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The particle size of fly ash has influenced the physical and mechanical properties of geopolymers. Fly ash completely was ground to different pre-decided sizes, sieve sizes 180 μm, 90 μm and 45 μm (80 mesh, 170 mesh, 325 mesh) for formulation of geopolymer paste, and two activators were used: 8(M) NaOH and 1:1 mixture of NaOH and Na2SiO3. The heat evolution increased with increasing fineness of fly...
This paper presents a widely tunable balanced-to-unbalanced (balun) bandpass filter (BPF). The proposed balun uses two 2-port N-path BPFs with embedded quadrature phase shifting to achieve the single-ended to differential conversion. Analytical expressions for the in-band (IB) differential to single-ended (DS) and single-ended to differential (SD) voltage gains are derived and validated. A prototype...
This paper presents a transformer-less duplexer based on 2-port N-path bandpass filters (BPFs). The proposed duplexer consists of two quarter-wavelength transmission lines, and an N-path balun BPF which provides an out-of-band (OOB) blocker support for the receiver. A 0.45–0.65 GHz duplexer is implemented in a CMOS 65 nm technology. The duplexer occupies an active area of ≈ 0.7 mm2. In post-layout...
This paper presents an alternative approach to design reconfigurable mixed signal distributed arithmetic (DA) based finite impulse response (FIR) filter. The proposed architecture is based on the use of normal CMOS transistor for various computational blocks involved in the filter design. To maintain the reconfigurability, an electrically erasable programmable read only memory (EEPROM) based potentiometer...
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