In this letter, a 2.4-GHz quadrature local oscillator (LO) buffer insensitive to frequency-dependent loads is presented for Bluetooth low energy (BLE) applications. An LC tank is used as a load in the proposed buffer to provide a sufficient voltage gain and large voltage swing at the operating frequencies of BLE. Furthermore, the effect of the frequency-dependent impedance of the LC tank on the gain and phase mismatches is reduced by adding compensating transistors. The proposed buffer can provide accurate quadrature signals without additional circuitry in the LO path, minimizing the current consumption of the receiver. It is implemented in 65-nm CMOS technology. It achieved a voltage gain of 5.6 dB, a gain mismatch less than 0.3 dB, a phase mismatch less than 1.1°, and an output ${P} _{{1dB}}$ of 3 dBm. It draws an average current of 3.8 mA from a supply voltage of 0.8 V. The active die area is 0.55 mm².

中文翻译：

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一个 2.4GHz 正交本地振荡器缓冲器，对低功耗蓝牙应用的频率相关负载不敏感

在这封信中，为蓝牙低功耗 (BLE) 应用提供了一种对频率相关负载不敏感的 2.4GHz 正交本地振荡器 (LO) 缓冲器。一个液晶显示器tank 用作建议缓冲器中的负载，以在 BLE 的工作频率下提供足够的电压增益和大电压摆幅。此外，频率相关阻抗的影响液晶显示器通过添加补偿晶体管，可以减少增益和相位失配的谐振。建议的缓冲器可以提供准确的正交信号，而无需在 LO 路径中添加额外电路，从而最大限度地减少接收器的电流消耗。它采用 65 纳米 CMOS 技术实现。它实现了 5.6 dB 的电压增益、小于 0.3 dB 的增益失配、小于 1.1° 的相位失配以及输出 ${P} _{{1dB}}$ 3 dBm。它从 0.8 V 的电源电压汲取 3.8 mA 的平均电流。有效芯片面积为 0.55 mm ²。