Traditional bandgap based current references have restricted temperature operating range due to the limited input common mode range of the feedback amplifier. This paper introduces a modified bandgap current reference that overcomes this limitation by placing a natural device (V, -0V) level shift stage between the amplifier and the bandgap. The circuit has been fabricated in a 0.25-pm CMOS proc...

A 1.5-GHz low noise amplifier (LNA), intended for use in a global positioning system (GPS) receiver, has been implemented in a standard 0.6m CMOS process. The amplifier provides a forward gain (S21) of 22 dB with a noise figure of only 3.5 dB while drawing 30 mW from a 1.5 V supply. In this paper, we present a detailed analysis of the LNA architecture, including a discussion on the effects of i...

In this paper we explore the symmetric autozeroing ultra low-voltage current mirror, differential pair and transconductance amplifier and present some applications. The ultralow transconductance amplifier has a current boost function and resembles switch-cap and auto-zero circuits. The current boost technique have been used to implement ultra-low voltage digital logic. The simulated data presen...

Three 12 bit, 40 MS/s pipelined analog-to-digital-converters (ADCs) are developed in 0.35μm CMOS process with 3.3V single power supply. The proposed ADCs architectures study the influence of the amplifier sharing technique in the power consumption and the main performances in the pipeline ADCs. Simulations results with extracted netlists are provided and show that the amplifier sharing techniqu...

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...

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 ...

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...

This work describes the design and integration of a lock-in amplifier with a terahertz detector array. Research in the terahertz region, which lies between the microwave and infrared portion of the electromagnetic spectrum, has been on the rise due to its potential applications as a biologically-safe replacement for X-Ray imaging and other non-invasive applications such as spectroscopy. Cryogen...

A current reused low-noise amplifier (LNA) with gain compensated to extend the bandwidth and is designed for ultra-wideband (UWB) wireless receiver. The design consists of two cascode common-source amplifier and an output buffer which is implemented in 0.18um RF CMOS process. The LNA gives 13.1dB gain; 9.1GHz 3dB bandwidth (3.1-12.2GHz) while consuming 13.9mW through a 1.8V supply. Over the 3.1...

In this paper we present low-power 77-GHz power amplifier (PA) for the long range automotive radar. The proposed amplifier is designed using TSMC 0.13-μm RF CMOS (fT/fmax=120/140 GHz) technology, and it is powered by a 1.5V supply. To reduce power dissipation, we consider bias voltage, transistor size optimization, matchings and layout optimization. To improve power gain of the amplifier, it ha...