In many applications such as TDMA cellular telephone, OFDM, Bluetooth, Satellite communication etc. QPSK digital modulation technique is used due to its higher bandwidth efficiency, higher noise immunity and simpler circuit. Simpler circuit is having lower cost, smaller size and lower power dissipation. In this paper a new circuit for QPSK modulator is designed which improves the area of the ci...

In this paper an optimized hardware co-simulation approach is presented to design & implement GSM based digital down convertor for Software Defined Radios. The proposed DDC is implemented using optimal equiripple technique to reduce the resource requirement. A computationally efficient polyphase decomposition structure is used to improve the hardware complexity of the overall design. The propos...

Nonlinear Dynamics is a very popular topic for researchers. The prior researchers already studied the nonlinear dynamics of current controlled DC-DC boost converter. The power factor corrected boost regulator is a circuit which is designed especially as input power factor can maintain unity. Firstly, we derive the state equations of this switching circuit. The circuit is numerically simulated b...

In this study, two types of multilevel convertors, cascaded multilevel inverter with separate DC sources and diode clamped multilevel inverter with common DC source are modeled and compared in the case of feeding of an induction motor. Here, SHEPWM technique is used as the switching strategy. Also a new variable torque feedback control on modulation index is presented, to preserve the induction...

In the recent scenario of microelectronic industry, the reversible logic is considered as the burgeonic technology for digital circuit designing. It deals with the aim to generate digital circuits with zero power loss characteristics. Optical computing, Nanotechnology, Low power CMOS design and Digital Signal Processing (DSP) processors are leading areas of development with the concept of rever...

Day by day increasingly, new types of wireless devices are being introduced. These devices have access to the internet. Thus the spectral efficiency of the current network needed to be improved. For this OFDM signals are introduced. In this paper, we propose to discuss the technique to reduce the peak to average power ratio for an OFDM signal, so that it can be used further. Also different tech...