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This work presents a 2nd-order, multi-bit Continuous-time Quadrature Bandpass Delta-Sigma (CT QBP ΔΣ) modulator with a Pseudo-random Quadrature Mismatch Shaping (PQMS) algorithm for GSM-EDGE/Bluetooth Low-IF receiver. CT QBP ΔΣ modulator is vulnerable to mismatches between its in-phase and quadrature (I/Q) paths that can dramatically degrade its Signal to Noise-plus-Distortion Ratio (SNDR) and image-rejection...
This paper presents a delta-sigma pulse-width digitizer (ΔΣ-PWD) architecture designed for a super-regenerative receiver (SR-RX) operated at the 400-MHz Medical Implantable Communications Service (MICS) band. The ΔΣ-PWD employs the operation principle of a ΔΣ modulator to convert the pulse-width (PW) value into digital domain and achieve fine resolution, which allows the SR-RX to support the 2-ASK/4-ASK...
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