This paper presents a multistage amplifier for low-voltage applications (<2 V). The amplifier consists of simple (noncascode) low gain stages and is stabilized using a nested transconductance-capacitance compensation (NGCC) scheme. The resulting topology is similar to the well known nested Miller compensation (NMC) multistage amplifier, except that the proposed topology contains extra Gm feedfo...

A highly linear programmable-gain amplifier (PGA) is fabricated using a 0.35m CMOS technology. High linearity and constant wide bandwidth are achieved by using a high-gain amplifier with low input impedance and resistor-network feedback. The voltage gain is varied by digitally controlling the input switched resistors. The distortion of a switched resistor has been analyzed using the Volterra se...

Abstract A fiber Bragg grating (FBG) sensor system using a fiber ring laser with a hybrid amplifier is proposed and demonstrated. The hybrid amplifier comprises an erbium doped waveguide amplifier and a semiconductor optical amplifier. The experiment shows that such the hybrid amplifier has a high amplifier spontaneous emission power and gain spectrum. Moreover, this fiber ring laser can provid...

A new multistage multipath amplifier design technique is introduced that combines the formerly distinct phases of stage design and compensation. The result is an inherently stable n-stage amplifier whose gain-bandwidth product is not compromised as the number of stages is increased. The technique relies upon (n 1) systematic pole-zero cancellations to achieve a near first-order open-loop system...

This paper describes a simple, inexpensive transimpedance amplifier (TIA) suitable to convert the fast current pulses delivered by photomultiplier tube of night airglow photometer into the corresponding voltage. Design criteria for the transimpedance amplifier are carefully selected to include low input bias current, offset voltage and noise. The operation of the transimpedance amplifier and th...

Abstract: The LInear amplification using Nonlinear Components (LINC) technique is a wellknown power amplifier linearization method to reduce adjacent channel interference in a nonconstant envelope modulation system. Its major drawback is the inherited sensitivity to gain and phase imbalances between the two amplifier branches. In this paper two novel adaptive fulldigital base band methods are d...

In this work, the construction of a single stage L-band erbium-doped fiber amplifier which incorporates a short 5.1 m erbium doped fiber coil is described. Gain and noise figure measurements as a function of forward, backward and counter-propagating CW 1480 nm pumping schemes at different pump power levels are presented. Further, the Erbium Doped Fiber Amplifier (EDFA) power conversion efficien...

This paper presents a fully differential power amplifier (PA) with high efficiency and linearity. To improve the linearity, an optimum gate bias is applied for the cancellation of the nonlinear harmonics. The amplifier delivers a 6 dB of power gain. The signal noise distortion and total harmonic distortion of 55.68 dB and 0.144% has been shown. The compensation characteristics of the circuit ha...

Tower mounted amplifiers (TMA) serve to lower the system noise figure (NF) in cellular base-stations. For performance reasons, the TMA is located as near to the receiving aerial as practical and has to be connected to the rest of the radio at the tower’s base by a long run of coaxial cable. The parameters critical to TMA performance are low NF for reasons of optimizing coverage area, high gain ...

This paper presents a low-power linear variable gain amplifier (VGA). This VGA gains its low-power linear properties with the help of the local feedback auxiliary (LFA) amplifier. The core of this LFA amplifier is based on flipped voltage follower (FVF) circuit. This VGA provides the flexibility to tune its gain with dual tuning voltages. Gain range of 15 dB to 16 dB with maximum bandwidth of 2...