KR970055811A - Distortion Compensation Circuit and Method of Transmission Device - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Precompensation of the transmitter

2. The technical problem to be solved by the invention

The configuration for generating a distortion signal during pre-correction of the transmission device is composed of three path structures for generating a linear component, a fixed distortion component and an adjusting distortion component and an adjusting distortion component.

3. Summary of the Solution of the Invention

The stationary compensator circuit of the transmission device includes an input amplifier for amplifying the input signal to maintain a constant power, a power divider for distributing the power of the amplified input signal in three passes, and a linear component for passing a linear component in the distributed input signal. A fixed distortion generating path portion for generating a fixed distortion signal for canceling the fixed distortion component whose level does not change in the distributed input signal, and generating a pure third-order distortion component signal from the distributed input signal, An adjustable distortion generating path section for generating a distortion signal adjusted according to the output level, a power combiner for inputting and combining the signals processed by the three path sections, and an output amplifier for amplifying and outputting the combined signal at the same level as the input level. It consists of.

4. Important uses of the invention

The structure of the precorrection circuit and the control operation can be easily implemented by the three-pass structure of the distortion signal generator of the transmission device.

※ Selectivity: 3rd

Description

Distortion Compensation Circuit and Method of Transmission Device

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

8 shows a circuit of an entire transmitter for testing the characteristics of the distortion compensation circuit of the invention in a transmission device.

Claims (4)

A pre-corrector circuit of a transmission device, comprising: an input amplifier for amplifying an input signal to maintain a constant power, a power divider for distributing power of the amplified input signal in three passes, and a linear component of the divided input signal. A linear pad portion for passing, a fixed distortion generating path portion for generating a fixed distortion signal for canceling a fixed distortion component whose level does not change in the distributed input signal, and a signal of pure third order distortion component in the distributed input signal An adjustable distortion generating path section for generating a distortion signal adjusted according to the output level of the transmitter, a power combiner for inputting and combining the signals processed by the three path sections, and combining the combined signal with an input level. A precorrector circuit comprising an output amplifier for amplifying and outputting at a level. 2. The apparatus of claim 1, wherein the adjustable distortion generating path portion comprises a nonlinear circuit and a linear circuit having a phase difference of 180 degrees, a distortion generating portion for extracting a pure third order distortion component signal from the input signal, and the third term distortion Distortion phase-level adjustment unit for adjusting phase and level by the third order distortion signal of the signal transmitter and a distortion signal having a phase difference of 180 degrees, and a memory device for storing data measuring the amount of analog voltage required for distortion level control. And a distortion level control signal generator for converting data of the memory element designated by the automatic output control signal into a control voltage and generating the distortion level control signal, and the phase and the level adjusted by the distortion level control signal. A precorrection circuit comprising a distortion level adjusting unit for adjusting and outputting a third-order distortion signal level. A pre-corrector circuit of a transmission apparatus, comprising: an input amplifier for amplifying an input signal to maintain a constant power, a power divider for distributing power of the amplified input signal in three passes, and a linear component of the distributed input signal. A linear pass section that passes through and amplifies with a certain gain, and compensates the time delay generated in another pass by the amplified linear signal, and generates a third order distortion signal on the distributed input signal, and generates a phase and level of the third order distortion signal. A fixed distortion generating path portion for adjusting a fixed third order distortion signal having a phase difference of 180 degrees so as to cancel a fixed distortion component that does not change in level other than the output amplifier, Generates the signal of pure third order distortion component and generates the distortion signal with phase difference of 180 degrees by adjusting the level and phase A fixed distortion generating path unit for adjusting the distortion signal of the transmitter to the output level of each transmitter to adjust the distortion signal of the third order term; a power combiner for inputting and combining the signals processed by the three path units; An output amplifier for amplifying and outputting the combined signal to the same level as an input level, and a portion of the output amplified signal is distributed to detect power for automatic level control, and then an automatic control loop is formed to form a gain control signal of the input amplifier. A precorrection circuit comprising an automatic level control unit applied to the circuit. A precorrection method of a transmitter, the method comprising: amplifying an input signal to maintain a constant power, distributing the power of the amplified input signal in a first pass through a third pass, and distributing it in the first pass Passing a linear component in the input signal, generating a fixed distortion signal for canceling a fixed distortion component whose level does not change in the input signal distributed in the second path, and input distributed in the third path. Generating a distortion signal adjusted to an output level of a transmitter by generating a pure third-order distortion component signal from the signal, and power-combining the processed signals via the first pass through the third pass; Amplifying and outputting the combined signal to the same level as an input level, and automatically adjusting the level of the input signal by detecting power of the output signal. A precorrection method characterized by loosening. ※ Note: The disclosure is based on the initial application.