数字自动增益控制和模数转换数值抖动研究  

Study of digital automatic gain control and numerical jitter in analog-to-digital conversion

作　　者：柳良 陈泾浦 

机构地区：[1]深圳市桑达无线通信技术有限公司,广东深圳518028

出　　处：《现代电子技术》2013年第15期119-122,共4页Modern Electronics Technique

摘　　要：为了提高接收机的阻塞性能,设计一种数字式的自动增益控制电路,增益控制无需FPGA,DSP或微处理器通过查表的方式来实现,它通过直接使用模数转换的数字输出量来控制数字步进衰减器,这样降低了系统的响应时间和电路的复杂度。提出了一种利用低精度器件实现高精度数字AGC的方法,并针对子单元中模数转换的数值抖动设计了一种抖动消除电路,与其他方法相比,该设计电路实时性能更好。In order to improve the blocking performance of receivers, a digital automatic gain control （AGC） circuit was designed. The gain control does not rely on the FPGA, DSP or micro-processor in the form of look-up table. It controls the digital step attenuator by digital output quantity of the ADC directly to decrease the response time and the circuit complexity of the system. A method to achieve high-precision AGC by means of low-precision device is proposed. A novel circuitry to deal with the numerical jitter during analog-to-digital conversion in the subelement. The circuit has better real-time performance than other methods.

关 键 词：数字自动增益控制 模数转换 数值抖动 数字输出量 

分 类 号：TN702-34[电子电信—电路与系统]