This paper presents the design of high gain and low power fully differential Operational Transconductance Amplifier(OTA). Both the main conventional OTA and the boosting amplifiers are fully differential folded cascode.To increase the open-loop gain of the main OTA two auxiliary operational amplifiers(op-amps) are used . These auxiliary op-amps are fully differential folded cascode op-amps with...

The implementation of currentfeedback op-amps (CFB op-amps) relies on the use of a semiconductor process with complementary device structures for class AB operation of the input and output stages. Thus, CMOS technology is an obvious candidate. However, commercial CFB opamps are all realized in bipolar processes. In this paper we identify some of the problems related to the application of CMOS t...

This paper describes a CMOS analog baseband circuits for directconversion receiver of5GHz IEEE 802.11a. The analog baseband consists of I/Q signal paths which have channel selection filter, programmable gain amplifier (PGA). An active-RC channel selection filter for WLAN is described whose cut-off frequency is tunable from 6MHz to 20MHz. For high linearity, the PGA is constructed with op-amp an...

This paper presents a novel 1.8 V digital-to-analog converter (DAC) which is designed to operate at DC for a wide variety of circuit calibration techniques. To achieve 10-bit performance at 1.8 V, an ultra high gain op-amp is introduced for servoing. In order to minimize area consumption while maximizing performance, a segmented plus binary plus R-2R architecture is used. The DAC was designed i...

A new approach for CMOS op-amp circuit synthesis has proposed here. The approach is based on the observation that the rst order behavior of a MOS transistor in the saturation region is such that the cost and the constraint functions for this optimization problem can be modeled as convex functions. Second order e ects are then handled by formulating the problem as one of solving a sequence of co...

In this paper a new method for determining the component values and transistor dimensions for CMOS operational amplifiers (Op-Amps) is presented. As a wide variety of design objectives and constraints are Posynomial function of the design variables, the Optimization is done by Geometric Programming. As a consequence we can efficiently determine globally optimal trade-offs among competing perfor...

An 8th-order continuous-time (CT) bandpass delta-sigma (AZ) modulator has been designed and simulated in a 65 nm CMOS process. This modulator achieves in simulation 25 MHz signal bandwidth at 250 MHz center frequency with a signalto-noise ratio (SNR) of 75.5 dB. The modulator samples at 1 GS/s while consuming 319 mW. On the system level, the feedback topology secures stability for the 8th-order...

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...

This paper describes the design of Current Mode Instrumentation Amplifier (CMIA) for ECG signal Acquisition system. The CMIA topology is based on voltage mode operational amplifier (op-amp) power supply current sensing technique. Op amp mismatch and precise current mirrors are two design challenges of this topology. High Common Mode Rejection Ratio (CMRR) and Power Supply Rejection Ratio PSRR i...