A high-linearity and high-speed current-mode sampleand-hold circuit is designed and simulated using a 0.25μm CMOS technology. This circuit design is based on low voltage and it utilizes a fully differential circuit. Due to the use of only two switches the switch related noise has been reduced. Signal dependent -error is completely eliminated by a new zero voltage switching technique. The circui...

A 10-bit low power track-and-hold (T&H) circuit aimed for the front-end of a pipelined analog-to-digital (A/D) converter has been designed. The T&H is sampling at 80MS/s, has a 30MHz analog bandwidth and was designed in a 0.18μm CMOS process with a supply voltage of 1.8 Volt. A switched capacitor topology applying correlated double sampling is used for the T&H circuit and the amplifier is a fol...

An innovative vector-sum phase shifter with a full 360◦ variable phase-shift range is proposed and experimentally demonstrated in this paper. It employs an active balun and a very high-speed CMOS operational transconductance amplifier (OTA) integrator to generate the four quadrature basis vector signals. The fabricated chip operates in the 2–3 GHz, it exhibits an average insertion gain of 1.5 d...

This paper presents two schemes of high performance CMOS current mirror, one of them is used for operational transconductance amplifier (OTA) in analog VLSI systems. The linearity, output impedance, bandwidth and accuracy are the most parameters to determine the performance of the current mirror. Here a comparison of two architectures based on same architecture of the amplifier is presented. Th...

This paper deals with the design of low-power, highperformance, continuous-time filters. The proposed OTA architecture employs current-reuse differential difference amplifiers in order to produce more power efficient Gm-C filter solutions. To demonstrate this, a 6th order low-pass Butterworth filter was designed in 0.18 μm CMOS achieving a 65-MHz -3-dB frequency, an in-band input-referred third...

The paper presents current adder and subtractor circuits based on cascode current mirror with improved linearity and wide linear range. The proposed circuits can be used for analog signal processing applications such as amplifiers, operational transconductance amplifiers (OTA), Gm-C filters, etc. In the proposed circuits, cascode current mirror topology is employed to improve current mirroring ...

Exposed to strong cochannel/adjacent-channel interference, digital multiple-input–multiple-output (MIMO) receivers require high-dynamic-range analog-to-digital converters (ADCs). Hybrid beamforming featuring spatial filtering before the ADCs can adaptively mitigate interference in both analog and domains; hence relaxing required dynamic ranges of ADCs. This article demonstrates effectiveness hy...

A novel switched-capacitor integrator based programmable resolution analog to digital converter (ADC) architecture is proposed. The proposed hybrid ADC can be switched between successive approximation register (SAR) and delta-sigma modulator (DSM) mode in 8-bit 15-bit resolution. mathematical relationship showing the effect of mismatch capacitors on linearity derived. fully differential folded ...

A nonlinear parameterizable macromodel fo r CMOS Operational Transconductance Amplijiers (OTAs) is presented. The macromodel captures the DC, AC and large signal features of the transistor level original circuit, thus modeling accurately its time domain and nonlinear performance. The main contribution of this work is to account for the bias-dependent transconductance nonlinearities in the circu...