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This paper presents a new delta-sigma-based transmitter architecture with quantization noise reduction and coding efficiency enhancement for multi-mode wireless sensor network (WSN) applications. The proposed architecture utilizes a finite impulse response (FIR) filter embedded digital power amplifier (DPA) controlled by the output of a 1-bit second order low pass delta-sigma modulator (LPDSM) for...
This paper describes an effective way of relaxing the nonlinearity problem of the digitally-controlled oscillator (DCO) in the two-point modulator design. A separate coarse varactor array dedicated for the high-pass modulation significantly simplifies the nonlinearity calibration of the DCO with a few-bit control. In addition, a finite-impulse response (FIR) filter is designed for the multi-bit high-pass...
This paper presents a ΔΣ modulated digital power amplifier (DPA) with a finite-impulse response (FIR) filter for wireless body area network (WBAN) applications. The proposed DPA utilizes a 1-bit second-order ΔΣ modulator to avoid nonlinearity problem of the multi-level quantization and achieve better quantization noise performance than the first-order modulator. The time-interleaving operation inherently...
This paper presents a two-point modulator architecture which is immune to the nonlinear effect of the digitally-controlled oscillator (DCO). By utilizing a 1 bit ΔΣ modulation with embedded finite-impulse response (FIR) filtering the high-pass modulation path does not suffer from the DCO gain nonlinearity, thus requiring absolute gain calibration only. The digital FIR filter in the high-pass modulation...
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