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A fully integrated reconfigurable transceiver (TRX) in 180nm CMOS for 750-960MHz narrowband applications is presented. The low-cost TRX consists of a low-IF receiver with 180 kHz signal bandwidth, a digital polar transmitter with 3.75 kHz signal bandwidth and a fractional-N frequency synthesizer. The receiver features a passive current mode mixer to improve(More)
A 1.5-1.9GHz phase-locked loop (PLL) frequency synthesizer with automatic frequency calibration (AFC) and third-order Σ-Δ modulator for Sub-GHz wireless transceiver is presented. A LC VCO ranging from 1.5GHz to 1.9GHze is integrated on this chip to meet multiple protocols. The voltage controlled oscillator is designed with modified digital(More)
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