用于北斗二代/GPS接收机的低功耗自动增益控制策略(英文)

A Low-Power AGC for BD-Ⅱ/GPS Receiver

提出一种用于北斗二代/GPS兼容系统的自动增益控制策略,并采用数模混合的结构实现55 dB增益控制范围及简单的反馈控制环路。此策略通过复用模数转换器的采样结果,自动调整电压控制增益放大器和数控增益放大器的增益。与传统自动增益放大器相比较,无需功率检测器或者检波器,大大降低了功耗水平。此增益控制策略在台积电0.18?m工艺下进行验证。测试结果显示其建立时间小于1 ms,仅消耗2 mA功耗,符合在北斗二代和GPS系统对自动增益控制电路的指标要求。

A low-power automatic gain control （AGC） strategy for BD-II/GPS compatible satellite navigation receivers is proposed. The proposed mixed-signal AGC has 55 dB gain control range and a simplified control loop. By monitoring the ADC sampling result, the proposed AGC automatically controlvariable gain amplifier （VGA） and programmable gain amplifiers （PGA）. Compared with traditional counterpart, the proposed AGC strategy is more power-efficient, since it does not need a power detector or rectifier. The chip is fabricated in a TSMC 0.18 μm CMOS process and the measure results show that the settling time of AGC is within 1 ms, and it consumes only 2 mA current at 1.8 V power supply.