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This paper proposes a transformer-based class-E CMOS power amplifier (PA) with shunt LC network. The conventional class-E PA circuits contains a series inductor and capacitor in the load network; the proposed class-E PA was realized only with a pair of inductor and capacitor connected in shunt at the output load network. The shunt network exhibits a higher quality factor Q with a finite value of shunt...
This paper presents a study of design optimization of voltage-controlled oscillators. The phase noise of LC-type oscillators is basically limited by quality factor of inductors. It is experimentally known that higher-Q inductors can be achieved at higher frequencies while oscillation frequency is limited by parasitic capacitances. In this paper, the minimum transistor size and degradation of quality...
In order to implement a fully-integrated on-chip CMOS power amplifier (PA) for RFID reader, inductors are implemented by bonding wires in the output stage of PA. Comparing with the on-chip inductors in CMOS process, the merit of the bondwire inductor is its high quality factor, leading a higher output power and power efficiency. Also the disadvantage of bondwire inductor is analysed. The fully on-chip...
A CMOS VCO circuit technique which enables a dynamic GHz-band switching has been described. To get wide band switching, it has been clarified analytically that keeping Q constant is important to configure the circuit. To meet this, an LC VCO circuit which can switch resonant capacitors and inductors simultaneously for switching the band has been suggested. To verify the effect, a dual band VCO circuit...
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