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发明公开
CN106849883A 一种适用于RFID阅读器的信号放大频率补偿电路 无效 - 撤回

一种适用于RFID阅读器的信号放大频率补偿电路
摘要：
本发明公开了一种用于RFID阅读器的信号放大频率补偿电路，其中所述信号放大频率补偿电路包括：偏置电路、第一级运算放大电路和第二级运算放大电路；所述偏置电路用于为所述第一级运算放大电路和所述第二级运算放大电路工作提供与温无关的稳定电压；所述第一级运算放大电路用于接收待放大信号频率，对所述待放大信号频率进行第一次运算放大处理，获取第一次放大信号频率；所述第二级运算放大电路用于对第一次放大信号频率进行第二次运算放大处理，获取放大信号频率，将所述放大信号频率输出。在本发明实施例中，设计一种带电压控制电流源的电容倍增技术，提高了单位增益带宽，同时能减小失调电压和获得更大的摆率，让环路更加稳定可靠和精确。
摘要（英）：

The invention discloses a signal amplification frequency compensation circuit applicable to an RFID (Radio Frequency Identification) reader. The signal amplification frequency compensation circuit comprises a bias circuit, a first stage operational amplifier circuit and a second stage operational amplifier circuit; the bias circuit is used for providing a temperature independent stable voltage for the first stage operational amplifier circuit and the second stage operational amplifier circuit to work; the first stage operational amplifier circuit is used for receiving a signal frequency to be amplified, performing first operation amplification processing on the signal frequency to be amplified, and acquiring a first amplified signal frequency; and the second stage operational amplifier circuit is used for performing second operation amplification processing on the first amplified signal frequency, acquiring an amplified signal frequency, and outputting the amplified signal frequency. In the embodiment of the invention, a capacitance multiplication technology with a voltage-controlled current source is designed, which improves the unity gain bandwidth and meanwhile reduces the offset voltage and obtains a greater slew rate, so as to make a loop more stable, reliable and accurate.

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