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A receiver analog baseband (ABB) chain for an integrated ZigBee (IEEE 802.15.4) transceiver is presented in this paper. The ABB is composed by a 3rd-order complex band-pass filter (BPF), a variable gain amplifier (VGA) and an analog-to-digital converter (ADC). The circuit topology of each building block has been designed complying with the IEEE 802.15.4 standard as well as featuring low power consumption...
A 5GHz LC VCO (voltage-controlled oscillator) with automatic amplitude control (AAC) and automatic frequency-band selection (AFBS) for 2.4GHz ZigBee transceivers is presented. Instead of continuous feedback loop, an alternative amplitude calibration scheme is proposed in this paper to alleviate the deficiencies inherent in the conventional approach. It helps to keep the VCO at optimum amplitude to...
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