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本文根据PCM 30/32路再生中继器自动均衡的原理及实践。设计一种可实现的自动均衡的新电路,其特点是:1)能满足再生中继器主要技术指标,单个中继器模拟的正弦波串话富余度≤14dB,误码率≤10_(-8)。2)没有采用传统的线路补偿网络,简化了电路。3)电路稳定性好。在-5℃到+45℃的范围内。自动均衡放大器的频率增益特性曲线的变化≤1dB。 本文详细讨论了新电路的两个主要部分,即固定均衡放大器和自动增益控制电路,并对均衡过的脉冲波形进行频域上及时域上的分析。
This paper is based on PCM 30/32 regenerative repeater automatic equalization principle and practice. Design a new circuit that can achieve the automatic equalization, which is characterized by: 1) to meet the main technical indicators of regenerative repeaters, a single repeater simulation of sine wave crosstalk redundancy ≤ 14dB, bit error rate ≤ 10 (- 8). 2) did not use the traditional line compensation network, simplifying the circuit. 3) good circuit stability. In the range of -5 ° C to + 45 ° C. Automatic equalization amplifier frequency gain curve changes ≤ 1dB. This article discusses in detail the two main parts of the new circuit, namely the fixed equalization amplifier and the automatic gain control circuit, and analyzes the equalized pulse waveform in the frequency and time domain.