approved: Andreas Weisshaar In cellular telephones, RF power amplifiers consume a significant part of the total phone current. Reducing the average PA current will extend battery life. In GSM systems the handset is commanded by the base station to transmit at power levels lower than full power much of the time. A Doherty amplifier can be used to improve efficiency at these lower power levels, p...

In this paper we have describes the design of current mode instrumentation amplifier (CMIA) for bio-signal Acquisition system. The current mode instrumentation amplifier technology is based on voltage mode operational amplifier (op amp) power supply current sensing technique. There are two design challenges of this topology. First one is the Op amp mismatch and second is precise current mirrors...

In this paper, a high performance current-mode instrumentation amplifier has been proposed for low noise, low power, high CMRR and adjustable gain with an external resistor for various biomedical signal processing. The portable biomedical instrumentation has become an important part of diagnostic and treatment instrumentation, including telemedicine applications. The low voltage and low-power d...

Cost of Doing Business Abroad (CDBA) is an important construct in International Business. The variety of causes leading to the CDBA has been the subject of and many scholars’ examinations. Extending CDBA to an institutional level, we develop a new perspective on the CDBA by incorporating institutional misalignment between the home and the host country as a cause of CDBA. We propose that institu...

In recent time, the demand for Darlington pair amplifier for high data rate communication system has been appreciated and highlighted. The application of Darlington pair amplifier is supported in a condition, where requirement of high gain at a low frequency is applicable. Recently, Darlington pair amplifier has been testified with high gain bandwidth product for current applications. If we nee...

The Balanced Differential Amplifiers play a most important role as basic building block in instrumentation amplifier circuit. One of the characteristic of a differential amplifier, the common mode rejection ratio (CMRR) is most important. The active load used for balanced differential amplifier is going to affect differential gain, thus CMRR of the circuit. The active load used can be a diode c...

Abstract— This paper proposes a procedure for converting a class of Op Amp-, FTFN-, CCand CFAbased voltage mode circuits to corresponding current mode circuits without requiring any additional circuit elements and finally from Op Amp-based voltage mode circuits to any of the FTFN, CC and CFA current mode circuits. The latter circuits perform better at high frequency than the former ones. The va...

This paper presents a current-mode (CM) second-order filter, employing one so-called “Z Copy – Current Differencing Transconductance Amplifier” (ZC-CDTA), two grounded capacitors, and one virtually grounded resistor. The filter provides two current outputs of low-pass (LP) and band-pass (BP) types for driving independent loads, and one high-pass (HP) current output, flowing through one of the w...

A new OTA-based logarithmic-control variable gain current amplifier (LCCA) is presented. It consists of two Operational Transconductance Amplifier (OTA) and two PMOS transistors biased in weak inversion region. The circuit operates from 0.6V DC power supply and consumes 0.6 μW. The linear-dB controllable output range is 43 dB with maximum error less than 0.5dB. The functionality of the proposed...

a digital look-up table adaptive predistortion technique using a six-port receiver for power amplifier linearization is presented. the system is designed in ka-band for a dvb-s2 satellite link. we use a six-port receiver at the linearizationloop in place of classic heterodyne receivers. the six-port receiver is implemented by the use of passive microwavecircuits and detector diodes. this approa...