4.2 Receiver

The Low-Noise Amplifier (LNA) operates in a TR-combined mode for a single port application. It saves a pin on the package without having an external TX/RX switch.

The ADC is used to sample the analog input signal and convert it into a digital signal for demodulator analysis. A channel filter is integrated into the receiver channel before the ADC to reduce the external component count and increase the anti-interference capability.

The image rejection filter is used to reject the image frequency for the low-IF architecture, and it also intended to reduce the external Band Pass Filter (BPF) component for a super heterodyne architecture.

The Received Signal Strength Indicator (RSSI) signal feedback to the processor is used to control the RF output power to make a good trade-off for effective distance and current consumption.