AMIS-53050 Datasheet, PDF (20/107 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53050 Frequency Agile Transceiver
Data Sheet
5.2.1. Receiver Low Noise Amplifier (LNA)
The receiver input of the AMIS-53050 is a single-ended input and single-ended output device. The input is matched to 50Ω using an
external matching network, which provides a DC path to ground for biasing the receiver’s LNA. The output of the LNA is tuned to the
desired operating frequency using an external inductor along with an on-chip capacitor. The output inductor also provides the LNA with
a DC connection to the supply voltage. On-chip tuning capacitors are binary weighted and digitally controlled.
The value of the internal input capacitance has a range of 1.2 - 4pF. The corresponding range for the internal output capacitance is 0.3
- 0.9pF. The impedance of the receiver for three values of input coil inductance, with the input capacitance set to the middle of the
range (register set to 0X80), is shown in Figure 8. Here, the value of the output coil inductance is a function of the operating frequency,
and is shown in Figure 9.
Figure 8: RX Input Impedance
AMI Semiconductor – Jan. 07, M-20639-002
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