High precision continuous time gmC BPF (Band Pass Filter) tuning. A novel approach is presented by which a continuous time signal serves as a BPF control voltage for tuning of a BPF within a communication device (e.g., transceiver or receiver). A PLL (Phase Locked Loop) tunes the center frequency of the BPF using this continuous time signal, and the PLL oscillates at the center frequency of the BPF. The BPF is implemented as a gmC (transconductance-capacitance) filter, and the PLL is implemented using a number of gm (transconductance) cells as well. The PLL's gm cells and the BPF's gm cells are substantially identical in form. All of these gm cells are operated within their respective linear regions. This similarity of gm cells within the PLL and the BPF provide for substantial immunity to environmental perturbations including temperature and humidity changes as well as fluctuations of power supply voltages.
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机译：高精度连续时间g m C BPF（带通滤波器）调谐。提出了一种新颖的方法，通过该方法，连续的时间信号用作BPF控制电压，用于调节通信设备（例如，收发器或接收器）内的BPF。 PLL（锁相环）使用此连续时间信号调谐BPF的中心频率，并且PLL以BPF的中心频率振荡。 BPF被实现为g m C（跨导电容）滤波器，并且PLL也使用了多个g m （跨导）单元实现。 PLL的g m 单元和BPF的g m 单元在形式上基本相同。所有这些g m 单元在它们各自的线性区域内操作。 PLL和BPF中的g m 单元的这种相似性为环境扰动提供了很大的抵抗力，这些环境扰动包括温度和湿度的变化以及电源电压的波动。
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