input signal (A∠0 °).

Separating and separating the first signal

Amplifies and partially outputs the amplified carrier and the horn modulated distortion carrier in phase, and the divided second signal

Delay. First signal

Delays the delayed signal through the amplifier and the coupler state, reduces the carrier effect and scales it according to the purpose, and inverts the phase of the signal so that it remains exactly 180 ° with the signal appearing in the combining to When combined, the horn modulated distortion carrier signal is detected from the carrier signal including the horn modulated distortion carrier signal by 180 ° phase difference by a signal output through the attenuator and phase shift, and the magnitude of the attenuated output signal is adjusted. And phase shift so as to be synchronized for cancellation of the horn modulated distortion carrier when combined, and amplify by increasing to consider removing the input IMD from the final output by the horn modulated distortion carrier signal of the attenuated and phase shifted output, Modulation distortion carriers can generate IMDs that can In this case, a signal including a carrier signal and an IMD in reverse phase is generated by the increment by combining with the amplified signal in consideration of the Kensling. The IMD improvement effect can be increased by outputting a carrier signal that is canceled by the difference and has no intermodulation distortion carrier, but uses a transistor having the same die structure as the main amplifier and the amplifier.

Description

Method and Circuit for Improving Horn Modulation Distortion in Digital Cellular Systems

Since this is an open matter, no full text was included.

(A)-(C) is a conventional circuit diagram.

2 is a circuit diagram according to the present invention.

3 is an output characteristic diagram of FIG.

Claims (2)

In the horn modulation distortion improvement circuit of the digital cell system, the first and second signals are in phase with the input signal (A∠0 °) of the input terminal 11. @@ The splitter 201 and the first signal separated from the splitter 201 @@ A second signal of the first combiner 205 and the divider 201 that outputs some power in phase with the carrier amplifier and the horn modulated distortion carrier that are the outputs of the drive amplifier 202 and the drive amplifier 202. @@ Delay. First signal @@ The first delay unit 203 delays by the delay while passing through the driver amplifier 202 and the first combiner 205, and the effect of the anti-saddle wave from the signals output from the first delay unit 203 A first attenuator and phase shifter 204 for reducing the amplitude, resizing according to the purpose, and shifting the phase of the signal to be maintained at exactly 180 ° with the signal partially extracted from the first combiner 205, and the first combiner ( An attenuator 206 for detecting a horn modulated distortion carrier signal along a 180 [deg.] Phase difference by an output of the first attenuator and phase shifter 204 from a carrier signal containing the horn modulated distortion carrier signal of 205; A second attenuator and phase shifter 208 for adjusting the magnitude of the output signal of 206 and shifting the phase so as to be synchronized for cancellation of the horn modulated distortion carrier when combined; an output of the second attenuator and phase shifter 208 Horn modulation After the input IMD is removed from the final output by the distortion carrier signal, the amplifier 210 increases and amplifies as much as possible to remove the IMD generated at the output side, and the first combiner 206, the second attenuator, and the phase shifter 208. ), A carrier signal including a second delay unit 207 delayed by a signal while passing through the amplifier unit 210, a horn-modulated distortion carrier of the second delay unit 207, and the amplifier 210 A second combiner 209 for generating a signal including a carrier signal and an IMD reversed by the increment by combining with an amplified signal considering canceling in consideration of an IMD that may be generated at the output stage itself, and the second combiner Amplifying the output of 209 by the increment and amplifying a carrier including an IMD, which is canceled by the difference between the IMD generated in the carrier signal itself, and outputs a carrier signal unit 211 which outputs a carrier signal without intermodulation distortion carrier. Characterized by removing intermodulation distortion of the digital cellular system of gaeseonhoe. A method for improving horn modulation distortion of a digital cell system, wherein the first and second signals are in phase with the input signal (A∠0 °). @@ Separating and separating the first signal @@ Amplifies and partially outputs the amplified carrier and the horn modulated distortion carrier in phase, and the divided second signal @@ Delay. First signal @@ Delays the delayed signal through the amplifier and the coupler state, reduces the carrier effect and scales it according to the purpose, and inverts the phase of the signal so that it remains exactly 180 ° with the signal appearing in the combining to When combined, the horn modulated distortion carrier signal is detected from the carrier signal including the horn modulated distortion carrier signal by 180 ° phase difference by a signal output through the attenuator and phase shift, and the magnitude of the attenuated output signal is adjusted. Phase shift to be synchronized for cancellation of the horn modulated distortion carrier upon combining, and to remove an IMD that would occur on the output side itself after removing the input IMD at the final output by the horn modulated distortion carrier signal of the attenuated and phase shifted output. Increase and amplify as much as considered, and the horn modulated distortion carrier Amplified by the amplifier and canceled by the difference between the IMD by the carriers input to the main amplifier, the carrier upson carrier signal without the horn-modulated distortion carrier is output. A method of improving intermodulation distortion reduction in a digital cellular system, characterized by an effective improvement of ※ Note: The disclosure is based on the initial application.