Patent ID: 7653353

Claim:
A receiver IC associated with an external SAW device, comprising: an oscillating circuit, comprising: an inverter stage having an input terminal and an output terminal respectively coupled to one and the other ends of the external SAW device; a first capacitor coupled between the input terminal of the inverter stage and a ground; a second capacitor coupled between the output terminal of the inverter stage and the ground; and a resistor coupled between the input and output terminals of the inverter stage; a first amplifier receiving an RF signal; a mixer coupled to the first amplifier and the oscillating circuit and mixing the RF signal and an oscillating signal to generate a mixed signal; a filter coupled to the mixer and filtering the mixed signal to generate an IF signal; a second amplifier coupled to the filter and amplifying the IF signal to generate an amplified signal; and a received signal strength indicator (RSSI) coupled to the second amplifier and generating an output signal according to the amplified signal.