Wired CDMA interface with adaptivity for interconnect capacitances is designed to receive transmitted data even under a wide variety of connection topologies. The variable gain amplifier (VGA) is one of key circuit blocks to realize the adaptivity for interconnect capacitances. The system level numerical simulations derive the VGA specifications that the required VGA gain range is from 0.37 to ...

Differential cross-polarization modulation (DXPoM) wavelength conversion using a semiconductor optical amplifier has been proposed to outperform substantially traditional cross-polarization modulation (XPoM). This work presents analytical small-signal models of XPoM and DXPoM. The transfer function of DXPoM is used to elucidate the significant improvement in bandwidth and the relationships amon...

In this work, we present a fully differential transimpedance amplifier (TIA) with controllable transimpedance for use in RF overlay downstream communication systems. The transimpedance amplifier has been designed in a standard 180-nm CMOS technology and it is intended for 47 MHz to 870 MHz subcarrier multiplexed RF signals. It performs a 18 dBΩ transimpedance gain control range for extended opt...

In this study, an eight-channel wide-band intermediate frequency (IF) receiver with S-band input frequency, output of 200 MHz, and a signal bandwidth 160 MHz was developed. The performance measurement results the IF showed that fundamental second harmonic were involved in output. This caused by nonlinearity characteristics final stage amplifier. Therefore, amplifier changed to differential ampl...

Abstract A differential Low-noise Amplifier (DLNA) using 0.13 μm CMOS technology is presented. The amplifier is optimized for Bluetooth Receiver applications operating in the 2.4 2.5 GHz band. The inductive degeneration topology used in the DLNA provides low noise, high gain and a large IIP3. The differential LNA was added a cascade output stage to the Single-ended source degenerated stage. Sim...

Pulses from a broadband dye laser operating in many modes have been temporally smoothed by passing them through a strongly saturated dye amplifier in the presence of a strong, nonsaturable absorber. The standard nonlinear coupled partial differential equations based on the rate-equation approximation have been used to model the amplifier. Both analytic and numerical solutions for the equations ...

We successfully fabricate three-mode erbium doped fiber with a confined Er(3+) doped ring structure and experimentally characterize the amplifier performance with a view to mode-division multiplexed (MDM) transmission. The differential modal gain was effectively mitigated by controlling the relative thickness of the ring-doped layer in the active fiber and pump launch conditions. A detailed stu...

An optical receiver for 40 Gbit=s communication systems with 8274 V=W conversion gain and 950 mVp–p limiting differential output is reported. A back-to-back sensitivity of 9.4 dBm at a bit error rate of 10 12 was observed for a 2 1 pseudorandom binary sequence. The receiver incorporates an InP based pin diode, a transimpedance amplifier and a limiting amplifier. This is the largest conversion g...

Class AB differential amplifiers using composite BiCMOS and bipolar transistors are introduced. Their utilization for the implementation of low voltage (+-1.65V) operational amplifiers with high slew rate and rail to rail common mode input voltage range is discussed.

This paper presents a balanced receiver structure suitable for wireless infrared data communications. The receiver provides a fixed photodiode bias voltage with the use of a regulated cascode input stage. Together with an active feedback loop used to eliminate dc photocurrents, the receiver implements ac coupling without the need for matching capacitors. Differential sensing of the photodiode c...