Abstract: A load inductor has first and second nodes. The first node couples to a first terminal of a first switch. A second terminal of the first switch couples to an output of a first low noise amplifier (LNA). The second node couples to a third terminal of a second switch. A fourth terminal of the second switch couples to an output of a second LNA. In response to receiving a single-ended signal at the first LNA, the first LNA is turned on, the first switch is closed, the second LNA is turned off, and the second switch is opened. In response to receiving the signal at the second LNA input, the first LNA is turned off, the first switch is opened, the second LNA is turned on, and the second switch is closed. The signal is transformed to a differential signal across the first and second inductor nodes.

Abstract: Techniques for low-pass filtering with high quality factor (Q). In an exemplary embodiment, an input current is coupled to the drain of a first transistor. The drain and the gate of the first transistor are coupled together by a resistor R1, and the drain is coupled to a reference voltage by a first capacitor C1. The gate is coupled to a reference voltage by a second capacitor C2. The gate is further coupled to the gate of a second transistor, and an output current is coupled to the drain of the second transistor. In another exemplary embodiment, further passive elements may be coupled to generate an odd-order low-pass transfer characteristic. Multiple filters may be cascaded in series to synthesize a filter having arbitrary order.

Abstract: Techniques for low-pass filtering with high quality factor (Q). In an exemplary embodiment, an input current is coupled to the drain of a first transistor. The drain and the gate of the first transistor are coupled together by a resistor R1, and the drain is coupled to a reference voltage by a first capacitor C1. The gate is coupled to a reference voltage by a second capacitor C2. The gate is further coupled to the gate of a second transistor, and an output current is coupled to the drain of the second transistor. In another exemplary embodiment, further passive elements may be coupled to generate an odd-order low-pass transfer characteristic. Multiple filters may be cascaded in series to synthesize a filter having arbitrary order.